Engine/Transmission (1998.5 - 2002) Slight poping or backfire at 2700+ RPM's?

[JaMan]

Last Saturday at a TDR meeting I left out pretty hard and some people said they heard a backfire or poping noise out the exhaust right before I shifted from 3rd or 4th to the next gear at pretty high rpm's (2700+), fuel pressure is good and never have had any codes for the pump, so what else could it be? Could they have heard a turbo flutter or a bark thru the exhaust? I can't here any thing and the truck doesn't stumble as far as I can tell. Any suggestions?



Jared

 

[JaMan]

Anyone have any Ideas?

 

[smithy]

hello, sounds to me like timing,any codes, like po216,

 

[Wyatt 1]

JaMan, rev limiter at 2700 rpm, happened to me. Anyone care to chime in,

 

[Wyatt 1]

It defuels at 2700 rpm thats what I have been told,

 

[PC12Driver]

The defueling at 2700 rpm is the ECM basically rolling off the throttle. It's not like a gasser that interrupts spark going to the cylinders to control rpm. So you shouldn't have popping because you hit the governor.

 

[Graphic man]

Comp box and timing could cause it,

sounds like it may be pooping back through the exhaust valve

you have the drag Comp and it will not de-fuel on 5x5 so it could be running out of rpm with a little too much fuel

i would call Edge and see what they have to say



Scott

 

[NIsaacs]

Cold engine maybe? The Cummins does not like high rpm until it is at rated temp.





"NICK"

 

[Todd T]

if your exhaust is wide open then you absolutely can hear it defueling. you should here it with twins, a ton of fuel and through a stack with the vent window open. Mine will do this on level 9 of the TST box when i come off it hard to shift or just to even out my speed with a lot of boost and fueling heavy still.

 

[JaMan]

no codes at all checked with the key and a separate reader.