Thread: Cylinder 3 Misfire No Luck Please Help

I have cylinder 3 misfire but only under heavy load. I have brand new plugs (104's gapped to 55) and new Accel 8mm wires. I get the flashing light if I stay under throttle. If I am just driving around no problems or codes. Any ideas? An injector is $75 or new coils are about $45 a piece.

Free tests:
Swap the plug wires at the coil for #3 and #6, does the misfire move to #6?

Put one of your old wires back on #3. I haven't heard that Accell are either great or horrible wires, but a wire can break down or be bad. Need to rule it out.

Pull the plug, any carbon traces or possibility that when you tightened it, it may have cracked? Sometimes working around the dogbones will put us at odd angles and that can crack plugs, might not be evident at first.

I'll try that tonight thanks! Is it possible one side of the coil is bad?

Yes it is. Our coils fire both towers at once. Which is how you can swap the wires to see if the misfire changes cylinders. However I have found one tower to be broken, burned out etc in the past.

Originally Posted by Phyrstorm

I just had this problem and it was the coil. Coils for a 98 GTP at autozone were only like $26.

Duralast/Coil - Ignition | Coil - Ignition | AutoZone.com

Thanks guys it was the coil

gotta love the easy fix