• Careers

  • +

    Low idle on cold start

    • low idle on cold start So when I cold start the car in the morning, for about 20-30 seconds it sounds like it might be misfiring or something of that nature until the engine warms up and then the idle is normal. The Cold Start Fuel Injector ground is through the Cold Start . T. Use a fuel additive solution like Techron. Joined Apr 12, 2011 · 17 Posts . Thread starter Todom711; Start date Jan 9, 2018; T. Idle spark advance when running is pegged at 14. ecar95 · NEVER SERIOUS. Same exact issues here after 17’ HG replacement. After 30 seconds, idle jumps back up to 880 and car idles and drives normally until next ignition cycle. I remember that the idle used to be over 1K rpm during warm up in similar conditions. The car surges a bit backing out of the garage. rough/low idle at cold start. It gives it a squirt of fuel and sets the choke. Took it back to dealer today and they can't find anything because they can't get a code . The low RPM indicates that the high idle is not set, which likely means the choke is not set also. Joined Jan 16, 2012. Only during a cold start, the initial idling would be too low that the engine eventually stalls. On older vehicles equipped with a carburetor, the idle system supplies the engine with an air-fuel mixture suitable for speeds at about 800 rpm. Idles and runs great once it warms up, got 22mpg on my last tank driving in the mountains. I have a fairly new install (4 months). At the first trafficlights (3 mins away), the idle drops to about 500 rpm, the lights dim a bit, vibration etc etc. However I have to keep my foot on the accelerator for a few minutes or it will idle down and die as soon as I take the foot off. If you guys have any advice on what it might be or what I. EFI go pro 600 on a chevy 502/t56 combo. Issue: When cold, the car cranks fine, starts without a problem, however the idle is too low, around 750 rpm, as if the car is already warmed up, even though it obviously is not. If I drive the car hard and it's a hot day the idle rises way up (1500 rpm) This has haunted me for years, and noone has given me an answer to what the problem is. Normally, when I start my car cold in the morning, the idling RPMs will be about 1500rpm. I think if it was a vaccum leak which I. Low idle and slight miss on cold start (3s-GTE. Just don't like to work a bike before the temp is up. -Rich. On startup the car will not idle above 400 rpms and dies without me applying throttle. Prev. Low idle speed on cold start. Assuming that the base timing number is reasonable for your combination, engine speed should flare upon cold startup (usually in the 1200-1300 RPM range), and then, within a few seconds, decay down to roughly 100-200 RPM above your idle target. It begins with a cold engine. Mine now goes to 1300 for like two seconds the goes to 1100. On a warmer day (70 deg F+ coolant temp), I know I can run post cold start at around 14. If you run a low idle speed when warm, sometimes it's not high enough for a cold start. Should you notice any of these issues, it may be wise to have your vehicle looked over by your mechanic before your engine stalls and leaves you stranded. Normally it would be around 1. It was around 1500 I believe. The carburator is an Edelbrock 500cfm with electrical . 23 Posts. Really lumpy repsons to get the engine back up to speed. 4 Mileage 174,000. I have a 1995 Trans Am with the LT1. Idle is low at cold start up (neutral) 500rpm 2. By Raytoyota98 Topic starter 20/02/2021 4:46 am. However once it warms up it is now a disaster, idle surges between 300-700 rpm when stopped at traffic lights, very low power on take off, stalls on hard corners and slow speed. coolant temp to do about 12:1 AFR after it can idle on its own (usually about 10 . When I start the car in the morning the idle is very low. 14 1075 612. Re: Low idle at start. The Cold Start Fuel Injector only receives +12v when the starter is being applied. I get a low idle (500-700 RPM) and stalling on cold start unless I give it constant gas. It the injector is dirty or your are dealing with a bad fuel injector, it won't supply the extra fuel needed. Idle control should exhibit small spark corrections of 1-3* timing The car flares on cold start as if you have your foot on the throttle The car exhibits positive throttle follower airflow at idle TPS voltage is 0. The car wont start sometimes can be the cause of a few things. 