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Lope at Start up? VP44?

Huskiemuskie
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JAG1

JAG1

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Two trucks that lope at Idle........Have you guys checked for tank vacuum when removing the fuel caps? After a run remove the cap to hear for any the hiss or air running into the tank.

 

How about the screens in the tank and the other small canister shaped plastic screen filter in the module? Have you cut those things out yet. Sounds like a fuel delivery problem like fuel pressure bounce  sort of like water hammer in piping if that applies.

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JAG1

JAG1

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Mine started doing that on a long trip heavy haul so I let it idle in neutral for about 10 seconds before putting it in gear. If I could let it roll first that seemed to help stop the stalling also. Problem went away on it's own eventually. I understand that neutral gets the trans fluid pumping throughout the trans better when not underway.

Edited by JAG1
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