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Old 11-24-2013, 11:09 AM   #1
haz
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Rough idle when warm, anyone knows why?

Only when warm, not when cold, its chasing when idling. Anyone? (Replaced MAF 3 weeks ago, and this problem just arrived..)

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Old 11-24-2013, 11:24 AM   #2
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I am thinking, vacuum leak. Did you check to see if the AOS is good. Also, was this an issue before replacing the MAF.
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Old 11-24-2013, 11:32 AM   #3
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I'm considering vacuum leak also. How do I check the AOS? No, this problem arrived friday and only when warm.
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Old 11-24-2013, 12:17 PM   #4
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Quote:
Originally Posted by haz View Post
I'm considering vacuum leak also. How do I check the AOS? No, this problem arrived friday and only when warm.
When the engine has warmed up, try removing the oil filler cap. If it does not unscrew and remove easily then the AOS is not working as should. Then replace it. Are there any codes being thrown?

I usually work backwards...put the MAF back on and see if it has the same problem. If not then put the new back on and make sure it is seated correctly...you also could have a bad part.
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Old 11-24-2013, 09:46 PM   #5
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Just a thought, did you disconnect the battery before you put the new maf on ? this will allow the on board computer to learn all the settings from new, it may be working on the old maf settings.
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Old 11-24-2013, 11:14 PM   #6
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Quote:
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Just a thought, did you disconnect the battery before you put the new maf on ? this will allow the on board computer to learn all the settings from new, it may be working on the old maf settings.
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No, but the new has MAF worked fine. It did not throw any codes either after new MAF + the car has the new software (this newest MAF requires it).

Quote:
Originally Posted by jcb986 View Post
When the engine has warmed up, try removing the oil filler cap. If it does not unscrew and remove easily then the AOS is not working as should. Then replace it. Are there any codes being thrown?

I usually work backwards...put the MAF back on and see if it has the same problem. If not then put the new back on and make sure it is seated correctly...you also could have a bad part.
I will connect the casr and check for codes on saturday, as I was planning to visit my friends Porsche-garage anyways. I will also check your "unscrew the oilcap"-trick after work today also

Thanks so far guys!
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Old 11-25-2013, 11:15 AM   #7
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Someone tipped me it could be the "idling regulator" (if dat is de engrish wrd for eet)
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Old 11-25-2013, 11:57 AM   #8
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Try cleaning the throttle body.
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Old 11-25-2013, 12:22 PM   #9
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Thanks! Added to my check list for this saturday

Will also check the Idle speed control valve.

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