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General E46 Forum
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Old 09-08-2009, 10:54 PM   #1
EXNoodle
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Start-Up Issue

Ok, I have had a rough idle at start-up for the past 6-8 months.

I have done the following, it has helped, but it has not gone away yet:
-Fuel filter
-CCV (cold weather kit)
-Vanos seals, valve cover, cleaned ICV, cleanded MAF

Here is the current symptom:
At cold starts, I turn the key. The engine takes a bit longer to turn on, once on, it immediately goes into a rough 300-500 rpm idle. The second I tap the gas, the engine fixes itself and idles smoothly for the rest of the ride.

No fault codes on the PEAKE tool...

I have 88K on the car.

Anyone else have this issue, and if so, how did you fix it?
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Old 09-08-2009, 11:48 PM   #2
djlinux64
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Bad ECU flash? Clogged catalyst? I'm just throwing that out there.
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Old 09-10-2009, 07:07 AM   #3
chasz17
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Give this a try: Turn the key to on and wait 3 to 5 seconds. Then start the car. Please let me know if this helps.
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Old 09-10-2009, 07:19 AM   #4
Richy_Boy
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^ that wouoldn't eplain the rough idle, but my car doesn't want to fire up until the check light has gone out...

It might be soemthing like a leaking injector or possibly a valve seal i.e. fluid is leaking into the cylinder which takes a blip of the throttle to clear.

Rich
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Old 09-11-2009, 04:28 AM   #5
EXNoodle
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I will try the key thing today and let you know.

As far as something leaking into the cylinder, I have eliminated that as a possibility. If I turn the car on, and it goes into a rough idle, it will continue until i tap the gas. I have let it go in rough idle for as long as 30 second, after that i cringe and can not take it any longer.

I should also mention it does not happen all the time, but at least 3 times a week.

I will see how i can check the ECU flash and catalyst.

Could it have anything to do with the MAF sensor? I have cleaned it, but maybe it is going bad and a little jolt of air, from pushing down the gas puts it back in check? I have already taking apart and inspected the intake lines, clean with no cracks.

Does anyone now how to check a MAF sensor? Can it be done with a simple volt meter?
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Old 11-14-2012, 07:54 AM   #6
EXNoodle
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Richy Boy was right.... http://forum.e46fanatics.com/showthr...600&highlight=
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