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Xoutpost server transfer and maintenance is occurring.... |
Xoutpost is currently undergoing a planned server migration.... stay tuned for new developments.... sincerely, the management |
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#21
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Quote:
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#22
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Thank you for the reply.
I replaced the eccentric shaft motor seal. It had a small tear in the rubber. Checked the fuel trims afterwards; Additive - 1.2 and Long term - 0.0. |
#23
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That tear creates a vacuum leak. It will cause air to enter the crankcase and intake, bypassing the MAF.
Did replacement fix the rough cold starts? Fuel trims look good. |
#24
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Vacuum leaks can be an utter BEAR.... unless you are very familiar with the underside of a plenum on the model you have, it can be hard to ID where a cracked fitting or missing hose is or isnt..... (I have a gas S62, for 20 years, so know that well) It doesnt take much to throw the AFR off Other issue is that the 'size' of the air leak, in relation to the airflow into the engine changes as the RPM goes up. As a result, the DME is chasing the fuel trims around as the engine revs and drops. Decoding the short and long trims can be confusing. FWIW |
#25
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Replacing the eccentric shaft motor seal didn’t fix the cold start stumbling issue. In desperation I replaced all 6 injectors and - success! It never recoded a misfire on any particular cylinder so I have to assume all 6 were just worn excessively and leaking.
In this fiasco I replaced; Spark plugs MAF sensor Valve cover gasket Intake and throttle body gaskets DISA valves Evap valve Evap pump and canister Eccentric shaft motor and seal Injectors |
#26
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Where the injectors ever "tested" with 12 volts jumper ?
__________________
1988 325is (purchased new) sold 2004 X5 3.0 2005 X3 2.5 2008 X5 3.0 (new to me) |
#27
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#28
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Did you ever find the 'run-unrest' test on ISTA???
for example: https://www.m5board.com/threads/inpa...rest-s.199081/ Glad it was one of the injectors.... |
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