Bigjohn4300 Posted October 8, 2021 Share Posted October 8, 2021 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 Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted October 8, 2021 Share Posted October 8, 2021 In Mack Software, there is a function to do a throttle pedal calibration/re-set.. I think the code it throw's is 6-5... Do you have access to the software? Jojo 2 Quote Link to comment Share on other sites More sharing options...
Bigjohn4300 Posted October 12, 2021 Author Share Posted October 12, 2021 Joey, no i dont think i do, would my mack dealer have that? You think that may be a cure? Quote Link to comment Share on other sites More sharing options...
Popular Post Bigjohn4300 Posted January 28, 2022 Author Popular Post Share Posted January 28, 2022 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! 2 1 Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 28, 2022 Share Posted January 28, 2022 Hell, Mack should add the wiring harness to the filter tune up kit! "Change your wiring harness with every oil change!" Make your truck run like new again! 1 Quote Link to comment Share on other sites More sharing options...
JoeH Posted January 29, 2022 Share Posted January 29, 2022 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.... Quote Link to comment Share on other sites More sharing options...
OldRedMack Posted February 12, 2022 Share Posted February 12, 2022 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. Quote Link to comment Share on other sites More sharing options...
JoeH Posted February 13, 2022 Share Posted February 13, 2022 Easy enough to call the dealer and ask, my bet is in the $2500+ range. But... The years you'll get out of it... Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted February 13, 2022 Share Posted February 13, 2022 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 Quote Link to comment Share on other sites More sharing options...
JoeH Posted February 18, 2022 Share Posted February 18, 2022 That's not bad; worth saving up a little cash and getting some new harnesses, the old ones look like sh*t. Quote Link to comment Share on other sites More sharing options...
Bigjohn4300 Posted April 13, 2022 Author Share Posted April 13, 2022 Sorry, been busy, ill go back and see, but i think it was around the low 1k area, but ill check Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted April 13, 2022 Share Posted April 13, 2022 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 Quote Link to comment Share on other sites More sharing options...
Bigjohn4300 Posted April 14, 2022 Author Share Posted April 14, 2022 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! Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted April 14, 2022 Share Posted April 14, 2022 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 Quote Link to comment Share on other sites More sharing options...
Bigjohn4300 Posted April 14, 2022 Author Share Posted April 14, 2022 No im pretty sure he was talking cost of harness, i think they had 5 hrs in harness changeout and some other miscellaneous items that time Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted April 14, 2022 Share Posted April 14, 2022 oh my... Quote Link to comment Share on other sites More sharing options...
Bigjohn4300 Posted April 14, 2022 Author Share Posted April 14, 2022 Thats bad? Quote Link to comment Share on other sites More sharing options...
Joey Mack Posted April 14, 2022 Share Posted April 14, 2022 im saying, i could have made a bunch more money, bad for me... jojo Quote Link to comment Share on other sites More sharing options...
OldRedMack Posted May 12, 2022 Share Posted May 12, 2022 Just ordered the engine harness from nextran in Atlanta. $933.00 1 Quote Link to comment Share on other sites More sharing options...
Bigjohn4300 Posted June 28, 2022 Author Share Posted June 28, 2022 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 Quote Link to comment Share on other sites More sharing options...
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