MeAndMyPenguin
Member
- :
- 2002.5 Mazdaspeed Protege5
Okay, I have 2002 Protege5 with around 130,7XX miles. Its been running fine since around 120K miles and recently it started to misfire. The CEL came on and cylinder 4 was misfiring. After installing new spark plugs, the car still misfired, changed the PCV valve as well. Next was the coils. I just changed the coil for cylinder 3 and 4. Kept on misfiring and CEL came on again. Had it checked and got P0300 (random cylinder misfire). Ended up replacing the other coil as well and still misfires. Cleaned out the EGR valve and the MAF sensor and still misfires even after new plugs and coils. No CEL is coming up as of now. Also, I have a SRI and there are no cracks on the piping so air is not leaking out. I also put seafoam in the gas tank and oil hoping that something was clogged but that didn't work. Anything other suggestions on what to do next? This problem is very annoying.