Rough cold start then smooths out

3 runs rough at start then smooths out warm. Automotive Diagnostic Spe TL: Acura 2001TL, parked out doors in 10 degrees. 73’ 350 automatic. It just seems to happen when it wants to, not because of any set of confitions. Dec 10, 2014 · Dec 20, 2018. Second time same symptoms, only this time I quickly popped the hood and could Mar 13, 2014 · Also change your spark plugs, get a set of new ones and that would help the rough idle in the cold. Rough idle on cold start. May 15, 2012 · heztheone. I have a 97 F350 7. If the injector is dirty or you are dealing with a bad fuel injector, it will not give the extra fuel needed. When the car finally warms up the noise doesn’ completely go away but I don’t hear it as much. After the engine begins to warm up the idle increases and smooths out until operating temperature where it runs beautifully. I removed and cleaned the cold start valve, and ran a couple of cans of injector cleaner, no help. Is it a flex fuel truck? Sometimes the learned alcohol content is off (if it doesn't have a sensor) and can cause the rich codes you have. Feb 17, 2017 · The issue obviously affects RPM enough for the FENG to detect the change, and respond accordingly. Also a good additive such as REV-X and Archoil. then if you try to throttle up any. How do vacuum leaks happen? First, understanding engine vacuum and operation is required to grasp vacuum leaks. This happens due to several factors and indicates the malfunction of a car part. Two dealerships "can't find anything wrong" since it is not throwing a CEL. Then it wont start back up until the engine cools down. 7 usually the only time we have to replace injectors is when customers fill them up with gas or accidentally put exhaust fluid in the fuel tank. A dirty or a clogged fuel injector will not feed the engine with the required amount of fuel which will lead to a car that starts rough but eventually smooths out. Fires up just fine and idles good, but when I go to drive and shift, it's like it's misfiring or bogging down. 6 starts up but runs rough for 10 -20 seconds then smooths out. and then after about 1 min of running May 30, 2005 · 1983 - 2012 Ranger & B-Series - 98 starts up rough - smooths out in 10 secs - My 98 - 4. Jun 11, 2012 · I'm posting this question in TB because the problem hasn't been solved in other Buick forums. It almost feels like a slight missfire, but then goes away. It did the job but I’m now having hard start problems when cold. Oct 28, 2018 · Originally Posted by Charles Howard. Dec 17, 2008 · If so, the vanos is a likely cause. 2015 - 2020 Ford F150 - 2. Once truck is warm, it will start fine and run fine. No codes showing. Jan 1, 2009 · My 1990 300SL with 110k miles runs great, but when started cold, even in summer, it idles very rough for about 5 to 10 seconds then smooths out on its own and runs great. Could that have caused this? The Camshaft actuators were replaced under recall already. Truck has 126K total and an auto tranny. It idles fine after it's running, but the whole car shakes and it doesn't sound like it Dec 13, 2012 · 97 T100 156K 3. Oct 11, 2008 · everytime i start my 2002 f150 super crew w/ 5. Cold starts are no problem. Mar 7, 2017 · 2nd Gen : 2010-2017 Chevy Equinox. Oct 24, 2023 · A fuel system problem is the most common reason a car starts rough and smooths out. What you were told by your dealership about using synthetic instead holds truth. Views. 5mm, 12V only. 1529 posts · Joined 2009. Now that the weather has turned, the Jeep runs really rough when the motor is cold. 6L. i'm also having a rough idle at startup, the RPM sometimes plays all over the place for around 20 sec, but most of the time as soon as i start it up, it reaches 1100 RPM, drops to 900 RPM then goes back up to 1100 until it warms up. 1. I put a new Holley 4160 on my truck and during a cold-start the first 30 seconds it runs rough then smooths out and is fine. Feb 21, 2011 · 96 posts · Joined 2008. Once I drive off after 15mins it smooths out. 0 with 150K miles. I reasoned that the viscosity of the fuel got thinner after the injector warmed up and it essentially leaked into the Jan 7, 2013 · Engines need to run rich when cold, so the ECU dumps more fuel into the engine than is actually needed until it warms up, think of it as full choke when cold. Re-starts with hot engine are smooth. #1 · Feb 21, 2011. Once I get moving and give it some gas it smooth's out and runs fine at speed, but if I have to stop too soon it goes back to the rough idle. I am having issues during cold start. 