Misfire I can't find

[Blk04Snake]

Got a problem I can't track down. I've got a slight misfire that you can notice a lot when light in the throttle like when you are driving thru town. I think it's doing it under load too because when I ran on Dyno a couple months ago it appeared to be doing it and running rich. When tuned last year it ran great and put down 446/452 and this latest run it didn't even break 400hp. I've swapped coils and put in new plugs no difference.

Any ideas on what I should check out to fix this?? Thanks


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[horspla2000]

what plugs, what gap, stock coils??

 

[TVSCobra]

any codes to what cylinder it maybe on? plug type? gap? etc?

 

[TRQJUNKIE]

Injector going bad? Does the idle seem a little off? If so you can pull a coil one at a time to try and find which cylinder is giving you the issue. The exhaust tone will change slightly if you pull a coil on a fully functioning cylinder. If it doesnt change then thats prolly the one giving you issues. That will narrow it down for you a little.

 

[Blk04Snake]

No codes, No check engine light. I haven't checked yet to see if it's detecting any amount of misfire or not.

NGK TR6 plugs gapped to 0.032", FRPP coils from Tousley that I replaced the entire set last year.

 

[horspla2000]

There are a few threads about the TR6 plugs giving a part throttle stumble. I had some and I had the stumble. I have TR7ix's now and its gone. (just FYI, may not be your issue, but sounds like it)

 

[Blk04Snake]

Misfire under load too? Something is making me lose about 60hp and some torque too likely related to the misfire


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[blwn03sonic]

I think I have a similar issue and still haven't found it. Car is currently on jack stands. Here is my thread. http://www.svtperformance.com/forums/engine-tuning-214/852005-gremlin-somewhere-my-cobra.html