Engine/Transmission (1994 - 1998) need some help, power problems

[pistol45]

a friend of mine has a 94 3/4 4x4 manual truck. at idle the truck lopes and shakes, going thru the gears there is no power at all. after cracking the lines to the cylinders open only 2 out of the 6 were responding according to him. He drives the truck daily and has had it at 3 shops and all 3 had different suggestions ranging from a new pump to just a governer. What is your alls opinion on this?

 

[Extreme1]

It could be:



1) Plugged (or bad) fuel filter.



2) Bad fuel.



3) Low fuel pressure from:



a) Bad lift pump.



b) Bad overflow valve.



4) Worn or damaged injector pump.



5) Deteriorated fuel line allowing air to get into the fuel going to the injector pump.



I'd start by checking the fuel pressure to the injector pump. If it's low, and assuming the filter is not the problem, inspect the hoses (the stock ones die after a few years).



Next suspect would be the bypass valve. Check it by crimping the return line and see if the pressure goes up. If you still have low pressure, the lift pump (or the filter screen on the bottom of the fuel heater) are the problem. (One member did have the screen in the fuel tank get plugged so there is something else to check).



If he eliminates all those possibilities and still has problems, I'd suspect the pump.



Tell your friend that if he was a faithful TDR member that he wouldn't have to bug you to find this out for him. AND, if he hung out here, he would probably already have a pretty good handle on it. Hey, he knew enough to try to diagnose it by cracking the lines...

 

[pistol45]

thanks extreme 1!



yes he should be on here and he probably would have a handle on it BUT I would hate to see him actually on a computer it would have more problems than his truck! thanks again