No other modifications. I had been noticing some intermittent rough idling on my 9-3, but this last weekend, I started getting a few cases where the engine stalled out at a stoplight, and problems with warm (hot) starts while running errands (i. Start the engine and see if the idle rpm is normal and that the surge problem has gone away. If the truck runs rough only at idle, a stiction issue is likely, so treat this the same way. You may have to register before you can post: click the register link above to proceed. Reader Question. ,, and then most of the time it runs reasonably well. idle speed valve. 110", then it is probably safe to say that the head has been "decked" approximately 0. After Starting the engine within 2 min engine will not accelerate above 2000 rpm in or out of gear. The major problem is that it runs fine at start, but once it heats up it begins to idle rough. Changed the IACV today and made no difference. 2l w124 Please help. Troubleshooting steps performed: Suspected poor air-flow. thank you for answers i have found the culprit it was the cold start inj time sw. They will probably do the filters. At cold start engine was idling very low, around 500. On the first start of the day (an engine cold start) the car start just fine. 4 liter 22re engine. sensors with an ohm meter both hot and cold readings. Another guy said that he timed his CJ at idle, instead of the recommended 1600 RPM, and that resulted in it being 7 degrees off, and running poorly. Both tested fine. Mine was doing that off and on too. 011 when the engine is "hot". Your a/c should NOT cause your car to run rough. Runs really rough, like it's misfiring. I replaced the egr - Answered by a verified Toyota Mechanic We use cookies to give you the best possible experience on our website. Rough Idle/Engine Hesitation when engine hot was created by 96Pontiac Okay so I looked around on the forums both for the codes I have and my problem my 1996 Pontiac Grand Am (2. The engine is a 12. As soon as it warms up runs perfect. This usually happens 3-4x before it finally starts and the idle increases to normal. the car was running at idle in a parking lot for several. The problem is that when the engine is cold it idles very very high, and when the truck warms up the idle will surge. If it is, there's a problem. When a Ford Focus exhibits problems with running roughly at idle speeds, auto mechanics generally look first to either a vacuum problem, or more often, a problem with water getting into the Differential Pressure Feedback Sensor (DPFE), a part of the EGR (exhaust gas recirculation system). I need help getting vacuum on port A of the Throttle Body, a way to check the Idle control Valve, a way to rule out the EGR Valve. Basically the blower motor at all. It would idle fine on startup, but after getting warmed up, it would idle rough. 1994 Toyota pick-up 22re stumbles at idle and just above when engine gets warm. 5 » Jul 28, 2009 5:02 AM I have done a pretty extensive search, but have seen either all different causes or old posts that have no conclusions. Hey guys, Sometimes when I start my R34 GTT (98, NEO) it sounds like its stuttering or spluttering, but it starts each time. Plenum is attatched to manifold and mounts up to the crossover housing. Re: Hard start - Rough idle May 21 2011, 6:33pm Sounds like one of the only things you haven't done yet is replace the fuel pressure regulator, so I'd try that next as it's a pretty cheap part and should be fairly easy to replace. My check engine light does not turn on either. It turned out the solution, for me, was to replace a spark plug coil that had gone bad. It's main issue (among several) is that it runs rough and smells like gas at idle. one particular time, it died. blah, blah, blah. It starts blowing cold air again after we have accelerated and keeps blowing cold air while we don't stop. Just wondering what you guys experience for a cold start. Installed by my mechanic, not me. Diagnostic Trouble Code(s) P0300 through P0306 may set. The purpose of this article is to highlight some of these common problems and how to fix them, so your mighty "Five-Oh" runs just as good, if not better than it did during the Reagan/Bush Sr. I have a 91 GMC Jimmy which idles horribly (and it has even stalled) when it is cold outside (17* C or less) and it is the first start of the day. Also cleaned throttle body and mass air flow sensor. 