9L. Like. The idle on cold starts is rough, gurgling, it almost stalls (and sometimes does) and the exhaust is unbearable until the engine Jul 31, 2012 · When engine is cold computer will run injectors rich, raise the idle and advance the timing. Comfort Group. Jun 20, 2011 · Not really, but it smells bad after the cat. Hey guys I have a 2000 F-350 7. My fuel trims at cold start are often completely out of whack (LTFT -9%, STFT +16% : net +7%), but once the engine is warmed up my idle is smooth and my ST+LT fuel trims balance out (LTFT -3. If not, then we'll eliminate that as the possible cause and move on. Jul 19, 2016 · Vehicle: 1981 280ZX N/A, Automatic Transmission, 46000 miles. Jun 11, 2022 · This will then result in a rough idle at a higher RPM. 2775 - is engine torque - probably due to misfires, so park this for now. 3L, after sitting over night have a hard start then runs rough for about a minute then smooths out. I bought this Deville 3 months ago with 113,000 miles and it ran great for the first 2 months. The drop in engine speed he's referring to occurs after warming up. Usually on the first start of the morning, the car would fire up and just start reving on its own. Mine had rough idle a while back but smoke was coming out of the engin and that was PCV aka CCV and i changed that and it's perefect now. When the engine is cold, it runs as smooth as glass, but when the engine starts to get warm, the idle is rough, as though it has a miss or a stumble. Apr 6, 2010 · I have a 1998 Jeep Wrangler that runs rough and backfires when first started–for about a mile or so, or about several minutes of driving, and then it is smooth and has good power and acceleration. 0s. I've replaced the PCV, had carbon cleaning done, RMS has been May 19, 2012 · 94 Blazer 4. Sep 24, 2010 · Hesitation and rough cold start fixed! My MCS has about 111K on it, and it has had two problems for awhile. The past month or so, the car has been having rough starts. I have the 2. Has 27,000 miles on it and since new, has had a slight miss when cold. Aug 20, 2018 · 7. Just recently did a tuneup with new plugs and wires, 10k miles ago. it doesn't matter if the engine is hot or cold. 3 PSD that i bought in Texas. It helps reduce stiction. Dec 22, 2016 · This is either a faulty EGR temp sensor or the EGR valve itself can't close all the way (causing a vacuum leak, therefore a rough idle). A little more history that may or may not be related- about 2 months ago I had engine Apr 28, 2012 · cold start (overnight) car fires up immediately upon first crank, then runs rough like it's running on 2 or 3 cylinders for about 30 seconds at the 1000-1250 range, then the idles smooths out and gradually drops down to the usual 700. No CEL, But my creade code reader got a codes P0171 P0174 ?? Very bad idle-sputtering in cold start, then after 2-3 minutes ECM compensates, warms up and runs great ?? Oct 21, 2016 · I recently purchased a 2008 canyon with the 3. Look through the data pids for the learned Nov 28, 2012 · Hard starts when cold are usually caused by fouled spark plugs, worn plug wires, or weak ignition coils. Fuel systems are not as effected by temperature changes as the ignition components. 1987 - 1996 F150 - 93 F150 4. If it does in fact run rough than smooths out after being warmed up. 3. This will fix your problem if its when you first start the truck and its cold out and it does a kinda "bucking" idle jump for 5-10 seconds, then settles in normal. I've changed the following after reading every thread i could Aug 30, 2019 · Fuel injectors are responsible for delivering fuel to the engine, and a dirty fuel injector can cause problems such as a rough idle. It started well and ran great cold, then ran rough at idle with a miss after warmed up. Doesn't do this when the engine is hot, only on the initial morning start up or during the day if the engine has sat a while. Feb 6, 2019 · Just this last couple of mornings my '15 3. Technique Tuning 80# tune. Revving the engine, or when the car is finally warm, makes the misfires go away. 5 Ecoboost. Gold plan 419 ext warranty. Two recommended mechanics unable to fix this. I have quite a few symptoms to help diagnose this, so please bear with me. It has around 12,000 miles on it and I don't know what type of fuel the prior owner used or if he used Techron Nov 13, 2013 · 153 posts · Joined 2013. Mar 14, 2017 · Last week I picked up an 04 RR with 73k on it. Seems as if not running on all cylinders at start up. basically first start of the day or whenever there is a long time duration between starts. i replaced the spark plugs and the pcv valve. 