99 SLE misfire problems - 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 08-21-2006, 08:38 PM   #1
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Default 99 SLE misfire problems

I have a 99 SLE bonneville, non-supercharged. I have a check engine light, which I got scanned at Auto Zone, which gave me a "general" ignition fault code. My bonneville, misfires around 25 to 30 mph, and is running slightly above the usual RPM'*. For example it usually is about 2100 RPM'* at 70mph, but it is doing about 2400 RPM'* instead, killing the mpg'*. Any help would be appreciated, I did own a 91 Bonneville before and changed the electronic package (like a distributor), and that fixed it, but I wanted some feedback before I try that route.
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Old 08-21-2006, 11:16 PM   #2
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When'* the last time you did a full tune up? Plugs, wires, o2 sensor and fuel filter? Plugs and wires will likely take care of it. Don't buy Bosch parts. Stick with AC Delco, if possible.
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Old 08-22-2006, 12:54 AM   #3
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if you have a misfire or a multiple misfire the Check engine light will be flashing.... we need to know what cylinder or cylinders the misfire is....

coils
plugs
wires

are the first things to check
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Old 08-22-2006, 01:07 AM   #4
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Default Re: 99 SLE misfire problems

Quote:
Originally Posted by srirachasauce
I have a 99 SLE bonneville, non-supercharged. I have a check engine light, which I got scanned at Auto Zone, which gave me a "general" ignition fault code. My bonneville, misfires around 25 to 30 mph, and is running slightly above the usual RPM'*. For example it usually is about 2100 RPM'* at 70mph, but it is doing about 2400 RPM'* instead, killing the mpg'*. Any help would be appreciated, I did own a 91 Bonneville before and changed the electronic package (like a distributor), and that fixed it, but I wanted some feedback before I try that route.
Where in FL are you located?

And you need a better definition of the codes that are stored in the computer... Such as P0xxx or P1xxx this will give us a better idea of what the computer is looking at and what fault it sees as well as giving us a direction to go in

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