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The Humvee takes off on its own like if someone flipped the "After Burner" switch.

Tiwaz

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Miami Beach
The problem is that going at a steady speed, say…. 30 mph without changing the pressure applied on the gas pedal, all of a sudden the truck (1151) behaves like if I floored the pedal, it even downshifts on it’s own and takes off, and if I keep the same pressure on the pedal, it reaches about 50 MPH (or more) and it stays there for 10-15 seconds and then it behaves like I removed the foot from the pedal all together and it goes back to normal.
It does this even at 50 MPH the only difference is that it does not downshifts but you still hear the engine revving up and the speed increases substantially.
 

Mogman

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Papalote, TX
What gets me is the TPS controls the downshift, along with the programming in the TCM.
So how is the TPS creating WOT without the shaft moving and at the same time the internal gov/linkage fails do do its job creating the same WOT condition as the TPS :eek:
Or is the shaft actually moving.....
 

Mogman

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Staff member
Moderator
Steel Soldiers Supporter
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Location
Papalote, TX
I would inspect the linkage and cable and the accelerator pedal carefully.
Does there seem to be ANY other influence that could be a "precursor" to the event????
 

NDT

Well-known member
Steel Soldiers Supporter
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Location
Camp Wood/LC, TX
What gets me is the TPS controls the downshift, along with the programming in the TCM.
So how is the TPS creating WOT without the shaft moving and at the same time the internal gov/linkage fails do do its job creating the same WOT condition as the TPS :eek:
Or is the shaft actually moving.....
See this scenario is why I was halfway serious about my "animal" remark, the electronic trans won't downshift if the injection pump went to WOT on it's own internally.
 
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