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UPDATE....new clue!
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Posted by AP [Email] (more from AP) on Sat, 1 Jun 2002 14:06:46 Share Post by Email
In Reply to: Broke down on the road TODAY!! <long>, AP, Fri, 31 May 2002 22:59:49
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I ran through a bunch of tests in the bently, and as far as i can tell now, i have strong spark. I have ruled the possibility of an ignition problem out. Im fairly convinced i have a fuel problem.
I attempted to read the check engine fault codes from the controll unit, but i never got it working even though i follwed the bently instructions exactly. Next i checked the voltage signal at the fuel injectors. I took injector #3's harness off and hooked up a multimeter, i started the car and it ran good like it always does after sitting for an hour or two. I let it idle and i had a fluctuating reading between .400 volts to .500 volts, normal according to bently. I left it hooked up and running anticipating an upcoming problem, well at about the usual time it stops running the voltage read out at the injector dropped to .020-.040, about 1 second later, the engine began running incredibly rough and stalled 1.5 seconds later. The normal even i have been dealing with.

This is a very interesting experiment and im not sure what it means. Why do i only experiance problems after it runs for about 5 min. Does it have something to do with going from closed loop to open loop? thats all i can gather. im left wondering if maybe im dealing with a serious O2 sensor problem. And that once it reaches 600degrees and the ECU begins using its signal rather than the pre-programed values the O2 sensor says the engine is too rich and the ECU severly cuts voltage to the injectors.

what to make of it all??
thanks
austin
1991 900S

posted by 172.166.22...
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