Thnx Volvo Spark plugs fix the problem! Runs perfect!! And i couldn't be happier! Thank you for your help!!

im the tech working on the s40 volvo, swoped coils stays on cyl. 3, swaped injectors stays on cyl. 3, checked flywheel pulse wheel windows checked good mass air sensor good,checked timing belt checked good, check compression on all cyl. 175psi, check leakdown on all cyl. check good replaced spark pl...

he said hes done that coils are fine. new spark plugs. Everything was fine with the car then i got a check engine lite for the cat thats when i felt a chug in the engine when i accelerated fast, other than that it ran perfect except i noticed instead of 300 miles + to a tank i got 200 or less took i...

I was told its a cylinder 3 misfire?

i don't know the code right now but i can get it tomorrow from my mechanic but hes at a loss of what its is and hes not familiar with volvo. but from what ive read here and there seems like the s40 is has a lot of issues.

I have a Volvo 2002 S40 with 92,000 miles on it. i just replaced the CAT and its still misfiring. The spark plugs are good and I am unsure of what else could be the problem. The code for the CAT keeps coming up. Doe anyone have any ideas. I honestly don't know anything about cars.