1 2. if that won't fix it then there could be other issues. Apr 1, 2009 · 6 posts · Joined 2009. 06 Forester 81k miles, had gasket done in August. One thing that does happen that I'm hoping may give some insight to someone is that if I let it go into limp mode, the idle smooths right out. After starting the motor, it will idle rough and acts like it wants to stall. it happens everytime i start my truck. It goes away when it goes down to 1000 RPM. I We would like to show you a description here but the site won’t allow us. I joined this group to post my solution and how I fixed this issue to help the next person troubleshoot. #1 · Nov 13, 2013. 5 l engine. Dirt, grime, and other contaminants can build up in the fuel system over time, leading to clogged or blocked fuel injectors. Starting immediately after the car will start & run fine. Bigphil555. The problem is sometimes it runs really rough and stumbles on startup but in a short while it smooths out and runs perfectly. May 17, 2021 · On a cold start (engine being off for 10+ hours), the car cranks, starts, then starts to shutter and shake and unless I give it gas, it will stall. Nov 1, 2021 · When I start up cold, or after sitting for a few hours, the engine starts fine and initilly idles fine, then about 3-4 seconds later, it will drop the idle to around 400rpm, where it stumbles, then quickly reacts and the rpms shoot up to 1100, then for the next 8 seconds or so, it will not drop down below 800rpm, as it hunts to find a happy Dec 2, 2014 · 3. 8. I think this started after I changed plugs at 155,000km. We bought it with 20k mile on it and it just turned over 54k. The problem is worse the colder it gets. I put it back together and tried starting it and there was no rough idle. If I drop it into gear it stays rough as I back out of the driveway. The 300 series of codes is, as you say, a generic misfire, then misfire on 1 and 3. It has a very raspy exhaust tone when it first starts and idles at about 1300 RPMs for about 20 seconds and then the idle drops to 1000 rpms and stays there for about 10 seconds. e - the car has sat overnight). 3 powerstroke hard cold start. Once underway it runs fine and otherwise runs/idles very smooth for the rest of the day. After several seconds (about when the engine would normally go from high idle to normal low idle) it smooths out to normal behavior. 0T TSI Misfires and rough idle. After about 15 seconds the truck smooths right out. Recently, my truck began to idle very poorly when starting cold. Jul 20, 2012 · The engine control system is open loop (no feedback from the O2 sensors) when the engine first starts from cold. Dec 1, 2020 · Now that the cold is back (below 40 degrees F) when the engine is completely cold it turns over for up to 5-7 seconds before starting and seems to be idling too low causing it to run rough and buck and shake. 98. 2771 - can bus type - but could be several issues. 9 2wd 5 speed completely stock with 206,000 miles that was bought new by my family, so this truck is very important to me. tan4x4, Dec 25, 2016. No codes. Welcome to the forum. Apr 26, 2017 · You should definitely check out some youtube vids on F250 6. To try to correct the problem, I have changed: Spark Plugs, Ignition Wires, Cap, Rotor, Air Feb 3, 2008 · Rough idle when cold. - Engine hesitates/poor throttle response during first few minutes of engine operation following initial cold start. Jun 22, 2010 · 2003 Lincoln LS. … read more. A rough idle might be caused by spark plugs or spark plug wires. 6 L Engine. . I have replaced the spark plugs which were due and replaced the idle air control valve also. Once warm, the fuel mixture leans out and all is well. Starting the truck first thing in the morning, it idles very rough for about 30 seconds and then smoothes out. 2008 6. Current temps are single digits in the morning, approaching 10C. WHEN IT HAPPENS: sometimes in cold weather, but many times in cold weather it does not happen. If it doesn't come down, it may be suspect. I have always felt low RPM hesitation, especially with A/C on. I'm starting to notice that on each cold start up (or even if the engine sits a couple hrs) that the engine sputters for about 1-2 seconds. Jun 1, 2004 · A recent tune-up included new fuel filter, air cleaner, and PCV valve. Causes of rough idling during cold starts. 5 5 speed. Whole process from start, rough and back to smooth is under 20 seconds. 