Intermitant Power Loss

WhidbeyRob

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Whidbey Island WA
#1
My '88 325iC has developed an intermitant problem where it loses all power under load. The engine does not stall, and will run normally at idle. Also, the engine will rev-up in neutral or with the clutch in, but will not develop any power or RPM under load. Typically, shutting off the engine and re-starting will temporarily clear up the problem, but it will repeat after a few minutes. The problem seems to be increasing in frequancy, especially after the engine warms up.
I have changed out the fuel pump relay, the idle position sensor, the fuel pressure regulator, and installed a rebuilt throttle body (mass air meter). None of these measures have taken care of the problem.
Any suggestions on what to try next?
Thanks.
 


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