misfire under load

[lozanoa11]

In my 3.8 i got a misfire in cyl #5 but only under load like 1/2 to wot. Im waiting for the engine to cool to check the plug but they are relitivly new. Any ideas????

[97rs4life]

coil pack.

switch the coil pack for cyl 5 with another one and see if the misfire moves to another cylinder

[lozanoa11]

Ill try it i may have to call off from work i have to be in at 4

[CHMLEON]

Did you have any rich or lean codes also or just misfire on Cyl. #5?

[97rs4life]

also if you do change the plugs go with NGK TR6 if you still plan on nitrous.

[lozanoa11]

Just misfire i can smell it when it misfires but no code. Im gunna try working on it now.

[SlipStreamZ28]

Dont forget to check the wire as well.

[lozanoa11]

Ok so my testing proved inconclusive. i switched the #5 and #2 wires on the coil it still misfired but it only set a random misfire dtc. Im gunna try to set it again and go to auto zone insted of advance later. But i have to go to work soon so ill have to do it later or next week. I can drive in normal trafic w/o it misfireing so i should be good. The problem with testing every thing is there is spark at idle and when reving up. There has to be load. I wish i had a dyno lol.

[96mikez28]

sounds like a bad opti, lol

[lozanoa11]

Yay I chanced it and changed the coil pack and it worked. Any time i just make an educated gusse its usaly wrong if its on my car lol.