Engine/Transmission (1998.5 - 2002) low rpm sputter or hesitation!

[GreggNoble]

hi, my 2001 auto 5. 9 has a low rpm sputter or hesitation,this is right when i try to move,the engine will hesitate and fail to rev temporily, i have tried all obvious things like fuel filter etc. it goes away after around 1500 rpms and its worst when she`s cold ,any thoughts? thanks

 

[dlamkey]

I had the same problem with my 2001 with 5 speed. It got progressively worse and

soon was hard starting. Last week we replaced the vp-44 pump and the problem was

solved

 

[Chief USA]

hi, my 2001 auto 5. 9 has a low rpm sputter or hesitation,this is right when i try to move,the engine will hesitate and fail to rev temporily, i have tried all obvious things like fuel filter etc. it goes away after around 1500 rpms and its worst when she`s cold ,any thoughts? thanks

Any codes being captured by the PCM/ECM? A bad or out of calibration APPS could cause this as well as a bad VP-44. Check to see if your system has any codes latched.

 

[GreggNoble]

thanks guys, it almost seems like a timing issue ,is that possible? cause as soon as she get to 1500 rpms it pulls like normal!

 

[Chief USA]

thanks guys, it almost seems like a timing issue ,is that possible? cause as soon as she get to 1500 rpms it pulls like normal!

Do you know how to check for codes?



I doubt it is a timing issue.

 

[Bob4x4]

Timing is handled by the vp-44

 

[GreggNoble]

Thanks, if it is my vp44, how big of a job is it to put the p pump on it? i have several 5. 9 cummins industrial engines with the inline pumps on them,would the conversion be difficult? i guess the computer would be a problem huh?