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.

fuel economy issue

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Old 03-10-2005, 08:45 AM
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Originally Posted by jr's3800
When you get the O2 sensor, look at the bottom for a dark grey or almost black coating that should be on the threads as the AC Delco O2'* come with an antisieze coating already applied to the threads.. I have never has any problem removing one that was already coated from the factory..
I use this stuff (Anti-Seize) all the time. Especially on exhaust components where I KNOW that one day, I'll be doing this job again. You're right, it does make it much easier to remove the bolts(or sensor) the next time.
Old 03-10-2005, 11:17 AM
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My Bosch O2 didn't have the coumpound on it, but when it failed 30 days later, the AC Delco replacement did.

I also used an adjustable wrench. No problem.
Old 03-10-2005, 12:01 PM
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Originally Posted by vital49
AutoZone rents the special tool from the Loan-A-Tool program. You pay for the tool in full, use it, then return it to get a 100% refund. I've used it multiple times.
I've done this before. I may look into it this time as well.
If the anti-sieze is on my new O2 sensor I will just run with that. The stuff that'* on it will probably be the best for that sensor anyway.
Old 03-10-2005, 10:03 PM
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Don't forget to check the FPR. If the diaphram is ruptured, it will leak unmetered fuel into the intake.
Old 03-10-2005, 11:08 PM
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Had to ask: what is the best way to check one'* FPR [short of swapping it out for a new one] on a '93 SE?
Old 03-11-2005, 02:30 AM
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Pull the vacuum line off the FPR. If any gas leaks out, your FPR has failed, and needs to be replaced ASAP.

EDIT:
Does that last sentence remind anybody of PBR me ASAP? Just noticed that...
Old 03-12-2005, 11:17 AM
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Ive heard the easiest way is to run the car for awhile til its warm....and then remove the sensor...the heat warms up the threads and makes removal easier...but dont burn yourself!
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