2285 posts · Joined 2023. It's a rough idle, very choppy, it lasts for about 10 - 12 seconds. I have a 1999 Ford Ranger with a 2. I am getting misfires codes, and sometimes stalling and flashing CEL, on start up in cold weather. More noticeable when shift to D. Don't drive it until it's plenty warm. the idle will jump to 1100 then settles down at 900 and then slowly drops as per normal warm up. #1. Then it will slowly drop rpms down to 750rpm (normal warm engine idle) as engine warms up. It typically sits around 1800 rpm's when cold starting, but no it typically start at 2500 and it will rev up to almost 4K RpM's and keep going back and forth between the two. $16. I have a 2000 Ranger 3. For the most part I drive on freeway and tends to smooth out once I Feb 25, 2010 · 2000 Ford f-350 7. When started runs very bad and will barely accelerate until warm. #7 · Oct 22, 2012. 8L V8 EFI. 7 has had a slightly rough idle since new, like a misfire every few seconds, and even stalled a couple times when first started when cold. I replaced the MAF sensor hoping that it was the issue Aug 19, 2018 · My cyl 4 has a lot of misfires, not enough to set off a DTC. When turning it over the second time just seconds after it died, it has a hard time trying to start with stumbles, but it finally starts with it running rough, but this second time it smooths out after a couple of minutes and runs fine Jul 21, 2014 · Rough idle at startup 2005 Deville. I took a video of it to get your thoughts on what adjustment (s) need to be made. To clean a fuel injector, use a good quality Jan 6, 2023 · B. when i first start the engine it loads up,runs rough untill-it warms up (normal temp. Once the idle speed starts to come down, the idle smooths out. Then drop to 1,000rpm after a few seconds. Allowed. (been doing this for about 9 months) throws no codes, never has, mil works fine Oct 9, 2020 · I notice on my 2018 2. 1)Failing FICM. I tracked it down to worn injector tips. Apr 16, 2016 · Well - quick update, New Battery, small change, replaced Thermostat and same results, after sitting for a while (about 6 hours plus) on the initial start up the motor starts, RPM goes up normally and the idle is rough for about 2 - 2 seconds and RPM kicks up a little, idle smooths out and then smooth, if car is still warm no issues what so ever. The reasoning for this performance lies in comprehending how engines utilize vacuum and how leaks disrupt normal function. 7 I5 with 120,000 miles on it. It was drove home after a 4 hour trip and ran fine in the rain and now this is what happend. I haven't changed anything since installing it/driving it for a bit and that was only the idle-speed. Let’s go through them. This is an older thread, you may not receive a response, and could be reviving an old thread. Jun 5, 2012 · After 3 - 10 seconds it smooths out and runs fine. If I let it warm up for about ten min. Definitely as already stated look at some good oil, I personally have used Rotella T6. Temp out is about 75 degrees. Drives normally. This happens when engine is warm. When starting cold, it idles a little rough for a bit, but then idles smooth. It generally happens in the morning or when the truck has sat for a few hours. It starts right up but with the choke fully engaged it shakes and sounds like it’s running on 4 cylinders but smoothes out in about 30 seconds. Uluz2a6. Jun 11, 2021 · Fuel nowadays is much cleaner than in the past and the inclusion of different additives has further enhanced its cleaning properties. #15. I have changed the plugs, boots, cleaned the TB, and also recently cleaned the MAF. I did change the FCA before I realized what was happening. #1 · Aug 13, 2016. Lately I’ve been getting a rough idle, the engine hiccups when cold start. Twice now, I've noticed my car has a very rough idle upon a cold start (i. Not sure if this is the culprit It might be engine misfiring, vehicle cranking or unkempt acceleration. When starting a WARM engine (3800 Series II) the idle is unstable, rough and stumbles for 3 to 5 seconds, then smooths out. 5EB. 0 stiction, cold start and the like. If it runs smooth then your issue is the vanos. Aug 24, 2018 · 7. Aug 13, 2016 · 6 posts · Joined 2015. When the car is started it turns right over but runs rough at an idle around 400-500 rpm. Lasts 15-30 seconds while the idle is high. Only complaint is the really rough idle for a couple minutes at cold start-up. 2008 F450 Lariat Crew Cab 4x4 Auto. Once the O2 sensors get hot enough to start working the system goes into closed loop control where the