Having problems with your 2003 BMW 330 ?

My 330CI BMW won't start and the batter seems good.

\015 I live on the east coast and we just had snow and a lot of rain. I have not driven my car for 2 days. I started my 330CI 2003 BMW this morning. The engine turned over, the car ran for 1 second and then died. I tried to start it again, but the lights flashed, the windshield wipers turned on, the engine clicked, but it did not turn over. I left it alone. For the past few months, my car has been running rough off and on.\015 Posted / edited by AnonymousUser on : 23-10-2017

Answers :

Could be a wet ecu.
\015\012i have an e36 and these units get wet and fail, false readings, sliggish performance...till they blow up...
\015\012
\015\012check the notes below
\015\012
\015\012the ecu compartment is under the windshield on the passenger side on E36
\015\012
\015\012you gain acess to it under the hood....
\015\012this compartment gets wet, the ecu lays on a flat surface in that
\015\012compartment.
\015\012
\015\012the bottom side of the circuit board gets wet and starts corrosion.
\015\012
\015\012remove the ecu, take the bottom plate off, clean the bottom of the circuit
\015\012board with alcohol and a soft tooth brush.
\015\012
\015\012you should be able to see the signs of corrosion or conductive build up.
\015\012
\015\012this gunk bridges solder points doing all sort s of wierd things to your
\015\012car, including false sensor readings from asc/abs controllers and other
\015\012sensors....
\015\012
\015\012all the way to engine failure and worst case burnt and shorted wiring
\015\012harness.
\015\012
\015\012I'm on my 3rd ecu, took me and the repair boys a few years to figure this
\015\012one out.
\015\012
\015\012BTW: i would get that ecu mounted above that flat surface, use some sort
\015\012of standoff to raise it so that it is not laying in the wet.
Repair Help & Product Troubleshooting for 2003 BMW 330

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