1990 bonneville will not idle

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Frustrated1
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Year and Trim: 1990 Bonneville Le

1990 bonneville will not idle

Post by Frustrated1 »

I have replaced the icm,tps,crank sensor( hope is in right watched a lot of videos) also replaced cam sensor and wiring harness that goes to all of those. Tach does not work. Car will run at a higher rpm but will not idle. Please help anyone.
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J Wikoff
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Re: 1990 bonneville will not idle

Post by J Wikoff »

Try unplugging the MAF and see if the behavior changes.

Are there any other symptoms, trouble codes, sounds, etc?
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MattStrike
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Re: 1990 bonneville will not idle

Post by MattStrike »

A few other things that could cause poor idle are EGR stuck open and vacuum leaks.
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96 SSEi
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Re: 1990 bonneville will not idle

Post by 96 SSEi »

YES, UNPLUG THE MAF SENSOR AND SEE IF IT IMPROVES. then you can check the IAC IDLE AIR CONTROL. if that fails, it would cause your issue.
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retroren1
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Re: 1990 bonneville will not idle

Post by retroren1 »

I had this same issue on my '90 bonnie and it was the iac.
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