1985 22RE that has a really rough, low idle after a strong start, especially when the engine is already warm. Here's the scenario-when the car is warm, as in close to or at operating temperature, and I start the car, the car idles like sh** between 300-600rpm, and then misfires if I rev it at all. The issue is on startup after driving car and fully warming up and shutting down for 20 minutes. The most common symptom is a rough idle condition. Jump to Latest Follow 1 - 18 of 18 Posts. However, when it is started after it has been driven and the engine has heated up it sometimes (maybe 1/3 of the time) idles rough as anything and feels like it is going to stall. However it would only do this after warming up. You may also notice that your ABS light comes on. You could also see one or more of the following: Loud vacuum leak noise coming from the area around the Spider's electrical connector. A low or rough idle on a Air Flow Meter style engine can be cause by any vacuum leaks in the intake. Yesterday my 2005 Honda Accord was running at a low idle when cold and stalling out when warm. 3) Checked the timing and adjusted it, and then adjusted the idle to the original specs, made the P0505 problem go away. When I first start it, it idles up and idles smooth, I assume because the choke is engaged. I have taken the car to 3 different dealerships in the past to get it fixed and noone was able to figure out what was wrong. Then it will return and hold normal idle. Changed the IACV today and made no difference. Discussion in '2003 - 2008 Toyota Corolla' started by corolla15, May 5, 2014. Three times now (over 6-7 month time period), when the car was started the engine would idle rough and eventually smooth out after 10-15 seconds. 8L gets around 12mpg and seems to shake a bit when started cold and has a bad rough idle when warm: Rough Idle/rough Acceleration After Warm-up: Engine Low/rough Idle At Warm Start: idling rough at warm up: rough idle, wont start when warm. It runs great except for rough, unsteady idle for a couple of minutes after a cold start. It would idle rough and when it was hot, it would act like it was going to stall every time I came to a stop. com and affiliated sites. The engine was turning over very fast but she would not fire. It is nothing to cry about in my book, so I am not going to do anything about it. Re: Hard start - Rough idle. finally, it smoothed out. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon. I have been experiencing some annoying rough/erratic idles on cold engine starts. My dad has a 90 toyota 4x4 with a 94 22RE in it. problem is when starting car while it is still hot from the previous start,. I put it into reverse and this is where it craps the bed. Upon returning to the shop, the mechanic thought the cause of the rough idle might either be bad spark plugs or bad iginition coils. On the first start of the day (an engine cold start) the car start just fine. What Are the Symptoms of a Bad EGR Valve? The most common symptoms of a bad exhaust gas recirculation valve are rough or misfiring idle, detonation, stalling and hard starting. 6 engine codeY. The truck will start but rough in the morning cold. No engine codes mentioned in report. My routine is reach office at 9am, then park the car there till about 12+pm before driving off again. Rough idle/shaking engine sounds familiar! 93 300e 3. Cold stalling problems are the most common because the engine needs a richer fuel mixture to maintain idle speed until it warms up. The oil was leaking down onto a valve and causing the cylinder to foul on a cold start. Now it starts good in all conditions BUT when i start it warm or hot it idles a little rough and low (800), the fast idle works very good when cold, the engine rev very good, just the idle that is rough and when i drive it and come at a stop light i slip it out of gear the rpm drop below 1000 then return to 1200. 1989 Toyota 4wd Truck 22re EFI, SR-5 Xtra cab, 5 speed manual transmission California. Other than this everything seems to be running very smoothly. Almost everyone is describing an idle that hunts around and won't settle at the proper RPM. After the new plugs the truck ran great till after driving it for 15mins. This is an ancient thread but I didn't want to start a new thread based on the same issue. Re: 2003 Yamaha VX200 (OX66) Hard Start Rough Idle when warm Yes, tech found gas coming out top of VS, opened it up, found worn needle valve, honed seat (can't be replaced), replaced needle valve, lake tested, warm hard start still existed and he check VS (pulled hose off top) to make sure gas was not still leaking out top of VS. benzthinkin · Registered. I know some see 28-30psi. It seems to be loosing it's prime. I started Jeep Wrangler TJ Forum to. Whats up guys,need a few ideas on this hard start problem. 011 when the engine is "hot". It's main issue (among several) is that it runs rough and smells like gas at idle. At the rear of the intake manifold there are 3 vacuum lines connected. Jeep enCounteRs hot MisFiRe and Rough idle Owners of 2000–2004 Wranglers, 1999–2004 Grand Cherokees and 2000–2001 Jeep Cherokees equipped with the 4. Batch fire engines typically idle best in the mid 13's, so if you're leaner than that, put in some more fuel and see if that stabilizes the idle. Fixed this problem but the rough idle isn´t totally gone. Here is my situation - the truck runs like a top, but it idles rough after it warms up. I was given P0300, and P0303 codes indicating multiple cylinder misfire and cylinder 3 misfire. IT has a new coil pack and new plugs. Engine does not idle rough, or stall at stop. When the alternator is going bad, other systems that are powered by the alternator may