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Intermittent stalling / rpm surge 240-260 1987

posted by  someone claiming to be Brent Avery on  Mon Apr 27 10:09 CST 1998 [RELATED]

ICQ>11571282

An intermittent running problem has been occuring & I suspect it could be

the fuel pump relay. From what I've read & heard the relay usually just quits

but a friend's 1986 760 Turbo had the same symptoms - it would either stall

but start up immediately, or the engine RPM would suddenly surge to

between 2 - 2,500 and back down to idle then run normally or stall again.

This cycle would repeat itself and then disappear . I disconnected the

air mass meter when it was acting up and the problem went away- plug it

back in and the problem was back again. I did it once more and the

engine RPM increased,but not as dramatically. I've tried 3 different

relays ( all used & '87 vintage ) and only one worked well - for a while.

Could it possibly be a sensor ? I should mention that the AMM was

replaced 2 mos. ago. The relay is a double contact type & I gather

it is tied into the AMM & either the idle air valve or the throttle switch.

I disconnected the AMM while the engine was running ( found out that

it's a no-no ) since it still runs well except for this one problem I'm

hoping I didn't do any damage.





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