Mark this thread as Unsold
Cylinder Misfire
Aug 3, 2009, 07:46 PM
#1
Cylinder Misfire
Today I was driving and all of a sudden threw a check engine light when I boosted. I took the car to Murray's and threw the P0304 cylinder number four misfire code. I exchanged cylinder number four spark plug without deleting the code but still no luck. The car idles perfectly fine when I start it up but once I rev it (sitting still) past 5k, the idle becomes terrible as if it is about to die. Also, when I am driving and decide to boost the car works flawlessly but say I downshift and boost, the car starts sputtering. I don't know if this can be a problem but I installed a Walbro fuel pump last month without a tune and the car would hesitate sometimes. Feedback would be greatly appreciated! 
Aug 3, 2009, 08:34 PM
#3
Newbie
iTrader: (12)
Join Date: Aug 2008
Location: OH
Posts: 68
Likes: 0
Received 0 Likes
on
0 Posts
possible hole in the coil boot. i had same issue and that is what i had. there will be a small tear in the boot itself. the spark should be coming out of the boot so a white residue should be vissible. check into it for real evos are known for this.
