Rough Idle
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Rough Idle
Hi everybody. I'm new here and I just bought my 2018 RS3 about 4 months ago. I have a doozy of a situation that I cannot for the life of me figure out. The issue is there is a very rough idle. I am running a stage two Unitronics tune and FBO. The issue has long proceeded my modifications though. Here are my findings so far:
- Both negative short term and long term fuel trims (STFT @-0.8 and -1.6) (LTFT @-7.8) at idle
- Negative spark advance @ -4.5 at idle
- High O2 sensor readings @0.77 volts
- Intake manifold/MAP vacuum @ 5psi
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AudiWorld Newcomer
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Adding some more info here... Just performed a compression test. All cylinders came in at 120psi (which is obviously way off from 170psi). Placing oil down into cylinders does not increase cylinder compression either which I'm guessing would point to a valve timing issue.
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