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04 AI intermittent electronic glitch


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Been chasing a INTERMITTENT throttle glitch on an 04 granite since i got it in 15. Sometimes when you take off its like your only pushing the pedal 1/4 or 1/3 the way when its actually 3/4 or more. I would say it does this 30-40% of the time you take off. When it does it, a quick full throttle, no throttle, then back to the amount of throttle that you really want usually solves it. It also will sometimes do it while at speed, de-throttle for some reason and call for the power you were at, and its not there till you cycle the pedal. And no, its not the “AI motor” lag, this one has the BMT manifold/turbo/5”Exhaust/injectors anti-lag recipe already done with good results, this is I believe an electronic issue. The electronic pedal has been changed, and the wires behind the pass side kick panel have been inspected for chafing. My driver noticed today that when it is acting up, the Allison trans stacks its shifts close, like it would do if you were actually only calling for say 30% power, but cycle the petal to get power and the shifts are then occur like they normally would while accelerating. Can anyone think of something that im missing that needs to be checked? Could the Allison possibly be derating the motor for some reason? (I dont think it is, my dda shop maintains it and said it is healthy with no codes, but im open for ideas) she is a good truck, but man this is aggravating 

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  • 3 months later...
23 hours ago, Bigjohn4300 said:

Well looks like we figured it out, engine harness! Changed the main on engine harness, not only cured the intermittent lag/low power, but also what everyone thought was a weak cylinder when cold, missed erratically until warmed up(we were prepping for a inframe OR a Etech swap, harness cured it. Im liking her a lot more!

Curious, how much did the harness set you back? We just bought a 2003 AI350. Harness seems ok... For now....

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  • 2 weeks later...
On 1/28/2022 at 9:29 PM, JoeH said:

Curious, how much did the harness set you back? We just bought a 2003 AI350. Harness seems ok... For now....

I'd love to know as well,  I've had the same issue since we bought this truck. 

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I'm curious too.. I just put a harness on an MP-8, and it was over 1500.00..  I did 1 Etech and 2 ASET's last year and I think they were around $1300.00...  jojo

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  • 1 month later...

one of my current customers sent me and older E-Tech wire harness for me to inspect for re-use, because he said a new at Mack was $1400.00..  He is a smart man with a lot of knowledge, so I assume he is right..   Jojo

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It may well have been around there, i just remember my mechanic saying he had changed one previously that was like $3500 ish, so i was mentally preparing for that, and it was well less than half, so i was happy!

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heck I only charged my customer $600.00 in labor to do the MP-8 wire harness..  maybe i'm a dumbass...  it took me 10 hours to do it..  jojo

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  • 4 weeks later...
  • 1 month later...

Btw, the mechanic corrected me on the truck he had said was 3500, that was on a Mack tanker that rats got a hold of, that was under hood, in cab, and the pump panel, all new harnesses 

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