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No Power at High RPM 700

posted by  barnkat on  Thu May 28 08:42 CST 2009
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last visit: Fri Oct 21 14:45 CST 2011
[RELATED]

Hi All

Strange problem on my 1990 740GL Non turbo, Rex Regina. Car runs fine when cool. Once engine temp comes up, car bogs down, does not cut out, just loses almost all power. If you keep pushing it, it will pop occssionally out of the exhaust. Idles normal. No trouble codes. Plugs look normal.

I tested a couple sensors today. Air temp sensor OK, Man pres. sensor Ok. I was thinking maybe a clogged converter but I don't believe that would come on instantly and then have the problem disappear. Seems to go away when the air temp is lower or when the engine is below op temp.

What about the knock sensor? Any of you have that cause symptoms like this? I un plugged it this am when the problem occured and the car ran better, not normal, but better. Will be checking ignition timing tommorrow once I have my tools. Will also hook a vacuum gauge to it to test for plugged exhaust.

Anything else?

Thanks
Barry






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