start to act up. My 92 Toyota pickup (22re engine) has developed a bad surging idle issue when the engine is warm. Symptom first developed about a year ago. You may have a misfire, a vacuum leak, or a clogged/faulty idle air control valve. Other things might be causing these failures, but it's worth taking it to a trusted auto repair service to have it checked out. I own a 1995 Toyota Pickup. Sponsored Links. APDTY 141503 IAC Idle Air Control Valve Compatible With 3. idk if that is a problem or not. If you tryed to give it a little gas the motor it would die and when trying to restart it would take a while. problems under load. Setting the transition too far out, would result in a sluggish throttle response, since the ECU would see a longer idle section on the TPS. 8L gets around 12mpg and seems to shake a bit when started cold and has a bad rough idle when warm: Rough Idle/rough Acceleration After Warm-up: Engine Low/rough Idle At Warm Start: idling rough at warm up: rough idle, wont start when warm. Is this solution still working for you? Ive had some random strings of good days with no issues at all, now some bad days where it will go rough like. Sometimes it barely keeps running and dies. 1985 22RE hard to start when warm/hot rough idletried all the "Fixes" (1 2 3) LT1UltraZ. No idle up for a/c and no idle up for cold start. it doesn't matter if the engine is hot or cold. Then yesterday it just craps out and won't idle. Common reasons include vacuum leaks, carburetor problems, ignition issues, damaged power circuits and dirty fuel injectors. Help! 94 22RE rough acceleration when only when warm and only first 2 or3 gears 94 pickup won't start warm (sometimes) 93. After driving around town and starting the engine back up is when it does this. Depending on the motor combination cam compression etc. It starts fine, but just after starting it. The fuel rail pressure threshold for cranking occurs around 5,000 psi. The engine starts to idle really rough and starts to sputter. An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. But once it warms up, the idle RPMs slow down and the idle becomes very rough, at least to me it seems to be rough. Aux Air Valve or Aux Air Regulator could be busted, but probably not. Came out 7 hours later for lunch, and it was running rough right off the bat. I engage the warm-up lever every time I try to start it. Foot on the brake and it acts as if I was pre … read more. Is the air box and lid properly secured with no leaks or splits in the intake tube. After a total of about $1000 in repair bills the truck is finally running ok. you might be able to get a refund on that from a dealer. 2) It uses less choke to cold start 3) It keeps a bit cooler, althoug warming up still takes 10-15 kilometer 4) It is smooter and has better response running between 1500-2500 rpm. Only on cold starts (When the engine is cold that is) the engine idles rough and very low. car getting hot at idle. The dealer replaced the plugs, which it was due for, and wound up replacing a coil pack to correct the problem. I recently found a problem with my truck. 92 Toyota Pickup surging idle issue 85 Answers. , park, go into a store for 5-20 minutes, and the car would crank, but not start). Either condition may be severe enough to stall the engine. Like others, a 1995 Toyota Tacoma will not re-start when hot on warm days. To test the auxiliary air valve, first verify the cooling system is full of coolant and that there is no air in the cooling system. No answers either, but my 95 900SE (102k miles) does the same thing. I have a 2011 Infiniti FX 35 that has a rough idle immediately upon cold start until the computer gets the engine to high idle where it smooths out and runs normal from there. Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Fordforums Community > USENET NewsGroups > rec. I recently found a problem with my truck. My 92 Toyota pickup (22re engine) has developed a bad surging idle issue when the engine is warm. Unlatching the O2 Sensor Plug from Connector. After a day or so of diagnostics, found #6 injector leaking. When it gets warm it drops to about 1000 I read on the internet a bit about it, but am confused a bit. 0L engine may complain of a rough idle condition following a hot re-start. « Reply #19 on: 05/09/12 05:52PM » So I am currently taking off the stator cover right now, it's not off yet, however once it started moving a bit a few drops of fluid came out, i smelled it and the fluid is gas, has anyone ever seen this before?. Because of this a cold idle problem rarely. Any ideas on what it could be or where to start looking?. Everything from hard start issues, rough idle, mis-fire, lack of power…. The engine stays idling at about 1000 RPM. I had a 22re that idled rough. 