Mtcr01
#1
Mtcr01
I have a 98 3.8 and have been having a problem with the engin missing. It runs great 99 % of the time. What happens is when you are speeding up slowley the engin will miss once in a while. I took the car on a trip where it was very hilly and every time I would go up hill it would miss the bigger the hill the worse it got. I have had the check engin light come on a few times and all it said is #4 cyl. had missed. I did change the fuel filter but have not done anything else. Any help on where to start or what to look for sure would be nice. Thanks
#2
Senior Member
True Car Nut
Check spark plugs, wires and coils, paying particular attention to cylinder #4.
https://www.gmforum.com/t278818/
If you suspect a coil, switch the coils around and see if the problem moves with the coil for cyliner #4 (do you have a scanner?).
In the dark, with the engine runnin, in park. high revs ... mist the engine compartment with a spray bottle of water and look for blue sparks (electrical arcing). This may tell you if a plug or wire is arcing to ground.
If you haven't changed plugs and wires, I would start there.
If plugs, wires and coils are all okay, switch the fuel injector from cylinder #4 with another cylinder and see if the misfire moves with the injector.
My guess is the plug wire or spark plug on cylinder #4.
https://www.gmforum.com/t278818/
If you suspect a coil, switch the coils around and see if the problem moves with the coil for cyliner #4 (do you have a scanner?).
In the dark, with the engine runnin, in park. high revs ... mist the engine compartment with a spray bottle of water and look for blue sparks (electrical arcing). This may tell you if a plug or wire is arcing to ground.
If you haven't changed plugs and wires, I would start there.
If plugs, wires and coils are all okay, switch the fuel injector from cylinder #4 with another cylinder and see if the misfire moves with the injector.
My guess is the plug wire or spark plug on cylinder #4.