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97 olds 88

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coppet
New User

Oct 19, 2006, 1:33 PM

Post #1 of 3 (3721 views)
97 olds 88 Sign In
My wife's 97 olds 88 has been misfiring. I had a diagnostic done at advance auto that said "multiple cylinder misfire detected". I have already changed the wires, spark plugs, and ignition coils. It's still misfiring and is barely driveable. Any ideas on what's wrong?


DanD
Veteran / Moderator
DanD profile image

Oct 20, 2006, 4:16 AM

Post #2 of 3 (3718 views)
Re: 97 olds 88 Sign In
There are a lot of things other then the ignition system that can cause a misfire.
 Low fuel pressure.
 Dirty injectors.
 Failing injectors.
 Excessive carbon deposits.
 Vacuum leaks.
 Evap purge system.
 EGR operation.
 MAF sensor out of range.
 Other sensors out of range (not enough to set codes but still out)
 Poor electrical connections.
 Electronic issues (computer)
Then we can start talking about engine mechanical?
All of these things can cause an engine misfire and all of which would need to be tested individually through a process of elimination.
Wish I had an answer for you but at times it’s a lot of legwork, experience and a whole lot of test equipment to find a misfire.
Dan.

Canadian "EH"






steve01832
Veteran
steve01832 profile image

Oct 22, 2006, 1:12 AM

Post #3 of 3 (3713 views)
Re: 97 olds 88 Sign In
I have a post in the Tricks of the Trade forum for multiple misfires. Might be worth checking out.

Steve





 
 
 






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