Hello - brand new to the forum but wanted to reply to your 825 rough idle issue. Our issue was that the engine would idle slightly low (940-960 rpm) and sort of sputter. When the throttle was depressed, the engine would struggle and cough until it reached 4000 rpm with no load. After roughly a minute. The idle would increase and become steady. When I start the car cold now everything seems fine at first, but as soon as I put it into gear I get a rough idle. It's pretty rough but doesn't sound like it will stall or anything. When it starts in park it is around 1700rpm, when I put it in gear it goes to about 1000rpm and that is when the rough idle starts.
Very rough idle with a repetitive cycle that is smooth for a couple of seconds then misses badly, occasionally stalling. running rough idle. The engine stalls in neutral, at idle, only. But, check just to be sure. Problem: Car runs really rough from a cold start untill the valvetronic settles down to 0.

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A common concern DIY Toyota and Lexus owners call CARspec for is a rough idle, starting and dying, or a hard start just after replacing or disconnecting the 12 volt starting battery. We wrote about something similar on the Prius, being a common cause of the MIL. -
96 5.0 When it is warm the truck starts, runs decent but misses still, usually way worse under load. When it is below like 40 the truck either will not start or will idle rough to the point its choppy and throws fireballs until it reaches ECT reading of...
I got rid of my cars cold morning rough idle by seafoaming the secondary air pump. My car had rough idle issues only on cold morning starts for the last two years and I could never find the cause. It would not do this the rest of the day or after about a minute or two after the initial cold morning start.

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So a month or 2 passed and the rough/low cold start idling issue resolved but I'm still left with a noticeable high idle at 1000-1250 when warm. Help anybody? Looked for any vacuum leaks and I'm yet to find one yet. The weird thing is that it runs totally fine besides having bad gas mileage due to the high idle. -
The engine was running rough (misfiring) between idle and 1600rpm when cold. Did better once warm but stalled a couple of times and not running as smoothly as it should. Picked up a vacuum gauge ...
Feb 24, 2015 · Agreed. On my 2013 RT I had the rough idling, it would idle rough then race up to 3000 rpm then shut down. I had a faulty purge valve. To the OP if it is found that you have a faulty purge valve you need to insist that they replace the evap canister. Unless you like gas fumes and the risk of fire.

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After a cold start with white blueish smoke and rough idle and noisy clatter, I drive it for less than a mile and it clears up, my boost gauge will read 22 PSI MAX and it runs strong, like nothing happened. Starts rough, smokes a lot at idle and below about 1500 rpm but drives fine above.-
Jan 21, 2020 · Check Engine Light. You can then use a code reader to identify the specific problem, and then determine if that malfunction is what is causing the rough idle problem. The code may indicate the component, circuit or system involved in the fault. As a result, This gives you an additional advantage.
Problems: Maintenance, Warranty, Repair, Issues. 1-2 second rough idle on cold start up. Jump to Latest Follow 1 - 20 of 38 Posts. 1; 2; Next. 1 of 2 Go to page. Go ...

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Nov 13, 2002 · Rough idle on cold weather start I have a 91 GMC 2WD 350/TBI with 135,000 miles. When outside temp is below around 50 deg, the engine initially starts up fine, but runs extremely rough and will usually die if I don't bring the RPM's up a little. -
Oct 14, 2020 · I. Fix rough idle in the cold. Rough idle can happen during cold temperatures. For example, it is a cold day and you stopped at the stoplight. You press on the brake pedal to stop, however, the engine started to idle very roughly then stalls. But when you start the engine once again and drive the vehicle at higher speed, it's running fine or ...
Sometimes the fault is in the PCM or the inputs to the PCM. The factory programming may not provide enough idle speed when the A/C is on, when the alternator is under high load or when the temperature is extremely hot or cold. The fix here may be to reflash the PCM with the latest OEM update.

