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Weird airflow meter-type problems, HELP! 700 1988

OK, got a question for all you experts...

Car is a 1988 745 turbo. Just dropped in an '89 motor and tranny. Ran great for a week, ran great on my way to work this morning. Then, I came out to go to lunch, didn't want to start. Acted like a bad airflow meter, running rich (once it did start), wouldn't accept hardly any throttle, etc. ran exactly the same when I unplugged the a/f meter, basically. So, I think, damn a/f meter has crapped out. I've had several do the exact same thing in the past on different cars. So I swapped one in from another car, that I knew to be good. Same result, ran like crap, hard starting, no throttle response, etc, etc. BUT after I let it idle for a minute or 2, idle smoothed out... I cracked the throttle, and, VOILA! Ran perfectly. So, out of curiosity, I hooked back up the first a/f meter, and it STILL ran perfectly. OK, a fluke, I figured. So I drove to lunch, came back out, same drill. I had the extra a/f meter with me, so I switched them around again, no help. I managed to drive back to my shop very slowly in limp-home mode with meter unplugged. When I got back, out of curiosity, I re-plugged the a/f meter, IT RAN PERFECTLY AGAIN!!! WITH BOTH METERS!!! ARRRRRGH!!!!!

Ran fine to drive home a few hours later. I'm concerned because I was gonna take a 2.5hr. road trip for easter, but don't want to be stranded.

Anyone have any ideas where I should start? Anyone ever have a similar problem?

Any help would be greatly appreciated, THANKS!

Brian Flanagan








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Weird airflow meter-type problems, HELP! 700 1988

My guess: The connector on the harness that plugs into the air mass meter is corroded or dirty. Disconnecting and reconnecting it when you swapped the air mass meters "cleaned" it enough so that the car would run. Temporarily. I believe that there is info in the 7/900 FAQ on how to clean this connector. If not, try searching the archives.








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Weird airflow meter-type problems, HELP! 700 1988

Brian,

If the problem was constant, I would suspect an air leak on the intake side or a bad fuel pressure regulator. Since the problem comes and goes intermittently, the idle air control valve could be sticking. Next time it's running poorly, whack the IAC with a stick. If the idle smooths out, you've got it. The 700/900 FAQs explain how to clean the valve side as well as how to disassemble the motor and clean the commutator. Look under "Engine Tune and Performance; Symptoms". Let us know what the final fix is.

Regards,
Bruce







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