My brother just bought this truck with 217K in good shape.
It has a hypertech chip/programer and came with a not-yet installed propane kit w/tank and remote fill.
Problems; truck takes 3-4 seconds to start hot or cold. Batteris and starter seem to be in excellent condition.... engine spins quickly durning cranking.
Under 2500rpms at idle or load engine feels like there is a slight miss. After 2500 the engine feels perfectly smooth and has great power. It does not feel like a dead cylinder as the miss is not that strong. seems to hesitate around 1250rpms on acceleration.
Stuff I've checked; air cleaner is a dreaded k&n. I pulled the intake tubes which were fairly clean as well as the turbo fins. fins actually looked perfect.
removed oil cap to check amount of blow-by... just steady light vapor. place hand over hole with no feeling of surging or pressure.
drained very slight amount of water from seperator. I have not replaced fuel filter but will be doing so today or tom.
The truck MIGHT smoke just a bit on cold startup but once warm doesn't smoke at all. There is very slight smoke on hard acceleration (hypertech set on stage 2).
The truck was purchased from a second owner who purchased it 2k ago from uncle. (2nd owner is rich and sold this truck because he bought a 4500.) afaik the ONLY major maint. was recharging ac system and replacing a couple injectors.
CEL works but is not on.
anyone have suggestions as to what might cause this "miss"?
I'm going to take the pressure reg out of the back of the hpop this afternoon if I can find an oring kit to service that.... maybe there is some debris in the small needle valve and its allowing oil to flow out and not build pressure until the engine cranks long enough to build pressure?
can the HPOP be weak and not build enough pressure at low rpms which might cause the engine to "miss"?
any help would be fantastic!!!! have a good day,
Adam
It has a hypertech chip/programer and came with a not-yet installed propane kit w/tank and remote fill.
Problems; truck takes 3-4 seconds to start hot or cold. Batteris and starter seem to be in excellent condition.... engine spins quickly durning cranking.
Under 2500rpms at idle or load engine feels like there is a slight miss. After 2500 the engine feels perfectly smooth and has great power. It does not feel like a dead cylinder as the miss is not that strong. seems to hesitate around 1250rpms on acceleration.
Stuff I've checked; air cleaner is a dreaded k&n. I pulled the intake tubes which were fairly clean as well as the turbo fins. fins actually looked perfect.
removed oil cap to check amount of blow-by... just steady light vapor. place hand over hole with no feeling of surging or pressure.
drained very slight amount of water from seperator. I have not replaced fuel filter but will be doing so today or tom.
The truck MIGHT smoke just a bit on cold startup but once warm doesn't smoke at all. There is very slight smoke on hard acceleration (hypertech set on stage 2).
The truck was purchased from a second owner who purchased it 2k ago from uncle. (2nd owner is rich and sold this truck because he bought a 4500.) afaik the ONLY major maint. was recharging ac system and replacing a couple injectors.
CEL works but is not on.
anyone have suggestions as to what might cause this "miss"?
I'm going to take the pressure reg out of the back of the hpop this afternoon if I can find an oring kit to service that.... maybe there is some debris in the small needle valve and its allowing oil to flow out and not build pressure until the engine cranks long enough to build pressure?
can the HPOP be weak and not build enough pressure at low rpms which might cause the engine to "miss"?
any help would be fantastic!!!! have a good day,
Adam