info from May 7, 2014 · Its not even that cold out, its zero Celsius, so 32 F Its much better even when plugged in, even up to 8 degrees Celsius, 46 F, don't notice it as much above that, but still there a bit. AUTOMATIC. Still does not idle smooth. Based on my limited experience, common reasons for rough idle when cold include: Vacuum leak at intake manifold that closes when metal warms up. It's very noticeable when it hits about 1500 RPM. Have the 2016 CTS 8-speed, all wheel drive with 3. It runs great but just sometimes when I start her up and the truck will feel like Dec 3, 2010 · Rough idle/misfiring on cold start up. - Engine runs rough during the first few minutes of engine operation following initial cold start. I tried the following (and most were due for a change anyway) to no avail: - Smoke test: All good. Jan 5, 2017 · My Yanmar is running very rough for about 5 seconds after starting then smooths out: It started doing this immediately after I replaced throttle and shift cables, replaced coolant hoses, replaced fresh water pump, and removed injection pump access plate to clean/lubricate the throttle lever. #1 · Aug 21, 2016. It's rough for about 30 seconds, then seems to come under ECU control and idles smooth and quiet after this. Try this some morning and see if it runs smoother, disconnect the vanos intake solenoid electrical connector before starting the motor. First time I could feel the car shaking a bit, and the note from the exhaust sounded as if the engine was misfiring. Apr 20, 2018 · Hello Everyone, For the past few days whenever my start the RS (2017, HG recall done by the dealer) I noticed that at cold start the car idles rough and I can hear like a sputtering/misfiring sounds from the exhaust. Oct 9, 2010 · Originally Posted by SilverBullet131313. 2880 - is the HPFP as you say. I reasoned that the viscosity of the fuel got thinner after the injector warmed up and it essentially leaked into the Mar 24, 2013 · CES/Steed TS Precision 6466, spraying a "$π!℅" load of meth. A search shows this is not uncommon, and sounds like it's due to the idle FWD. 4l it runs rough for a few seconds then smooths out. 7 rough idle/misfire & maintenance - My 2016 2. After about 10 seconds it would smooth out perfectly. Mar 5, 2024. 2K. 1994 k1500 5. Feb 18, 2008 · On cold startups it runs rough for 2-10 seconds. 2001 E39 525i. Possibly some loss of power while driving. If I shut it off then restart, it will usually run fine. I bought it new, and have maintained it diligently. Sep 21, 2019 · If I feel the rough start and left the car in park, the engine begins at 1,500 rpm like a normal cold start up, then after 20 seconds or so the RPMs will begin to lower to 900 or so, but then at this point the RPMs keep dropping and the car begins to sputter & I shut off the engine. 0 automatic - Most times at start-up one spark plug (the inside-most passenger side) seems to be wet with gas, burns it off in 10-20 seconds and then truck runs great. #1 · Nov 12, 2014. If I take off after it smooths out I only make a mile or two before it runs rough and shuts down. Replaced plugs and wires. First of all, thanks to all of those who responded and jarred my brain a bit. During cold start ups the truck idles rough and I mean really rough, until the secondary air injection pump kicks on which then will smooth out the idle. Switch oil over to Rotella 5 -40 Synthetic. LeadFootDiesel. Reverse Backup Camera, RAAYOO L002 HD 170 Degree Wide View Angle Universal Car Front/Side/Rear View Camera,2 Installation Option, Mirror Non-Mirror Image, 18. 3L Vortex - The previous owner had a Longblock installed in this blazer, there is approximently 15K miles on this engine according to the shop paper work that replace the motor. They also tried to tell me it is normal. 4 V6. Sep 14, 2010 · An electronic component that is out-of-spec when cold may not be apparent to the computer. It typically starts the next time I crank it. It Can Be Because Of Spark Plugs. It was intermittent because of outdoor air temp and whether or not I was running the cab heater at startup. 