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Re: base idle adjustment 700 1988

posted by  someone claiming to be David Hunter on  Tue Dec 5 14:24 CST 2000 [RELATED]

I have an 88 740. the wire is on the passenger side suspension tower. There is a connector their with 2 wires. Its the red and white one. Just jumper to ground, then adjust base idle to 700RPM. This is not too critical so you can just use use the dash tach. With jumper disconnected ECU should maintain idle at 750 and 900 if AC is on.

BTW its a little known fact that the other wire in the connector which is green and white is a test point. If O2 sensor/ECU/air mass meter and mixture are all OK it goes high low every second or so. The mixture screw on the AMM is adjusted to achieve this status. If high (12V)you are rich, low is lean, flashing is just right.

Good luck





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