I'm totaly stumped! Help!!

[Dukernc]

Ok, so here's the latest situation! Brief history, back in Dec changed all plugs, installed new cops and used dielectric grease. Three week ago after 3,200 miles since new plugs & cops the CEL came on and no 4 cylinder was the culprit. Car ran fine but changed both plug & cop just to be sure. Last week did a 800 mile trip to the mountains and the car ran great. Now, last night on the way home from work the CEL comes on! Go to Advance auto and once again no 4 cylinder is the culprit!! All connections are tight so I'm at a loss! Does anyone have any suggestions? Again, the car is running fine except for the CEL. Thanks in advance for all the help!

 

[joegr]

Ok, so here's the latest situation! Brief history, back in Dec changed all plugs, installed new cops and used dielectric grease. Three week ago after 3,200 miles since new plugs & cops the CEL came on and no 4 cylinder was the culprit. Car ran fine but changed both plug & cop just to be sure. Last week did a 800 mile trip to the mountains and the car ran great. Now, last night on the way home from work the CEL comes on! Go to Advance auto and once again no 4 cylinder is the culprit!! All connections are tight so I'm at a loss! Does anyone have any suggestions? Again, the car is running fine except for the CEL. Thanks in advance for all the help!

Please post the exact five character OBDII code.

 

[Dukernc]

Please post the exact five character OBDII code.

I was not given the actual code. I was told that CEL was becasue of the problem with no.4 cylinder missfire. I'll have to go back to get it. Thanks!

UPDATE ok here's the code - P0304 = cylinder 4 misfire detected


Thanks Again!

 

[joegr]

You should also check the electrical connection to the #4 fuel injector.

Also, be aware that the PCM has to guess at which cylinder is misfiring. It sometimes guesses wrong. You should check all the other coils and plugs too.

 

[Dukernc]

You should also check the electrical connection to the #4 fuel injector.

Also, be aware that the PCM has to guess at which cylinder is misfiring. It sometimes guesses wrong. You should check all the other coils and plugs too.

Ok Joegr will do. Thanks for the heads up!