20/02/2021 6:08 pm. As soon as 880 is reached, RPM drops to ~600 and stumbles for exactly 30 seconds. Then it drops down to 750-800. Jump to Latest Follow 1 - 19 of 19 Posts. This problem just started 1 wk ago. W. As it warms up (within 1 min) and the idle drops to normal the idle becomes very eratic and surges up and down. Usually about 30 seconds when it's that cold. Clean the IACV. only does this on a cold start not a hot start. The cold-start injector helps to smooth idle when the engine is below operating temperature. During Running temp in drive, it also idles at the 2nd line lol. When I tried to unplug the ISCV while its idling it makes no . Check the choke. I believe that with my mods and the low idle the engine is running lean so the EEC tries to compensate but overshoots and then tries to recompensate. Cold start, low idle, then code p0155. Posted by 1 year ago. Hello. e. I would think the #1 thing to look at would be the choke. I noticed a mysterious thing with my 2010 3. Joined Nov 29, 2013 Messages 8 Country Flag. Reply #7 on: August 26, 2021, 09:06:21 pm. Sometimes when i give it a rev it wants to go down to 500 after a rev almost stalls and back to 1000rpm. When I start the truck in the morning the idle is 550 RPMS. When the motor is cold, it will start right up, but will lump at idle and feel rough because the choke provides a too rich a mixture and overloads the engine to the point where it wants to run rough, almost to the point of stalling. An easier thing is to adjust the large/flat brass screw at the top of the throttle body by 1/8-1/4 turn and that will adjust your idle speed and possibly improve startup. This valve is mounted under the throttle body, and modulates airflow to the engine under certain conditions. Once it warms up it idles at about 800rpm. Discussion Starter · #1 · Jan 15 . Just kidding. I have. Idle / Cold Start. Joined Dec 4, 2004 . idles fine when warmed up a bit. Once the engine reaches proper temperature, the cold-start injector shuts off. Eventually it just stalls unless I feather the peddle. muddywrangler · Premium Member. 8 auto today (first time ever that it happened): immediately after cold-starting, for about 5 to 10 seconds, the engine struggled to idle before finally snapping out of it and idling normal, and then the rest of the drive home was completely normal/uneventful. Very rough idle on cold start, have also noticed if I get on the throttle, when coming to a light car feels like it’s going to die. Close. « on: November 08, 2017, 06:02:04 am ». Some cold mornings, I'll start the truck and it will turn over fine, but idle at around 900 RPMs. The engine runs good, but when you first start it, when the engine is cold, the idle is very low, maybe 400 RPM. The knock goes away over 1200RPMS (where the idle should be) I DID notice, when taking off in 1st gear, as the RPM dips below 1000 i can hear it too. Recently, during more than half of cold starts, my 3cyl metro has had an extremely low and shaky idle. I waited a few minutes but the rpms didn't go . At cold starts(in the morning) I still get a quick low 500rpm idle for a couple seconds then it slowly rises 1000rpms. I idle a minute or less before I drive slowly on. 3. 108. Has 500 miles and about 40 hours on it. 1983 300SD low idle problem on cold start. 4. When i first start it up for the day the idle fluctuates very low to the point it either stalls or comes close to its average of about 7-800rpm idle. Jump to Latest Follow 21 - 40 of 40 Posts. After running it for a bit or even just revving the engine a little, the idle rises to no more than 1250rpms and doesn't come back down at all unless you shut the engine off and crank it up again. Normally when you start, it'll fast idle at around 2000 rpm for 14 second or more depending your outside ambient temp. Valve is fine! 10-29-2001, 08:44 PM I find my car idles quite rough on a cold start up (ie when car has been left overnight) It is recommended that there is no need to warm up our cars for too long so I let the car idle (in Park) for 1 minute then take off. Adjust your idle. 0L V6 may start and stall, or start and run at very low engine speeds when the engine is cold. This will continue for 1-2 minutes until the car . From day one the idle goes from 500 to 2000 for 5-10 seconds on a cold start then settles at 1500 until you touch accelerator. Bought a new genuine OVP relay, fitted it into the car, car starts perfectly when cold, idles perfectly when cold, and lots of power when taking off when cold. Hey Hkp7 - The Aux Air Valve is electrically in parallel with the Fuel Pump. 7 low idle and stalls on cold start. 