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Jumpy Idle - B7 RS4

Old 09-04-2016, 08:51 AM
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Default Jumpy Idle - B7 RS4

After 115K miles of pretty much reliable driving, I am starting to have to chase down an issue and need some input:

At idle, RPM's jump from 800 to 1200 then back down to 800 and up to 1200, over and over, consistent up and down.

If I take out the dip stick while this is jumpy idle is happening, the idle smooths out to almost perfect?

I checked the MAF on a 1st gear pull and it seems to be measuring correctly.

The adaptive results while the RPM's are up and down are:

Bank 1 (idle/partial)
-2.6% / 0.0%
Bank 2
-1.5% / -4.7%

The other day, I took out the dip stick for about a minute while the idle smoothed out.....I put the dip stick back in and the was still smooth The next 2 days the car seemed to be much more responsive and, the idle is jumpy again.

Upon COLD START - the initial idle is much higher than normal during a cold almost 2000 rpm's before it kicks down to lower RPM.

My gut tells me the oil separator may be kaput ??? Any other ideas?
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Old 09-07-2016, 03:41 AM
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I'd start looking around for a vacuum leak, especially under the manifold and as far back as the trunk (exhaust flap solenoid and reservoir). The easiest way is to spray a tiny amount of starter fluid or carb cleaner on the various suspects while the motor is idling and be alert to rpm increases.

Good luck and let us know what you find.
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