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Rough idle in park/neutral on cold start/restart Cold idle kicker enhancement. Running Change 3, available 2-24-03 Addresses: Rough idle in drive/reveres on cold starts Poor throttle response on cold starts Low power on cold start or after extended idling (may clear by cycling key) Harsh TorqShift engagement/2-3 upshift TorqShift 5-3 coasting ... -
What to Look For: A lousy temperature sensor results in rough idle during cold starts. Once warm, the problem may be less noticeable. Faulty Airflow Sensor – Like the temperature sensor, the airflow sensor helps your car know how much fuel to use, based on the amount of air in the engine.
today i talk to bmw engine specialist and he told me vanos has nothing to do with idle(or cold idle)issue.and they change vanos as whole unit they got secondary parts imported from japan and whole vanos costs approx. 25$. what about my problem he advised to clean throttle body,he thinks 90% it will cure this problem.

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When the engine is started cold, regardless of the outside temperature, the idle is rough and there is a noticable power loss. However, once the engine reaches FULL operating temperature the idle is smooth and power returns. During the rough idle, I notice the tach needle quivering and that the engine is revving lower than normal. -
My optimax runs great at anything above idle (idle in neutral, idle in gear, forward or reverse). At the lowest idle, it dies down and sometimes shuts off. I've been battling this problem for a couple of years and it has increasingly got worse. At first, only I would notice the rough idle. No one else could really hear it. Now it's painfully ...
Recently my car has started to idle roughly and stutter for the first 1-5 minutes depending on how cold it is and how cold it is outside. I think first step in fixing a car is to check for any fault codes. Could also be a bad HPFP too I guess.

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In order to fix this rough idle, replacement of the camshaft and lifters would be required. In the end the owner of the car decided to trade it against another used Mazda.To put things in prospective it’s not often you’ll find a worn cam shaft as the cause of your issue. Things like EGR problems are far more common. -
Rough idle, occasional cold start smoke, 987 .2 Starting to get a bit niggled by my 2009 gen 2 987, 41k old. i had some severe smoke on start up several months back which PCT fixed with a change of oil temp switch. smoke did go away. rough idle appears when cold warm or hot after, say, standing at traffic lights. never cuts out, rocks the car. car goes like stink or will do 36 mpg.
My main issue has been the Cold Start rough idling issue I've been experiencing for the past couple of months. They did not fix the issue with the cold start. I also plan on the doing a leak check tonight to verify that there are no leaks.

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New here form Australia! I purchased a boat with a 2005 - 225HP etec. It had 120 hours when I purchased it and now it has 183 hours. Ever since I had it, it starts quite rough at a cold start when I am at the ramp. What I mean by that is when I fire it up for the first time at the ramp, it idles quite rough and sounds like it is missing. -
I have a rough idle that started out of the blue. 04 excursion with 6.0. went out to start it one morning and it was a sluggish low rpm gross start. It used to fire right up like a champ and had the usually chug that smooths out once all the sensors sync up. Now besides the sluggish start it does not smooth out.

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I used carb cleaner to flush out most of the carbon. Next, use a Q-tip and carb cleaner or acetone and clean the air passages, springs, and plungers. You should unscrew the idle adjusting screw and clean all that as well. * Leave off the FICD solenoid, but put the idle adjusting screw back. -
Aug 01, 2020 · If too much air gets mixed in with the fuel, then this can cause the engine to misfire, resulting in a rough idle when cold, usually at a higher RPM. Spark Plugs . An engine that is doing a rough idle when cold can also be the result of faulty spark plugs or damaged spark plug wires. Spark plugs use the electrical current produced from the ignition coils to ignite the correct ratio of the air to fuel mixture within the combustion chamber in the engine.
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If you are experiencing a rough idle in an older vehicle with a carbureted engine, the process is a little different. Cleaning out the carburetor to remove carbon deposits is probably a good place to start. Then you should check all the vacuum hoses - a leaking hose can cause a too-lean mixture and a rough idle. -
Aug 29, 2014 · Weird issue with my Envoy (4.2L L6) the last two days. On cold starts first thing in the morning, the engine idles rough (like a single cylinder misfire) for about a minute then returns to normal. If you rev the engine whilst it idles rough, it revs smooth as glass. No codes are stored in the PCM.
Rough Idle at Start Up - Recall Repair 0012MC My dealer did the recall repair for 0012MC which calls for replacing tensioners and low intake manifold gasket. This fixed the problem (the rough idle was caused by a leaking gasket...the tensioner was a side item to replaced under the same recall).

