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Re: problem with 1990 750il European Model (archive)
[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]
Posted by peter on March 12, 2001 at 12:57:34:

In Reply to: problem with 1990 750il European Model posted by Richard L. Power on March 11, 2001 at 20:56:16:


Previous to this episode, I have been losing some oil that I could not find the source of the leak. My battery went down, and after having jumped the car the first time the car ran for just a short while, then retried with other car engine on for extra power - which the car finally started after about10-12 seconds of cranking. The car ran rough and the OEM light on dash came on. Felt as if car was running on 6 or less cylinders. No power at all. Took forever to get to highway speed. Installed new battery, the OEM light goes off - I have power now but heavy smoke comes out the tail pipes. Anyone with idea what went wrong and what needs to be done to fix it. Tune up - new spark plugs and wires? I think oil is leaking from a valve cover, but does not look like a lot - nothing shows from the bottom of the engine.????? Will gladly accept any advice on what might be wrong.
Thanks Richard


Richard,
I have had similar symptoms in an e23 as well as on my e32 but the cause was different.The fuel pressure regulator went bad and the car ran rich and rough until it was replaced the next day at the garage. On the e32 the O2 sensor cable had gotten fried by the exhaust and was sending a lean signal to the computer..resulting in rich mixture (black smoke) and rough idle. It seems strange that his should only occur after you lost battery power. I don't think the oil leak is to blame.

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