9 Rough idle at startup - I have a 1993 F150 4. The car used to start in under a second of cranking, every time. What next? It still idles really rough for a couple minutes at start-up, then smooths out and runs perfectly. So the fueling and spark timing is just based on the map and correction factors stored when the engine was shut down. After the engine gets 1/4 of the way to running temperature, the idle smooths out and everything is just peachy. Jul 5, 2016 · Sounds like you may have gotten some bad fuel during your travels. Dec 22, 2009 · 4 posts · Joined 2009. com. Not necessarily. It has been a great car so far. Starting this weekcar starts fine but idles rough for about 15 seconds then smooths out and runs normally. It usually only happens on cold starts. After 25ish seconds after starting the exhaust note gradually smoothes out. 11. It smokes and sputters until after start up and after 5to 10 minutes it smooths out all of a sudden. I have repalceded fuel filter, plugs and cleaned the MAF and IAC at Mar 30, 2024 · A repeated vacuum leak pattern exists where engines run rough during cold startup then smooth out once warmed up. 7 Cummins Conversion. Hope this helps. Then it slowly starts to clear out. To much fuel and weak spark will cause rough running because the engine is basically being flooded. AFter warning up, idle smooths out. Only happens if the car was sitting overnight. Bad temperature sensor (there may be several temperature sensors) Moisture somewhere in ignition system. . 2. 2015 Chrysler 200 Ltd - Built 03/15 - Vivid Blue. R. #2. Feels like a fouled plug or injector issue but it's not throwing any codes and runs great when its warm. #1 · Dec 22, 2009. Mar 1, 2014 · C6 Corvette General Discussion - Rough Idle upon start - Just purchased an 08 z51 with LS3 and noted that upon cold start it will idle rough for about 15-20 seconds and then smooth out. I'm tempted to replace it but it's not cheap. After about 5 minutes or so it clears up and runs just fine. It will start normal then start like a out of time miss. Started it again Monday morning and no rough idle. Dec 16, 2008 · If its running rough when cold it may be because of open loop its running in, the computer will use presets for fuel delievery, any vacuum leak or fuel delivery issue, the computer will not compensate for untill it gets into closed loop, probably a few minutes of running on that old of a vehicle. 99. If that's the case, you'll have to go to a shop with either factory scan tool or a capable aftermarket scan tool to reset the alcohol content. Need diagnosing help on 99 M3 E36, Rough Idle, Cold Start Issues - FIXED. advice needed. Dec 27, 2018 · OAUTOO 25pcs Cowl Trim Retainer Clip for Toyota 90467-09212. 5L. I went to AutoZone and picked up an IAC and changed that Monday night. Only when stopped at a light. 1996 Ford Escort 1. If I try to take off before the idle smooths out she will sputter and die. 4A System with Nav. No white smoke or anything though. Participant. #7 · Apr 21, 2009. 91, STFT +3. Feb 26, 2017 · Received 244 Likes on 189 Posts. If the IAC is working properly, the idle will come down on it's own after several minutes of high idle. replace egr,o2 sensors,spark plugs and i'm leaning toward the tps sensor which i am told controls Aug 25, 2021 · I'm working on a 92 F-250 with the 5. the truck runs great on a cold start, drives just fine for about 20-30 minutes and then will start to sputter and stumble and gets progressively worse until it eventually stalls. Jul 14, 2017 · Application: 2001 Silverado HD LQ4 6. Check injector #3 wire and ensure that the injector is rotated to a 2 o'clock position. 0L V6 with about 105k miles on it. I requested they start a new G80 to prove this is "normal" and received a blank stare. Already New fuel pump, New WIX fuel filter, AC/DELCO tune up, LOTS of fuel cleaner, DEEP cleaned the intake with Gumout+PEA. We work on 60-80 trucks a week and it's very rare to see injectors fail on a 6. Once the car has been on for about 30 seconds to a minute, it will idle Jan 28, 2019 · 2. Main 2 causes of rough idling in 6. Spark plugs will use an electrical current received from ignition coils to ignite the air/fuel mixture within the combustion chamber. Now it sputters and vibrates when 1st started. also, no dtc's are stored in the pcm. after that it evens out and runs just fine. 2013 3. Although you won't see this often, an engine rough idle can be a sign of problems with the fuel pump or fuel pressure regulator. it backfires and stumbles. Nov 22, 2017 · 1989 suburban tbi 350 initial cold start runs rough. 2)Stiction. 4. WHAT HAPPENS: The truck will start and run kind of rough, like it is missing 2 cylinders, or very rough, like it is missing 5 cylinders. Apr 26, 2010 · But you know about that already pretty much. Dec 25, 2018 · She smells very rich as well. Let the idle smooth out first and she is good to go. After 1/4 mile the engine light came on, drove … read more. Feb 27, 2019 · I too solved my rough idling upon cold start but much differently than what I’ve read as far as suggestions. - Inspected vacuum lines for kinks: All good. I have a 2000 Vulcan with 105K. Wh … read more Jun 5, 2017 · Hi all, My 2014 2. Fuel Pump. Just passed 100K miles. 