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Recently had my air oil seperator replaced. At start ran a little rough now runs super rough and wants to stall. Changed 2 pre cat o2 sensors and mass air flow sensor. These are the current codes, 0112, 0300, 0301, 0302, 0303, 1316, 0102, 0130. Prior the car ran perfect and I cant believe I have all those cylinders misfiring because of plugs or coils. Please help

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A lot of top engine stuff needs to come out to replace the AOS.  I would first check carefully the oil filler pipe for cracks.  It usually cracks where the corrugated section starts. Make sure the oil cap is on tight.  Since the front and back intake plenums are removed during AOS  replacement, check the plenums for centering and all the clamps are tight.  Then you need to start checking the vacuum lines, and there are a lot.  You might need to smoke test the vacuum system and intake system.  A lot of times someone forgets to reconnect the vacuum lines, particularly the one to the resonance flap on rear crossover plenum, and the other ones (two) to the back of the front plenum.


vacuum lines.pdf

Edited by DBJoe996
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The OBDII codes are indicating an intake air leak or vacuum leak, resulting in misfires P0300-P0303, P1316...probably.  Since you have already replaced the O2 sensors and MAF sensor you can rule those out.  It could be coils/plugs, but all at once and on Bank 1 and cylinder 4?  Does not seem likely.  How old are your coil packs and plugs?  First rule of mechanics...always go back to the last thing you did.   AOS replacement is a huge job requiring removal of a lot of things.  Suggesting it may be something left unplugged or not reconnected right during the job.  Sounds like you had a shop do the AOS replacement.  Could you take it back to them for diagnoses of the current problems?  Did you check the oil filler pipe?  It has to be contorted many times out of the way during AOS replacement.

Edited by DBJoe996
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