Where is the coolant sensor? Hard start, bad idle, etc. - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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.

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Old 02-08-2007, 02:20 AM   #11
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I would suggest checking fuel pressure too.
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Old 02-08-2007, 07:12 AM   #12
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check your ignition coils,plugs,plug wires.....article is in tech info at the top of the page
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Old 02-11-2007, 12:37 AM   #13
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Okay, so there are two coolant sensors in the lower intake manifold ... which one is for the PCM? Could you tell me EXACTLY where to find it? Thanks
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Old 02-13-2007, 10:10 AM   #14
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Well, we replaced the coolant sensor and no luck. BUT, we think we MAY have found the problem ... the MAF sensor. When we disconnected it, as we read to try in a post somewhere back, the car actually stayed running for over 30 minutes ... and, it did not smell real gassy, nor did it blow the black smoke out the exhaust, like it had been doing. We are crossing our fingers and hoping that if we replace the MAF sensor, this horribly elusive problem will be solved. Before we go out and buy one, though, can I ask if anyone has any advice on what brand to buy, or NOT buy? After checking, seems like they're quite pricey, and we don't want to get a bad one. Thanks again!
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Old 02-13-2007, 10:19 AM   #15
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Sounds like you found your problem. Good job! Just about any MAF should do, you may even be able to find a good one at the junkyard. If you want to be absolutely sure, the one from the dealer would be the way to go, but also the most expensive.
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Old 02-13-2007, 10:34 AM   #16
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Thank you, Archon! Will let hubby know when he gets home from work ... we are both anxious to do this ... and "hopefully" Bonnie will once again be a happy camper. Will test her out for a while, and post back with an update. Thanks again for all of your help!!
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Old 02-13-2007, 11:25 AM   #17
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Just to be certain, you could try cleaning the MAF before replacing it using this information from techinfo.

http://www.bonnevilleclub.com/forum/...e=article&k=64

If that doesn't do it, then you can do the replacement.
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