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erratic idle 700

posted by  benton33 on  Sun Apr 11 11:06 CST 2010
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last visit: Thu Jun 27 20:53 CST 2013
[RELATED]

I have a 88 740 turbo manual with 225000 miles. I am having the same symptoms as N7SC. The idle is very erratic going from near stall to 1500 or 2000 rpm eventually evening out at 800rpm a little warm. Going into a stop in nuetral the idle will always drop to near stall and then jump high. There is also the sucking or hissing noise in the engine compartment. So far I have changed all vacume lines, cleaned Idle Air Valve, tested and cleaned MAF, replaced the engine temperature sensor, cleaned the throttle body, and installed new o rings on the injectors. Any advice would be appreciated. Ive been working on this problem for a while now.






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