mikal711

hi all , my brother has a 1999 24 valve that going down the highway the engine stalls and drops to idle , after a few minutes idling it runs fine for a little while then does it again , could this be the lift pump?

marksmith

Sounds to me like a TPS... or whatever fancy (APPS??) thing the newfangled trucks use.


Lift pump doesn't usually effect fuel to that effect.

graphitecumnz

could either be the injection pump or the APPS... really need to have the codes scanned to find out.

singleturnout

mine did the same thing it turned out to be the ignition a wire was loose from moving the steering wheel up in down,tell him to start it up and giggle the key around when i did it the truck would idle and all the gauges would drop to zero
https://www.dieseltruckresource.com/...d.php?t=101256


check out my thread and see iff he has any of these problems

jturuk

I have the same truck 99, 24 valve. Very similar thing happened to my truck. Mine would suddenly go to idle while driving in town. Never did it on the highway though. took in to the dealership and they said it was a bad electical connection. It happened so long ago ( shortly after the truck was new) that I can't remember which connection it was.

John