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I have recently bought a 2006 Seat Altea 2.0 TDI PD with a BKD engine. The car starts perfectly and ticks over smoothly for approximately 2 mins before becoming very lumpy and rough whilst idling. The rough idle only stops after 5 mins driving when the engine warms up at which point car idles... -
Dec 08, 2009 · A Cold Start, Rough Idle FIX!! Discussion in 'Boxers/TR/M' started by kerrywittig, Sep 8, 2009. Page 1 of 3 1 2 3 Next > kerrywittig Formula 3. Rossa Subscribed BANNED.
I've noticed on a cold start, the car idles a bit rough while warming up just shy of 1,500 RPM. The RPM will dip a bit and I'll hear a pop sound from the exhaust. I'm sure this sound is exaggerated a bit with the axle-back. This normally happens a few times but once the car warms up and the idle settles below 1k, it runs normal.

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07 5.9 w/123k on it and am having rough idle issue upon cold start. Hard to believe injector/s are "tired" already. And staring down $300 a pop is a challenge. Anyone else gone thru the same problem? Truck has been awesome up until this point. Only other issue has been water pump... -
Oct 07, 2012 · Re: hard start when cold, rough and low idle If you have a multimeter I'd go check the voltage at the ECU while cranking and see if it drops below ~9 volts. A battery may have 12.8 volts at rest, but if it doesn't have enough CCAs the voltage will drop too low and the ecu will reset and loose the IAC position.
I am also having a cold start rough idle and stall problem on a 2004 170k miles 325xi wagon. I have found a crack in the intake boot where vac hose attaches and i reattached the maf boot that was loose when I bought the car a month ago. I runs well strong and smooth once it is warmed up.

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May 26, 2010 · Wondering if anyone with a XJR1300 2007 onwards model with EFI can advice if their bike runs smooth or rough on cold start? My 2009 model runs like a hairy goat at idle. She coughs and splutters with cold idle at about 1800rpm intermittently jumping to around 1500rpm and back to 1800 rpm before it smooths out after a minute or so then idles ... -
New here form Australia! I purchased a boat with a 2005 - 225HP etec. It had 120 hours when I purchased it and now it has 183 hours. Ever since I had it, it starts quite rough at a cold start when I am at the ramp. What I mean by that is when I fire it up for the first time at the ramp, it idles quite rough and sounds like it is missing.
In order to fix this rough idle, replacement of the camshaft and lifters would be required. In the end the owner of the car decided to trade it against another used Mazda.To put things in prospective it’s not often you’ll find a worn cam shaft as the cause of your issue. Things like EGR problems are far more common.

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Jun 01, 2019 · The Fix: Check and replace vacuum lines as required. The fuel pressure regulator may be operating at too low a pressure. The Fix: Check the fuel pressure with a fuel pressure gauge. Have your fuel pressure regulator replaced. Idle speed is set incorrectly. The Fix: Set idle speed to specs. There may be some type of ignition problem. -
Nov 30, 1999 · rough cold idle I recently performed the Terry Howe cleaning of the venturi cluster in the carburetor to fix a slow starting problem. At the same time I noticed the choke was sticking, and fixed that as well.

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Aug 29, 2014 · Weird issue with my Envoy (4.2L L6) the last two days. On cold starts first thing in the morning, the engine idles rough (like a single cylinder misfire) for about a minute then returns to normal. If you rev the engine whilst it idles rough, it revs smooth as glass. No codes are stored in the PCM.