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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 01-28-2009, 12:20 PM   #1 (permalink)
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02 525i auto, service engine soon, misfire

history first. I had the car detailed and they pressure washed under the hood (without my knowledge). Soon after the "service engine soon" light came on. There were no secondary indicators of trouble at that time. A few days later I noticed the car would start to misfire if it idled for more than 5 minutes or so. I could correct the problem by turning it off and restarting it. Once it started to misfire, if I drove it without turning it off and on again, it would continue to misfire, like it had dropped a cylinder. Under normal driving it seems to drive fine as long as I don't let it idle for a while prior. I've also noticed that there is a "hissing" sound coming from under the hood now. It seems to be coming from the left (driver) side and does not change in pitch with engine rpm changes, it stays constant, and slowly diminishes over about 3 or 4 seconds after I shut the vehicle off.

I'm stumped, any clues would be greatly appreciated.

Derek
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Old 01-28-2009, 12:28 PM   #2 (permalink)
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I would say MAF or your camshaft sensor.

Disconnect the Maf and see if it makes any difference if NOT its shot.
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