2 little wires. Been having a rough idle problem and have not been able to diagnose what is wrong. It cranks and cranks and cranks, but takes a while to finally start. If the truck runs rough only at idle, a stiction issue is likely, so treat this the same way. This is a discussion on low, rough, surging rpm at idle after hot start within the General Help forums, part of the LSx Technical Help Section category; hello, having a caprice/statesman 2004 ls1. Been having issues with surging idle in the morning at stop lights. Have a mechanic check the functioning of your EGR valve, which can get plugged up by carbon from the. Rough idle, shaking vehicle, NO CODES! Engine idles rough, to the point that the whole car shakes. 8L gets around 12mpg and seems to shake a bit when started cold and has a bad rough idle when warm: Rough Idle/rough Acceleration After Warm-up: Engine Low/rough Idle At Warm Start: idling rough at warm up: rough idle, wont start when warm. SOURCE: 1985 toyota 4x4 22re missing and rough idle Have you pulled out the spark plugs to see if there are any tell tale signs on them. I had a similar issue with an '02 XLT Escape with 170k. zx-10r rough/fluctuating idle/stall problem. I got it home and it was idling fine until I shut it off and cranked it back over, it did the same. I have spent almost $1000. It revs up and idles good for almost 5 minutes then the rough/low idle begins. The symptom is repeatable everyday. However, it is easy to recognize the problem, as during rough idling either the engine would run at an irregular rate or it may have varying RPMs without your foot on the gas pedal. The oil was leaking down onto a valve and causing the cylinder to foul on a cold start. Re: Hot Start Stall Solved - Rough Idle Issue « Reply #6 on: 06 November 2010, 01:27 PM » For the record, I have a Gunson's gastester, and it does work well, although it needs 10 mins to warm up, and the engine has to be at operating temperature as well, so it's not a simple plug and play device, but worth getting if you see one at the right. The major problem is that it runs fine at start, but once it heats up it begins to idle rough. Before the reset with the engine sitting at idle it would start running rough and then start surging until it stalled. Runs really rough, like it's misfiring. As soon as I am moving again, it runs normally. No other modifications. Took care of a few small issues that I knew needed to be done- EBP sensor and tube, CMP, ICP sensor, IPR rebuild (the original nut was missing), turbo comp. Scooter Won't Start, Hard Starting, Rough Idle, or Stalling Introduction Inability or difficulty in starting the scooter, rough idling and stalling can be indicative of a variety of issues and causes. On a cold start it high idles just as it should. Very pleased that it was a cheap fix, and now I can hold off on doing another major tune up until Xmas. Closed loop is more stable (usually) and richer idle is smoother. It used to idle at about 750 for most of the time, cold or warm and really smoothly too. Turns out it was a vacuum leak at the intake manifold plenum. When warm, it idles roughly and stalls. Note: Flow probably isn't enough to push metal parts along wherever those parts went. Find great deals on eBay for toyota 22re cold start injector. If you suspect that an injector is clogged or malfunctioning, an injector balance test can isolate the bad injector. com, but we greatly appreciate you Darin, for all your hard work!. few hours later my engine went!. Smelled flooded so waited 4 hours and attempted to restart, no avail. When a cold engine (first start of day or shut down more than 2hrs) is started and driven, I have zero problems. idk if that is a problem or not. I replaced the fuel filter. Frustrated with surging idle this could be a quick fix try this before spending money and countless hours trying to find problem. I have ran enough "good gas" through it, so bad fuel I think can be ruled out. Rough Idle / Hesitation / Stalling -- Only On Hot Starts When you start the car cold, it runs fine, idles fine, drives. You may have to register before you can post: click the register link above to proceed. Cleaning out the carburetor to remove carbon deposits is probably a good place to start. The issue is on startup after driving car and fully warming up and shutting down for 20 minutes. Started up without much issue. rough idle after start up is an air pocket in the fuel line, typically caused by a failing check valve in the fuel pump body assembly in the tank, or a leaking fuel injector that lets pressure bleed off. 3) Checked the timing and adjusted it, and then adjusted the idle to the original specs, made the P0505 problem go away. guage goes up to normal operating temp. Once I start driving it back to somewhat normal. Sometimes the engine will even die, thought it always restarts easily. Everything from hard start issues, rough idle, mis-fire, lack of power…. If so, the auxiliary air valve is stuck slightly open. I'm not sure about your year exactly, but there is a known issue with the Dodge lift pump that causes a rough idle. Mine started the same rough idle and blue/white smoke on cold engine starts about 7500 miles. Rough idle/shaking engine sounds familiar! 