4k. On M52TU cars, 99-00, the failing vanos is manifesting cold weather cold engine start idle jolts and possible stall. Have No Fast Idle on Cold Start. Start up at 32 is easy and bike idles perfect at about 1050. It’s all stock other than the SBD kit. XFI cold start low idle problem. Drive off, so far all is well. My cluster does not have a tach gauge so I don't know exactly how low. Archived. Dropped it back off at the dealership. This causes hesitation immediately, however the car does not stall. I set mine to around 900 at idle in neutral and hot, and stone cold (10 degrees) it will start and the run at around 750 until it warms the combustion chambers (pistons). Current mileage 140,000. Might try increasing it a turn for cold starting. Once out of the neighborhood all is good. Hot Start - Engine fire easily, but . Clean/replace the air filter. This modification works by reducing the distance that the ISC valve can open, and thus reducing the amount of air allowed to bypass the throttle butterfly. Joined Jan 14, 2013. Some of the signs that may be a preview of engine stalling are hard starting when your engine is hot or cold, a noticeable drop in fuel mileage and lack of power when you try to accelerate. Cold weather I know about. 2001 F150 Cold start low idle. Not really sure where to start. On cold start, sensors seeing low temperature cause the ECU to open the ISC valve fully. Some models come equipped with an idle speed control actuator. Your idle screw is on the left side of the bike. 2001 F150 Lariat 5. The issue is a failed or dirty idle air control valve. Jan 9, 2018 #1 hello . R. If a cylinder is not firing, the injector is turned off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. Since installing I have noticed that it has a rough idle on a cold start. As soon as I put the car in gear (in Drive) the car vibrates quite bad. During a cold start, even when its like 40 above, it won't idle until it warms up. 1. I have the same type of problem with a brand new 2008, 100 miles. I have to feather the peddle for at least 2 mins until it warms up and then it settles down and . If a cylinder is firing, the ECM turns on the injector. No problem with pulling away when cold either, not too cold I let it idle a fair amount at that temp before riding off. You have a leak in your Intake Rubber Hoses which are between the cylinder head and the throttle valve housing. I have an F cam and trick flow heads/intake. Recently replaced coil, around 2 years ago. Usually takes about three attempts for a normal startup. Those are your stock idle values. See if that cleans out the fuel injectors. It dropped to 778-ish And yeah rich cold starts are what is supposed to happen, however 5-700 rpm is not, car runs like crap for a few minutes once warm it idles around 900 and is just fine. Normally, engine will start w/o pumping for gas. bumping this ILO of starting a new thread. The PCM monitors the idle level of the engine. It generally happens in the morning or when the truck has sat for a few hours. If your car is experiencing low-idle issues, you may need to adjust the idle speed and idle mixture. This leads to the surging idle. Yeah it is fuel injected, it douse have a "choke" for cold start not sure how it works though. I'm experiencing random low idle on cold starts that strictly seem to be based on external temps, (we all know it's cold), but it's seemingly intermittant. Pumping before starting a carb vehicle is normal. My idle is a bit rough at start up as well. What happens is on a cold start, the rpms are unusually low (about 400-500 rpms). See the article for details. It did not do this before but also I’m in Central Pennsylvania and in the last two weeks it has gotten a lot colder. Recent work that might affect this:-Pulled and cleaned throttle body and IAC valve-Adjusted TPS to spec-Cleaned MAF sensor with MAF cleaner-Replaced plugs with OEM During cold start up, it will idle right at the 2nd line and slowly rise to the middle line. After warmup, idles fine. . I cranked it this afternoon and it finally did the cold start weird shaky idle thing again and immediately plugged in the scanner. Why would I get a surging idle (500-1500 rpm) on cold start only? The car idles perfectly once warmed up a little. If you haven’t noticed most of the problems causing high or low idle are the same for both issues. After driving moderatly for a while it gets to normal operating rpm. I adjusted throttle cable at both increase idle end and spring back end. I don't get it. Seems as if not running on all cylinders at start up. However, now with the colder weather I've noticed on cold start the idle is below 1k, this is only when the outside temperature is below roughly 2 degrees. Discussion Starter · #1 · May 7, 2012. Warm it idles at 12" of inHg. I am thinking 750 RPM's would be about right, this is from what I have read, I just got the car. ACCORDING TO MECH, cold start valve and fuel check are not prone to be faulted but As STEP 7, you can now check for low fuel pressure problem due check valve by turning off the engine for 30 min to 1 hr and restarting the engine without pressing pedal. One the engine reaches the right temperature, the cold-start injector turns off. When cold my car would crank, fire, idle up to about 1,100 for 3 seconds then drop to 500, shoot back up to 800, then drop to 4-500, and then stumble and die from . 