I think it's a vacuum leak - help me confirm
02-26-2018, 01:36 PM
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My Ride: M3
Model Year: 1998
I think it's a vacuum leak - help me confirm
Hey guys, I just finished a valve stem seal job on a friend's 2008 550i. Now, the car is running rough at idle and idles high (750 RPM). It's throwing codes for the EVAP solenoid, vanos intake and exhaust on bank 2, and cps intake and exhaust on bank 2. No lean codes.
Long-term fuel trims are at 2.3 and 0 for bank 1 and 2, short-term pegs at 25 for both banks. Goes down to 0 if I rev quickly, which makes me think it's a vacuum leak. MAF reads 6.5 g/s at idle, which I believe is normal.
I'm guessing I cracked the valve cover when installing it, what do you guys think?
Long-term fuel trims are at 2.3 and 0 for bank 1 and 2, short-term pegs at 25 for both banks. Goes down to 0 if I rev quickly, which makes me think it's a vacuum leak. MAF reads 6.5 g/s at idle, which I believe is normal.
I'm guessing I cracked the valve cover when installing it, what do you guys think?
03-01-2018, 03:45 PM
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My Ride: 07 550i Sports Package
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If its a vacuum leak it will idle rough on cold start then normal once the car is at regular temp. Also, listen for a whistling sound if its a vacuum leak.
Last edited by Gee_115; 03-01-2018 at 03:51 PM.
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