I have a 91 olds ciera that has misfire...changed plugs and wires

Greg Bernett

• 2993 Answers
• Posted on Mar 10, 2009

SOURCE: 1993 Oldsmobile Cutlass Ciera S 6 Cyl 3300 Speed Problem

Yep...try replacing your coil pack....

Harvey N Tawatao

• 3854 Answers
• Posted on Aug 20, 2009

SOURCE: 93 olds cutlass supreme 3.1 M model engine. for

Check the MAP sensor and the fuel pressure regulator, start with that and also cleaning the throttle body will help also. Make sure you use throttle body cleaner, carb cleaner is to corrosive to the throttle body gaskets. Good luck and hope this helps. Keep me posted,be glad to get your car running 100% again soon. 

SOURCE: po300 multiple misfires.I have changed the coil

reset the ec module by disconnecting the battery for a few minutes. If that does not work have autozone do a free scan and ask them to reset the codes.

SOURCE: 1991 olds Cutlass Ciera. 3.3l, failed the NO

Since your cat was replaced you should be looking at fuel problems...even gas cap seal....check fuel pressure,fuel regulator,and evap system.>canister or purge solinoid,o2 senser...high nox is caused by the cat or fuel problems on these engines...high pressure in the combustion chamber...lean condition>air leak on hoses,or high compression caused by carbon build up ...there is no EGR on this car so don't waste time looking for it...hope this points you to your problem

SOURCE: I have a 2000 olds

i think if you take it to autozone or advanced auto they can test it but how long has it been since the wires were changed