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. I can probably go leaner, especially as the coolant temps get above 100 deg F. 2001 MAXIMA; LOW/NO IDLE AFTER COLD START APPLIED VEHICLE(S): 2001 Maxima (A33) SERVICE INFORMATION If a 2001 Maxima has the following symptoms: • The engine idle drops excessively or stops when engine is started cold; • This incident is not A/T related, and may be occurring within the first 10 seconds after the engine is started cold; and The 1998-2003 Toyota Sienna 3. (e34) and now when a brake at low speeds i get loud clicking/ clunking from the front, i . less than 700 rpm) and engine may eventually stall. Vacuum when cold is about 7-8" of inHg. The problem is at cold start, the idle not staying steady ,bouncing around too low (600 or lower),then up to where is should be at staying steady, (750). I replaced the cold start sensor and it did not improve the cold start idle. Now, I kind of figured this was going to happen when cold because of the amount of adjustment I carried out on the idle speed screw but now from cold if I just start it and allow it to warm up for a few minutes before riding off, its obviously running too slow (1000rpm)is too rich and slowly starts to choke itself and cuts out. Low idle with cold engine Home › Forums › Stay Dirty Lounge › Service and Repair Questions Answered Here › Low idle with cold engine This topic contains 30 replies, has 7 voices, and was last updated by Rob 7 years, 9 months ago . 4 V6 I have been experiencing random rough idle on cold start. I expect most 99-00 owners have experienced this symptom. On cold start it starts instantly and when running on fast idle its very smooth. Revs slowly drop to ~880. Comparison between the two cold start modes depending on ambient temps Cold starts at 1000 RPM every time all the time, warm it's about 1000 or 900 RPM and falls to 600. Still no word yet. 86v All of which mean the car is not even running in an idle controlled state. Idle is low enough to cause it to idle rough. 2. Change the fuel filter. I tried another ISCV and exactly the same problem, idling at 1000 cold. Replaced plugs and wires. It has been around low 30's in the morning going to work and upper 40's in the afternoon going home from work. Discussion Starter · #1 . Go. Possibly some loss of power while driving. Re: rough/low idle at cold start Mon Jan 16, 2012 2:53 am So far without having a Factory Service Manual this is the list of (8) Sensors I've came up with that are used with the 1st Gen PGM-FI System. Discussion Starter · #1 · Sep 29, 2017. Jump to Latest Follow 1 - 9 of 9 Posts. To do so, the intake airflow must be regulated during closed throttle conditions. The problem can also be with the switch, circuit or control . N55 Cold start/idle issues. I’ve also only owned the unit for about 3 months. Joined Sep 17, 2018 · 23 Posts . You have to hold the pedal down a bit to get it to start. it wants to idle at 1000 rpm. Car: 2014 VW MK6 GTI DSG. And yeah rich cold starts are what is supposed to happen, however 5-700 rpm is not, car runs like crap for a few minutes once warm it idles around 900 and is just fine. Also, I'm running mechanical & vacuum advance distributor. If I remember to plug the engine heater in at night - no problem at all. I find my car idles quite rough on a cold start up (ie when car has been left overnight) It is recommended that there is no need to warm up our cars for too long so I let the car idle (in Park) for 1 minute then take off. Here is how it idles: 1. After of which, idle drops to 1300 rpm. Cold Start Lever Cable is jammed and the valves cannot close. westman · Registered. It’s thrown the check engine light twice. Kent, On the rather rare cold morning here in Texas my 1983 300SD will start without any problem. The PCM regulates engine intake air at idle using an electronically controlled device . Was it all the time at 1500 rpm when cold? When I start the engine, it jumps to 1500 rpm for a few seconds, then it drops to cca 1100 rpm. It starts just fine, but shakes and idles rough untill I press on the accelerator, then seems to run/idle just fine. . "Excessive" cold start idle speed can be reduced by "fiddling" with the ISC valve to shorten it's stroke. #2 · Feb 8, 2013. Joined Nov 27, 2003 · 861 Posts . On cold mornings the DME utilizes the vanos to help warm up the cats to bring them to operating temperature faster. If you wait long enough it will restore itself to 800 rpm (as it should be). Keep your air filter clean and don’t run bad gas. If the injector is dirty or you are dealing with a bad fuel