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87' 740 Has Intermittent Fast Idle When Up to Temperature 700

uid 4372's pic
posted by  bagle on  Thu Mar 14 14:42 CST 2002
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last visit: Sun Oct 28 00:26 CST 2001
[RELATED]

Is the electric radiator fan running at the same time when this happens? If so, then the EZ117K ignition control unit is doing its job. It advances the ignition timing when it sees an input from the radiator switch and the throttle position sensor is at the idle (throttle closed) position.
Normally, the LH Jetronic system's idle speed motor compensates for the increased idle speed caused by the advanced timing by reducing the amount of idle air going into the engine. The fact that your idle speed doesn't decrease means that A. base idle speed setting is too high or B. idle speed motor is bad. See 700/900 FAQ for base idle setting instructions.
HTH
Bob '87 745T






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