53wanab: I am not at all surprised to read that this happened. You are fortunate that you did not do damage to your engine.
Microtuners, ALL of them, only work correctly when applied to powertrains whose PHYSICAL characteristics are known and precisley mapped for within the microtuner.
The Crane has more flexibility than any of the others I have encountered so far, in that its programming apprently includes parameters to use with certain PRE-IDENTIFIED aftermarket parts.
Once you replace a "known" part with a new part "unknown" to the microtuner part, or ADD a new part unknown to the microtuner, the preprogramming instantly becomes WRONG (unless the change made is so small as to not require re-programming, in which case it is not worth doing, right?).
This is an inherent limitation of the microtuner approach. If you want to use components not prepoprgrammed into the microtuner, you need to do one of 2 things:
1. Change the A/F ratio and/or spark advance characteristics by trial and error using the limited change capabilities of the microtuner (not recommended since you are working blind and could grenade the engine), or
2. Put the vehicle on a dyno, attach an exhaust gas analyzer that is accurate across a wide range of A/F ratios, and manually make incremental adjustments on the microtuner to the A/F and/or spark advance. If you are going to this trouble and expense, it of course makes much more sense to just use a proper full-featured tuning product (like LS Edit, HP Tuner, or EFILive) so you can do it RIGHT.
Microtuners are for folks who do NOT intend to make other changes that affect engine output. If your plans are grander than that, the microtuner approach is the wrong one.
By the way, the "hesitation" COULD have been your GM engine protection features saving your engine for you.
Jim G
Microtuners, ALL of them, only work correctly when applied to powertrains whose PHYSICAL characteristics are known and precisley mapped for within the microtuner.
The Crane has more flexibility than any of the others I have encountered so far, in that its programming apprently includes parameters to use with certain PRE-IDENTIFIED aftermarket parts.
Once you replace a "known" part with a new part "unknown" to the microtuner part, or ADD a new part unknown to the microtuner, the preprogramming instantly becomes WRONG (unless the change made is so small as to not require re-programming, in which case it is not worth doing, right?).
This is an inherent limitation of the microtuner approach. If you want to use components not prepoprgrammed into the microtuner, you need to do one of 2 things:
1. Change the A/F ratio and/or spark advance characteristics by trial and error using the limited change capabilities of the microtuner (not recommended since you are working blind and could grenade the engine), or
2. Put the vehicle on a dyno, attach an exhaust gas analyzer that is accurate across a wide range of A/F ratios, and manually make incremental adjustments on the microtuner to the A/F and/or spark advance. If you are going to this trouble and expense, it of course makes much more sense to just use a proper full-featured tuning product (like LS Edit, HP Tuner, or EFILive) so you can do it RIGHT.
Microtuners are for folks who do NOT intend to make other changes that affect engine output. If your plans are grander than that, the microtuner approach is the wrong one.
By the way, the "hesitation" COULD have been your GM engine protection features saving your engine for you.
Jim G
