I would still change it out so that it's correct!
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I would still change it out so that it's correct!
Get it on a dyno and hook up a timing light and see what happens... It has to be a spark issue, it just looks like a rev limiter. If it was fuel the wideband would reflect it.
Not necessarily... it can be fuel and the wideband read incorrectly...
Still.. i feel its a coil issue as when it "heats" up it starts to act weird. The tune has nothing "wrong" that would make this happen... If it misses it will read lean.
Wouldnt all the coils have to be bad in order to not let it rev? If one was bad it would just run bad but would still rev.
It does seem that the only thing left is to replace the computer.
Lee
Too big of a miss on a few cylinders and you will have a problem.. I had a similar problem, changed ECUs and was done with it.
This is the 3rd PCM I have tried. Thought the original 98 was bad and swapped it out. Then I converted to the 99-04 PCM with the new stand alone harness. Have changed the coil packs and then tried them on my truck and they ran fine. The injectors were new but I bought another new set and tried that. Second new set of MSD wires. Second set of new plugs. Second new fuel pump. Second new fuel regulator. 4 new crank sensors. 2 new cam sensors. 3 new TPS switches. Burned a 50 gallon drum of VP. Burned up a set of drag radials. I have spent thousands chasing this problem.
The reason I'm still using an auto trans base tune is because I'm still using the stock shifter and park/neutral switch.
I agree it only takes fuel and ignition, the right amount at the right time. I feel the amount is right but is occuring at the wrong time.
In the log today starting at frame 1237 I did a 5 sec blast. AFR looks normal and followed commanded along with everything else, but it was breaking up so bad it would not accellerate. It should have hit 7200 rpm. It just doesn't make any sense to me.
So, your telling me that cold you can go out there and do a 5000 to 7000 RPM blast and log it?
Is it possible that you have the injector wiring wrong and it's firing the injectors in the wrong sequence?
Maybe this could be resoned because the injector timing cold is fired at a different time.
Change B3702 and B3703 all to 2.55 and see if it will rev....