S14 SR20DET Weird Misfire/Idle after Warm only when revved past 3k

[NukeKS14]

Or wiring. Check your coil pack harness. Pull it and inspect everything. Could be some insulation rubbed off/nicked and is shorting out.

[grizzly8181]

Originally Posted by NukeKS14

Or wiring. Check your coil pack harness. Pull it and inspect everything. Could be some insulation rubbed off/nicked and is shorting out.

If it were more wiring related though wouldn?t it be doing it all the time instead of only after the car runs for a while? On cold starts I can rev it to anything and it never does this but drive around for 5-10 minutes and any high rev will cause it to only fire on cylinder 4. I’m going to check the signal from the ecu and igniter to make sure that is still going through.

[NukeKS14]

Originally Posted by grizzly8181

If it were more wiring related though wouldn?t it be doing it all the time instead of only after the car runs for a while?.

Not necessarily. If its nicked or making incidental contact when it gets jostled from the engine moving it wont be all of the time. Just something easy to check and rule out. I had a similar issue from my coil pack harness grounding out intermittently from a small nick on the timing loop.

[grizzly8181]

Originally Posted by NukeKS14

Not necessarily. If its nicked or making incidental contact when it gets jostled from the engine moving it wont be all of the time. Just something easy to check and rule out. I had a similar issue from my coil pack harness grounding out intermittently from a small nick on the timing loop.

Solved the issue! Ignitor was bad, got it replaced and it?s all good now