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Car Shaking/Check Engine Light/High RPM on idle

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Old 04-30-2012, 08:29 AM   #1
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Default Car Shaking/Check Engine Light/High RPM on idle

So this happened in a short time period. Over this past weekend I was driving my car and at stop lights I noticed the car was shaking, it went away when I accelerated. Then when I woke up this morning my check engine light came on and the shaking of the engine was worse. The engine seems to be louder than usual. I drove immediately to auto zone and got the following codes:

P0300 - random misfire
P0301 - Cylinder 1 misfire
P0302 - Cylinder 2 misfire
P0303 - Cylinder 3 misfire
P0304 - Cylinder 4 misfire
P0507 - Idle Air Control System RPM higher than expected
P0171 - System too lean (Bank 1)

When the car is in motion everything seems fine except for the check engine light being on.

Any ideas?
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Old 04-30-2012, 08:31 AM   #2
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I changed the ignition coils and spark plugs when the recall happened about 2 or 3 years ago. I also need an oil change and I will be doing that any day now.
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Old 04-30-2012, 08:32 AM   #3
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Also I changed the timing belt when I had 90,000 miles, I now have 156,000 miles.
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Old 04-30-2012, 09:35 AM   #4
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That sounds more like a vaccuum or intake leak.
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Old 05-01-2012, 03:46 PM   #5
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Default Hmm

Sounds like a PCV issue. I had the exact same problems, misfire at idle along with all those misfire codes. Have a reach under and check all the pcv lines and hoses. Turns out the one connecting to the oil filter was disintegrating as when we pulled it off it literally crumbled.
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Old 05-01-2012, 03:57 PM   #6
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Sounds like a some sort of VAC leak, I agree with lyleswk.

Check your suction jet pump...(do a search for the item, because I don't have any photos)
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Old 05-07-2012, 05:59 PM   #7
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Gentlemen,

Thank you for the replies. It was a vacuum leak. I had a mechanic replace the black plastic valve, cost me $180. I think I got off easy. Car runs like brand new. I hope my audi lasts forever.
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