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I recently sold that Suburban without ever solving the problem.
Have a different one now 2001, 6.0.

Sorry guys. My misfire problem is a mechanical problem and until I solve that not much sense in trying to tune it out.
Once it's fixed the tune will be a lot different I'm sure.

Cmr or is it Cmp?
My Ckp is at - 0.3 and does not very much.
Rotor is not hitting the cap. 0 side to side play. There is a little movement if I pull the rotor up. I can't say how much up movement...

I dont have a wide band yet.

I don't believe its injectors. 2 different set's nothing changed and they are all within 2 percent when performing a injector balance test using a snap on scanner....

No not a single DTC for misfires but misfires are registered on the scanner and felt.

Never thought to check the timing with a light but i can do that for sure. CMP is set to 0.8, Spec is ? 2.0...

I managed to get the plugs and coil changed today.
I gaped the plugs at .045 No change really.
Im at a loss on where to proceed myself. Every ignition part has been replaced with new less than...

Already ordered so no choice really + i was already thinking of trying old style plugs gapped at about .045.
I have suspected ignition as the problem for a while so i have replaced every part of...

Yes the tune is off road only and the EGR is blocked off when off road. Thanks!

Interestingly enough i do have Taylor 8mm wires. They replaced crappy new AcDelco plug wires.
The distributor was...

I looked for the STIT and as soon as the truck connects it disappears. Im guessing unsupported.
I think between your tuning skills and my trying to get #7 firing properly progress is being made. ...

I totally forgot to look for STIT but im willing to bet my ecu does not have it.
Plugs are NGK TR55IX i think. Rock Auto. Been thinking of just trying some plane ACDelco 12's
Hot idle is for sure...

Here are pics of the plugs when i re gaped them. I already had #7 re installed when i thought about pics but it looked the same as the other 3.

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Well actually i did not look for them yet.
I figured you were on vacation and i did not want to bother you by posting stuff you could not do anything about anyway. Better for you to enjoy a...

Vacation always good. ENJOY IT!

I loaded the last tune this morning and i really can't tell if better or not.
I was watching the scanner misfire count and #7 has a consistent misfire at idle.


I pulled that plug and re gaped...

Well yeah this is for off road only:rolleyes:
DUDE! that made a big difference in it. It is smoother for sure and i would say the best so far but right at idle i can still feel a misfire.
Watching...

My mistake!.
I was playing around trying to learn some simple things and i never intended to load that tune i changed the EGR on. Im not sure how i got it mixed up and loaded it.
Anyway, I don't...

Hard to describe. I can say for sure it is running way way better than it did when we first started.
Above about 12/15 hundred rpm it feels smooth as glass and can accelerate great! Below that it...

Mostly under 1K but it is slightly felt up to maybe 1.5k (ish)

I dunno man. Sometimes it feels great other times rough. Seems like when it first starts it feels great but as soon as the o2 sensor trims start is when it gets rougher.
The warmer it gets the...

Thanks man! I'll get this loaded and post a log and how its doing tomorrow after work.

The last tune made a nice difference. It is certainly feeling like it smoothed out and seems to be heading in the right direction still a little rough but better for sure.
Also, i think after doing...

I'll give it a try. It feels pretty good everyplace else except the idle up to about 1K RPM.
I will not be able to post a log till tomorrow after work.

Sorry, the wife been wanting to ride about so been hard to get ya a log.
Truck does not like the higher idle rpm. Feels worse almost like a dead cylinder but i dont think that is what it is.
Here...

Thanks for all the effort you have put in man it IS much appreciated:worship:
Idle still a little rough but could it be the LTFT needs to learn as im always resetting it and a new tune every time?...

Truck seems to be running pretty good with this tune Still slighty rough at idle. WOT pulls are solid and sits ya back in the seat. Decent for what it is. Definite improvement so far.

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