the car runs like shit when it warms up - Page 3 - 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 08-09-2007, 07:22 PM   #21
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5 qts of oil and some ring seal additive for my cylinders. The whole main issue with my car is this spark plug which I had a misfire with. I'm trying to find out why it happened. My car runs great with a new set of plugs but I can't change the plugs every week. One plug out of all of them contain more carbon, which I guessed gave me a misfire, I just don't know where it came from. Someone said that maybe it could be my seal. I only had this Bonneville for a year and it was barely driven until now. I know for a fact that this 15 year old motor couldn't be dying from me driving a couple of miles on low oil. That time I did drive low on oil I never raised the rpm'* pass 2000. I'm a long-term bonnie owner ever since I was 17, but I don't want to see this car go to waist. It'* crazy though, I get better gas mileage in the winter time?!?!?!
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Old 08-09-2007, 08:17 PM   #22
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92'* are not known for beating up Valve stem seals or killing off Piston Rings..

And the Fuel pressure range for you is 41-47 Psi... with the Fuel Pressure Regulator disconnected while idling ( cover the vac line with your finger when you pull it off ) You should see 43-47 Psi.... I'd expect 47-50 with no Vac at the regulator...

Right now as it stands you could have one of many problems..

Could have low fuel pressure, and running the tank that low is the worst thing you can do for the fuel pump... Fuel is both the coolant and lubricant for the pump.... Run it dry even for a split second and it can cause impending doom for the pump...

You could have a bad Valve Stem seal, But the 88-93'* are not know to have these issues..

Could have a Bad piston ring, But again I have yet to see a 3800 with a bad piston ring..

Could have a Bad Coil, Failing when hot causing the car to miss...

Could have a clogged cat, and the hotter they get the worse they get if they are clogging... I have no idea if thats an issue or not for you..

You could have a funky MAF sensor... Again hard to say...

Being its a 92 you could have the beginnings of a burnt valve.... Hard to say

At this point I am of no help

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Old 08-10-2007, 10:48 AM   #23
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You could even have a bad PCM. PeterG had a bad one and did everything else to try and fix it first. Ended up being a screwy pcm.

And yes...I do have one.
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Old 08-11-2007, 08:22 PM   #24
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Are you charging?
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