injector, it will not give the extra fuel needed. When i bought it, it idled low so I turned it up, and it started and ran great for about 4 months. Surging idle on cold start only! I did a search already but didn't find anything specific. I feel like it would constantly be low idle if it were an issue with the valve Discussion Starter · #1 · Sep 29, 2017. My White Pearl XV, which I picked up last Monday with 7 miles, is my first Subie. Dealer cleaned throttle body 3. Slow idle on cold start/wants to die. You should just need the low idle adjustment. It only does this below 1000 RPM, on a cold start. AFter warning up, idle smooths out. K. 1; 2; First 2 of 2 Go to page. There should be a spring on the side of the carb that sets the fast idle and choke when cold. 850 Low idle on cold start. Very low rpm, car feels like it’s steuggling. My software says the IAC is opening up at cold startup but I am not getting high idle at all. Jump to Latest Follow 1 - 8 of 8 Posts. Cold start and rough idle. Rough Idle on 2008 Forester X. Cold Start - Engine fires immediately and goes to ~1000 RPM for the normal "warm up" cycle. Jump to Latest Follow 1 - 4 of 4 Posts. sw201444 · Registered '91 Turbo with a JDM '93 swap Joined 11 mo ago · 211 . When the engine is above 150 degrees I get high rpm right when it starts, then ramps down to 900 rpm like its supposed to do. Looking for suggestions, after cleaning the throttle body with vehicle off, with 1/2 can carb cleaner and a shop towel,allowed one hour for evaporation. Others have posted similar stories so I don't worry about it and think it is a part of the nature of this engine and /or kia needs to tweak their cold fuel mapping. Once it hits 180 degrees idles at 950 as st and performs flawlessly. kenakin · Registered. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle. She starts up, but won't idle without the gas pedal applied until about 80°F, where it will start to idle on it's own. I feel like it would constantly be low idle if it were an issue with the valve During a cold start and/or extended periods at low idle, the engine's Electronic Control Module (ECM) turns off one unit injector at a time to determine if each cylinder is firing by monitoring the change in the fuel rack. On second startup attempt, idling goes up to usual level but goes down to below normal idling (i. After about 1-2 min of warming up, it drops to about 800-900 and drive from pt A to pt B. I can tell you mine doesn't exibite any of those traits. I know what you mean about the build up of crap on the butterfly, took care of all that when I bought it. The only way to definitively fix this in my case was by adding a PC5 and increasing the fuel at startup. 5* flat. RogerD31 · Registered. 123 Posts. By G. Todom711 New Member. I have to sit in it for about a minute, holding the throttle, until it will barely idle. The ‘Cold Start’ is a term used engine drivability implemented only when the engine is at (or lower) than ambient temperature. The DME on mine always keeps current to the middle and bottom post so it stays closed and hence a rough low idle on a cold start up. Both the AAV and Fuel Pump receive their power at the same time from the Fuel Pump Relay (XVII). I believe that it is the Idle Air Control Valve. Causes of rough idling during cold starts. It seems to have plenty of power and does not smoke. Joined Nov 18, 2008 · 7 Posts . #4 · May 1, 2013. Once engine temps warm up it idles normally. Once the auto choke begins to come open it smooths out. In the winter (no lower than 10 deg F), I have the fuel enrichment vs. I'd say within 2 minutes the RPMs will come up to 700 or so and idle fine. Normally 1100 then dropping after 90 seconds or so. 0:1 AFR without misfiring. 4 Posts. ·. The long issue I have not been able to sort out is the cold idle. It’s a 2016 R. 97 T100 156K 3. 132,985 Replaced battery (low voltage on crank, so replaced thinking it might help the cold start issue) 132,985 Replaced catalytic converter (still throwing code P0420 and idling low) 131,683 Replaced EGR valve, header gaskets, & cleaned throttle body (still throwing code P0420 and idling low) When the motor is cold, it will start right up, but will lump at idle and feel rough because the choke provides a too rich a mixture and overloads the engine to the point where it wants to run rough, almost to the point of stalling. All readings were the same except idle RPM. Low Idle on Cold Start up 1. Hello, so I've got a 2013 A500 and it's been a dream. Discussion . I'm bothered with the rough idle when the engine is cold. Have adjusted cold start fuel with no impact. Joined Sep 22, 2010. Idle is 900 RPM for my car. Discussion Starter · #1 · Dec 20, 2012. Discussion Starter · #1 · Sep 29 . low idle on cold start