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Engine Misses Between AC Compressor Cycles 700 1992

uid 5559's pic
posted by  Guid on  Fri Jul 25 06:22 CST 2003
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last visit: Thu May 9 12:04 CST 2013
[RELATED]

My '92 745 (non-turbo w/Rex-Regina Ignition) tends to misfire between AC compressor cycles. This translates to brief, quick surges at highway speed. I have recently replaced plugs, wires, coil wire, distributor cap and rotor, air filter (It was time for all of these anyway). No effect. Then, I read the FAQ, which seemed to point to the knock sensor. I replaced it with a new one. No effect.

While in neutral with the AC on and engine at about 2500 rpm, the compressor cycles in and out normally. While the compressor is in its "off" cycle, the car will lightly misfire 2-3 times, clearing up again when the compressor is in its "on" cycle.

Again, the problem occurs only with the AC switched on. What the heck? I was thinking of checking for bad connections on the knock sensor connector.

Any thoughts? Thanks in advance.

--
Guid ('88 244DL 231k, '92 745 180k)






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