1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

93 Old's Random Idle

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Old 03-02-2008, 10:29 AM
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Default Re: 93 Old'* Random Idle

Originally Posted by acidcrashdburnd
My friends thinks it has somthing to do with the 160 tstat i put in my car about a year ago he said it might be kicking into open loop or also the EGR could ..
Does a 160 thermostat work in these cars? I know some use a 180...

Could that be a factor here?
Old 03-02-2008, 10:32 AM
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Default Re: 93 Old'* Random Idle

Originally Posted by imidazol
Originally Posted by acidcrashdburnd
My friends thinks it has somthing to do with the 160 tstat i put in my car about a year ago he said it might be kicking into open loop or also the EGR could ..
Does a 160 thermostat work in these cars? I know some use a 180...

Could that be a factor here?
worst case scenario, short-term, the pcm wouldnt see temp it wants (iirc 130 deg F), and run in open loop, for longer.
Old 03-02-2008, 10:58 AM
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And while it runs rich for longer, it fouls out spark plugs, O2'*, and catalytic converters. Go back to a 180.

Running too rich for too long will affect your idle. I'm also concerned about you using brake cleaner on the MAF. It might be time to swap in a spare.
Old 03-02-2008, 02:05 PM
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Originally Posted by samueljackson
Originally Posted by acidcrashdburnd
Originally Posted by samueljackson
what did you use to clean the MAF?
TB cleaner then it was making it throw codes so then i cleaned it with brake cleaner
btw my abs quit working today i love my 93 money pit
thats your problem, you NEVER want to use something that aggressive on the maf. i have a couple extras that should work for you. can you post your oe # stamped on the part.
im currently not with my car but when i get home i will get the number for you
thank you!!
oh what should i clean it with?
Old 03-02-2008, 02:09 PM
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they make a cleaner specific for maf sensors.
Old 03-02-2008, 02:09 PM
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Default Re: 93 Old'* Random Idle

Originally Posted by samueljackson
Originally Posted by imidazol
Originally Posted by acidcrashdburnd
My friends thinks it has somthing to do with the 160 tstat i put in my car about a year ago he said it might be kicking into open loop or also the EGR could ..
Does a 160 thermostat work in these cars? I know some use a 180...

Could that be a factor here?
worst case scenario, short-term, the pcm wouldnt see temp it wants (iirc 130 deg F), and run in open loop, for longer.
hmm I have had no problems with the 160 tstat its been in for maybe 15 months now and it idles up when its around 200F+ so i dont think its the tstat but i will go buy and try one friday my next day off =D
Old 03-02-2008, 02:19 PM
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keep in mind, my explination was short term. pay attention to wren'*. if it has been there for more than a year, that could be the root of your problem.
Old 03-02-2008, 02:36 PM
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Originally Posted by samueljackson
keep in mind, my explination was short term. pay attention to wren'*. if it has been there for more than a year, that could be the root of your problem.
thank you for your help im gonna buy a 180 tstat and pop it in and see what happens..... i had put the 160 in i think 2 summers ago i cant really remember when i put it in to be honest but regardless i put it in for my air conditioning i was down to the bigger fan only the condenser fan died and i didn't replace it until September of 07 its hard when you work like me...
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