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1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-12-2003, 11:29 PM   #1
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Default Idling issues

(Before reading, note that PCM is reporting camshaft sensor circuit failure but car rarely exhibits sputtering-at-accelleration associated with this.)

When sitting at a light, the engine normally idles at about 750RPM, after it is warmed up. For the past 1-2 weeks, every so often the tach will report between ~600 and 1000RPM - the engine will oscillate back and forth in this range, completing a full cycle between 600 and 1000RPM every 1-2 seconds. It does not always do this, and I cannot attribute any specific circumstance.

What controls the idling speed? Is it the PCM in this car? Would a simple clearing do the trick?
--
1988 Bonneville SSE
300,400km
Stock + CD player. Why mess w/ a good thing?
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Old 04-13-2003, 01:28 AM   #2
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Default Re: Idling issues

Quote:
Originally Posted by lazicn
(Before reading, note that PCM is reporting camshaft sensor circuit failure but car rarely exhibits sputtering-at-accelleration associated with this.)

When sitting at a light, the engine normally idles at about 750RPM, after it is warmed up. For the past 1-2 weeks, every so often the tach will report between ~600 and 1000RPM - the engine will oscillate back and forth in this range, completing a full cycle between 600 and 1000RPM every 1-2 seconds. It does not always do this, and I cannot attribute any specific circumstance.

What controls the idling speed? Is it the PCM in this car? Would a simple clearing do the trick?
--
1988 Bonneville SSE
300,400km
Stock + CD player. Why mess w/ a good thing?
When mine did this on my 87, it was a loose TPS. Two bolts had loosened off, letting the TPS to move it'* postion & set the idle speed higher than normal.
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Old 04-17-2003, 03:33 PM   #3
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Default MAF sensor

Could also be your MAF sensor is bad. Have you cleaned your throttle body lately??
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