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RPM surge 700 1990

posted by  Rludwick on  Sat Oct 30 11:21 CST 2004
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last visit: Sat Aug 31 16:10 CST 2013
[RELATED]

I'm posting this for a relitive with a '90 740 b230f .
The thing is now idling fine, but when just above idle, the rpms start surging like crazy up and down.
So far he's replaced just about everything sensor wise, AMM, idle valve ( it tested bad), speed sensor , tps , fpr, etc.
He's replacing the tank fuel pump now , and is almost at wits end. Not much left to replace aside from the ECU and ignition computer.

The car is about 1900 miles away, so I can't see it first hand.

Any thought here?

Thanks------Robert
--
-------Robert, '93 940t, '90 240 wagon, '84 240 diesel (she's sick) , '80 245 diesel, '82 Mercedes 300SD






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New RPM surge [700][1990]
posted by  Rludwick subscriber  on Sat Oct 30 11:21 CST 2004 >


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