I keep getting P0300 codes for random cylinder misfire. I have also gotten cylinder 2, 4 & 7 misfire codes. The misfire can be observed while sitting in park and accelerating slightly above idle or it can be observed while accelerating hard under load such as climbing a hill.
What I have done so far is the following:
Replaced all plugs and coil packs.
Replaced fuel filter.
Replaced fuel pump driver module.
Checked vacuum (holds steady at 18" of Hg). Looked/tested for leaks and found none.
Verified there is plenty of air entering the throttle body.
Cleaned the mass air flow sensor.
Inspected for any loose wiring to coil packs and injectors and none found.
Inspected vacuum while accelerating to approx. 2000 rpm and vacuum held and increased slightly so I don't believe there is exhaust blocked. I also don't see any glowing catalytic converts.
Perplexed as to what could be the problem or what to do next.
have the same problem?
Thursday, April 14th, 2016 AT 8:11 AM