89 740 GL starts and idles fine until warm.

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Old 09-27-2020, 12:22 AM
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Default 89 740 GL starts and idles fine until warm.

Then idles speed +-750 rpm climbs to about 1400 rpm. Has new rotor and dist. New plug wires and iridium plugs. New fuel pressure control valve. New IAC, brake booster and maf. Runs great other than the fast idle and it's a little bit harder to start when warm... Engine temp sensor maybe? Any help appreciated. Thanks

 
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Old 09-27-2020, 11:35 AM
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Default 740

Change/ adjust/ replace your throttle position sensor!!!
 
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Old 09-27-2020, 01:14 PM
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Originally Posted by Goldenblock
Change/ adjust/ replace your throttle position sensor!!!
OK. Ordered. Should be here next week. Will advise. Thank you.
 
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Old 09-27-2020, 06:44 PM
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i would have tested it, its a simple switch, closed when the throttle is at idle, open otherwise.
 
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Old 10-03-2020, 10:14 PM
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Originally Posted by Gary62
OK. Ordered. Should be here next week. Will advise. Thank you.
Thanks Goldenblock. Replaced TPS and its running smooth. No RPM change from idle. With 350000 km, now its ready for another 350000! Thanks again.
 
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Old 10-04-2020, 10:58 AM
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Default 740

Your welcome!! Sometimes people over compensate with too many words to diagnose.... Glad its doing well
 
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