Question about 1999 BMW 328 Series

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I have an 328i if let idle it runs ruff

I have an 328i it runs out go at times it cuts back or if idle long its began to start running ruff

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Could be a number of issues. like crankshaft position sensors, mass air-flow....but i like to look at the central problem first...the ECU

the ecu compartment is under the windshield on the passenger side on E36

you gain acess to it under the hood....
this compartment gets wet, the ecu lays on a flat surface in that
compartment.

the bottom side of the circuit board gets wet and starts corrosion.

remove the ecu, take the bottom plate off, clean the bottom of the circuit
board with alcohol and a soft tooth brush.

you should be able to see the signs of corrosion or conductive build up.

this gunk bridges solder points doing all sort s of wierd things to your
car, including false sensor readings from asc/abs controllers and other
sensors....

all the way to engine failure and worst case burnt and shorted wiring
harness.

I'm on my 3rd ecu, took me and the repair boys a few years to figure this
one out.

BTW: i would get that ecu mounted above that flat surface, use some sort
of standoff to raise it so that it is not laying in the wet.

Posted on Feb 07, 2010

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I have an 328i if let idle it runs ruff


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Firstly clean the air filter as it seems that the engine is choking.
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