93 300e 3. Upon cold start up, it idles at 1600rpm for about 5 seconds before slowly coming down to a more reasonable idle of about 1000. If you tryed to give it a little gas the motor it would die and when trying to restart it would take a while. 05 Equinox, occasionally exhibits a rough start (generally after going to start it within an hour or so of it running). Designed for longitudinal placement in such vehicles as the Celica and Hilux and in production from 1953 through 1997, usage faded out as many of Toyota's mainstream models moved to front-wheel drive. Applying the brake lowers the idle, but it still surges. Online shopping from a great selection at Automotive Store. The valve fits correctly, but is the not the "proper" all black color - which bothered my "all original" sense, but I got over it. Now is a good time to check/adjust the timing, and points if you have them, as well as the idle mixture screws. I own a 1995 Toyota Pickup. I have a 2002 Frontier 3. 0L Rough Engine Idle After Restart Following A Hot Soak) It took about ten minutes from start to finish. Hyundai Santa Fe Start Stall Idle Problems in Seattle and was looking forward to getting in my nice warm, dry car and driving home from a long day at work. Jeep enCounteRs hot MisFiRe and Rough idle Owners of 2000–2004 Wranglers, 1999–2004 Grand Cherokees and 2000–2001 Jeep Cherokees equipped with the 4. 4 liter 22re engine. The PCV may cause a rough idle, hard starting and lean misfire (which increases emissions and wastes fuel). I can hear the engine "laboring" at one spot and it lunges forward at that exact spot. I get dozens of calls every day with people trying to diagnose various issues with their 22R / 22RE / 22RTE engines. When it comes to a stop light, the idle will be very rough. Rough Idle in Warm Weather. This is how you know our name. Applying the brake lowers the idle, but it still surges. I have a ’90 Toyota 4Runner with a 22RE fuel injected engine having 176000 miles. The condition and symptoms are more prevalent when the engine is allowed to heat. In this case, the valve cover gaskets must be replaced. If the truck is running rough all of the time, it can be a little more complicated. Re: 22RE rough idle ????? « Reply #1 on: Apr 12, 2005, 10:46:51 AM » check your mass air flow sensor located on the top of your air box. This reminds me of a thread I saw a couple years ago that I have been trying to find. Rough idle after cold start The last few days I've been noticing the engine idles a bit rough on cold start. Hey guys, I have a bone stock 2004. It runs fine at higher RPM's but runs really rough, shakes and sputters at lower RPM's. Is this normal? Spark plugs are only 20k ish kms old - not sure about coil packs. Rough Cold Start - Runs Fine Warm. Hey guys, I have a 2003 2. Everything from hard start issues, rough idle, mis-fire, lack of power…. it is a 94 Toyota pickup 22re. A few months ago while it was still winter in the states my 2011 SIDI V6 camaro started idling very rough during cat warm up mode and threw a few misfire codes. After removing the vacume hose, start the truck after sitting over night and put your hand on the cast iron body of the EGR valve, check for immediate heat, this would indicate a leaking seat. System can enter closed loop sooner after cold start, and idle richer in general as main cat will stay effective at idle because of the pre-cats. The problem is that when the engine is cold it idles very very high, and when the truck warms up the idle will surge. it happens everytime i start my truck. The engine will also see an open EGR valve as a massive vacuum leak, so expect hard starting and a very rough idle. Applying the brake lowers the idle, but it still surges. We have a 2008 CRV EX with 92,000 miles. it runs fine when i first start it, but soon idles low/rough, but only in gear. A rough idle will result in intense vibrations forming whenever your vehicle is stopped with the engine running. I have the same issue when the engine is cold (sits overnight @40 deg F). They should all be the same colour. i'd continually adjust the idle screw and it would be better then get so bad I had to have my foot on the accelerator at stop lights. FREE BEER if you have the answer! Fuel pump works fine as the fuel level in the port glass on the carb is correct and constant when running. You could also see one or more of the following: Loud vacuum leak noise coming from the area around the Spider's electrical connector. The IAC was flopping around, wasn’t. Help! 92 Corvette - Random rough idle/severe hesitation on start and warm Welcome to CorvetteActionCenter. The fuel rail pressure threshold for cranking occurs around 5,000 psi. blah, blah, blah. it is the same wheter the engine is cold or hot. SOURCE: 1985 toyota 4x4 22re missing and rough idle Have you pulled out the spark plugs to see if there are any tell tale signs on them. Example: If you have a late 22RE cylinder head that has a measured deck height of 3. Engine quickly turned over but just as quickly started a rough idle and the engine again stalled. i saw you have mentioned you replaced that sensor. On the first start of the day (an engine cold start) the car start just fine. No more rough idle. It runs rough only at idle when warm. I have a new Mass Air flow sensor, so I'll try that tonight. The truck hitches slightly when taking off from a stop light when left to coast ahead on its own without touching the fuel pedal. I find both hard to believe since the spark plugs are brand new (OEM-spec Champion Platinum plugs) which I've always used and I can't see the ignition coil(s) going bad suddenly. 