Asked by Feb 02, 2012 at 05:10 PM about the 1990 Oldsmobile Cutlass Supreme 2 Dr International Coupe

Question type: Maintenance & Repair

I have a 1990 Oldsmobile Cutlass Supreme WITH  misfire on cylinder 2 and 5. I replaced plugs wires and Coil also crank sensor. I still have the misfire. the engine is a 3.1L. There is no engine light and it runs rough when in gear going to stall. I had the module tested and Im about to pull my hair out. I like this car. so I want to ask someone else if they have any problems. I basically repaired all the igntion side. what could be telling cylinder 2 and 5 not to fire? and Im sure the Coils are good. and all the parts. If someone out there can give me a hand that would be greatly appropriated  

6 Answers


I guess we dont have any good Oldsmobile technicians out there.

1 out of 1 people think this is helpful.

check you coil take a plug and put on wire see if there is spark then also check compression see if you have weak compression hope that helps

1 out of 1 people think this is helpful.

Do you hear any ticking? The rocker arms will pull out of the cylinder heads that will cause a miss fire, if not check your ignition module that controlls voltage to the coils.


I replaced the module and it ran fine for a month and on the way to work the car ran bad. but did not set a code! the next thing Im going to check is 02 sensor. I have been going to school and been getting alot of knowledge about being a tech! so Im going to check the wires that go to the ecm. and go from there!


Check your fuel injectors, that is most likely the problem...

1 out of 1 people think this is helpful.

Check out your fuel injectors, you can OHM them out using a volt meter switched to ohms, cylinders 2 and 5 aren't on the same coil pack so those may be ok however they also could be bad but these cars have a bad fuel injector problem, lookup technical service bulliten on this for your vehicle, also have your fuel pressure tested to rule out fuel pump/filter problems

1 out of 1 people think this is helpful.

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