I was driving my truck on the highway the other night and after about 30 mins on the road, it began to bogg down at about 70 MPH. If I gave it more gas, it got worse. As I let off, it would be alright, but progressivley get worse to where the truck stalled. After about a half hour of rest, it was good to go....but only for another 20 mins and the same episode happened all over again. Needless to say, an hour and a half ride turned into almost 3 hours.

I know its tough to diagnose over the internet but if this sounds familiar to anyone, what did you do? From talking to others, it seems like a pump/filter problem. I had a compression test done and it was great. The mechanic could not duplicate the issue and it ran fine for him...

Any input would be appreciated.

Thanks,

Sully

 

check your fuel pressure

 

i used to have a 94 ranger.. cut springs sat like 3 inches off the ground with a 5.0 mustang motor in it, anyway long story short.. the truck would run.. then shut off or stall or bog down.. if it stalled and i let it sit for about 15 mins it would fire back up.. turned out to be a vaccum issue.. id say double check fuel pressure, make sure your fuel filter is not clogged.. double check that your fuel pump is stable.. what i mean by that is make sure it work all the time.. not just some of the time (hence why the mechanic wasnt able to duplicate it) and also check your vaccum.

 

Catalytic Converter. Have it checked.

 

thanks z.. i knew i was forgetting something else too.

 

Most of the time, when we see a truck bog down and get worse with higher loading, it turns out to be a collapsed catalyst. It's like jamming a potato in the exhaust. You know the drill. Smack it (listen for a can fill of rocks), check temperature at input/output, pull front O2 sensor to see if it clears.

 

Thanks for your input guys...I'm leaving it for a week, but next weekend i'll be workin on it.