0 runs smooth but idles rough and sometimes hard to start, other times fires right up. It almost sounds like it has some kind of race cam, lol. When I start up the Seville, it will idle roughly (always first time starts, warm or cold outside temp). 1987 Toyota Pickup Rough Idle My Pickup Will Start Fine And Idle Fine At About 650 To 700 Rpms. 1994 Toyota pick-up 22re stumbles at idle and just above when engine gets warm. And most surprising to me, the clutch chatter that had been. Mine was doing that off and on too. everytime i start my 2002 f150 super crew w/ 5. I bought a 1996 Ford F150 Eddie Baurer edition. Oil is full, truck doesn't run hot. My 92 Toyota pickup (22re engine) has developed a bad surging idle issue when the engine is warm. An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. I read there is an aux air valve that controls the cold idle, by blocking air??. I've had intermittent misfires, but now it's just the #6 cylinder that's popping up. com and affiliated sites. The truck is a 1993 toyota pickup with the 2. A rough idle will result in intense vibrations forming whenever your vehicle is stopped with the engine running. If your idle hunts when the engine is cold, but stabilizes when it warms up, try more warm up enrichment. Changed all the plugs while it was apart too since there were about 85000 miles on the truck. Online shopping from a great selection at Automotive Store. Seems to be in order. If severe, the engine or vehicle may shake. Top 10 Causes of a Rough Idle | JL Motorworks. Running Problems. Then yesterday it just craps out and won't idle. Some older cars use a carburetor to process fuel, rather than a fuel injection system. Is this solution still working for you? Ive had some random strings of good days with no issues at all, now some bad days where it will go rough like. Re: Rough Idle on initial start from cold The car last had a Ford service when it was two years old but was serviced by an independent in March this year as fords wanted to rip me off, but that's another story. Normal common-rail systems will operate at 5,000 psi at idle and can reach up to 30,000 psi at wide open throttle. It is bad however when I turn the truck off and go into a store or something (not let it cool down) come back to start it and it idles real rough and low. Other than this everything seems to be running very smoothly. However it would only do this after warming up. On some cold mornings, the car won't stay running at all without me giving it gas, and runs REALLY rough like it is only firing on two or three cylinders. Now is a good time to check/adjust the timing, and points if you have them, as well as the idle mixture screws. rough start, Is this normal ? Service, Repair & Maintenance. I have spent almost $1000. Finally figured it out! The O ring on the idle screw had deteriorated so it couldn't hold an adjustment. After awhile the rpm will slowly climb and when it is over 500 rpm the throttle pedal will start working. LH-2 Cold Idle Problems -Bad ECT or O2 Sensor and Wiring Harness Notes (BB)The block temperature sensor (ECT engine coolant temperature sensor under the intake manifold) plays a big part in cold running decisions and could pre-maturely allow the O2 sensor signal being used before the engine is warm. PCM REPROGRAMMING FOR HOT SOAK REST AND/OR ROUGH IDLE (DTC P0300-P0306) PURPOSE Incorrect PCM software parameters may cause a hot soak restart and rough idle condition within 30 minutes of engine shutdown. sensors with an ohm meter both hot and cold readings. The Rhythm of the dropping needle matched the rhythm of the misfire. Re: LOW ROUGH IDLE, Sometimes dies! I had all the same crap, did all the same stuff everyone else above did, made some gains however the bottom line for my truck was a Throttle Positioning Sensor. On a cold start the engine turns over quickly and idles very smoothly. floods at start up poor gpm stutters after shifting then bogs down while accelerating, smooths out after letting up clatter while accelerating like it has low octane rough idle when sitting for awhile, sometimes idle will rev very high after shifting check engine light is operational at start up but is not staying on for codes. Hey guys I have a 2000 Ford Ranger with a 4. I'm not sure about your year exactly, but there is a known issue with the Dodge lift pump that causes a rough idle. It cranks and cranks and cranks, but takes a while to finally start. You may have to register before you can post: click the register link above to proceed. Tried to restart it. As always this is a guideline and will be application specific.