0T that I have a rough idle within 30 seconds of a cold start. Hello Guys, My wife has a 2011 Rav4 Base 4wd with the 2. This will make is rev up and sputter and then rev again and sputter. Aug 20, 2013 · It was a 150 amp AUX electric cab heater kicking on the alternator at low idle. I have attached a video that shows the startup: There are no pending codes and the check engine light has never gone on. Common sources of dirt in the fuel system include old fuel, dust, and dirt. Feb 13, 2013 · Paul. I have been experiencing random rough idle on cold start. While this roughness is happening: Nov 12, 2014 · 691 posts · Joined 2013. 91 : net 0). Acura 2001TL, parked out doors in 10 degree's. but i still feel a bit of stuttering until the temp Dec 23, 2010 · Usually after the 3rd five second cranking session I can hear the car sputter when I let off the starter, like its trying to start. It usually throws a HPFP code (29F2) but if I clear it Aug 1, 2020 · The cold-start injector is in charge of smoothing out a rough idle when the engine is operating at a temperature that is below optimal levels. The idle is at 750 rpm once the engine is at operating temperature. Asked by unhappyhillb in Sebring, FL on June 22, 2010. Once I get the car started I can shut it off and start it back up on the first three second long-ish crank. 7 4L60E 4x4. May 26, 2011 · update - on Sunday I took the MAF out and cleaned it up - the 3 sensors were quite dirty. Other Symptoms: Poor engine performance when cold or as it reaches operating temperature, hard starting, poor acceleration, rich fuel mixture at idle and stalling. New head put on when timing belt went last year. Allowed to warm up for 15 minutes before driving. 140,000 MILES. Just annoying on a new car. Jun 25, 2017 · The RPMs drop to 500 and bounces to 700 for a few seconds, 5-10 maybe. I manually idle her up to about 1500 and after a small amount of time she will smooth out then idle like a rock at about 750ish. $12. It runs GREAT otherwise and idles just fine at stop lights. Start cold and let it warm up. Aug 21, 2016 · 8 posts · Joined 2015. then there is no problem. After warmup, idles fine. #11 · Jan 11, 2023. Confirm sleeve is flush to intake manifold surface around injector. TSB for the cold start rough idle and P0303 code: TSB 18-010-01. Is this normal or not. If its the valve, you could remove it and clean it up (deposits/grime could be preventing it from sealing), or just replace it. Started it Monday afternoon and the rough idle was back. Apr 10, 2015 · My 2015 Honda Accord coupe EX-L V6 automatic does exactly the same thing. The truck has been running great, with an exception; during a cold start, the idle will be rough and the engine will misfire a bit. We have gathered the reasons why one’s car starts rough and then runs fine. Sep 30, 2010 · Rough idle on start, then smooths out. 4 starts rough from cold and the exhaust smells strongly of gasoline. Rough Idle at Startup 3. New plugs and wires about 1 year ago. Optional 18" Satin Silver Rims with 235/45/18 Tires. One such issue that most drivers face is when a car starts rough and then smooths out. Nov 6, 2013 · On a cold start (overnight at -6C in the garage, or after working all day) the engine runs extremely rough, with vibration and much noise. Aug 16, 2010 · Aug 16, 2010. It burns my eyes. Sounds fine. I recently poured Seafoam down the carb to try and take care of a slight miss at idle. Jul 6, 2021 · Has a rough start then the idle jumps up and down a 200 rpms, then it will act like it is loaded up and dies. 2781 - is inlet camshaft sensor. Aug 28, 2012 · I have a 1999 safari with ( i believe a 4126) in it it starts up and appears to run on 2 cylinders. I don’t notice it while driving/moving. So to tell if computer is doing it's part, your idle should go up to 1,500rpm when first started. range on gauge) then it smooths out and runs great except a little sluggish on take off. It starts just fine, but shakes and idles rough untill I press on the accelerator, then seems to run/idle just fine. Replies. One the engine reaches the right temperature, the cold-start injector turns off. This is usually a clogged fuel filter, a failing fuel pump, or a problem with the fuel injectors. I have a 2013 LTZ. ru kf rc ec jk gp dj np xr sg