Quote:
Originally Posted by j cAT
since the exhaust is wide open no restrictions , I would say the cam lobes are worn and the compression is low. no sucking no power.
engines are like pumps. when they lose compression they no longer can suck air and fuel to create power.
you most likely will find low vacuum as well.
305 is a gutless engine . when used in a truck at this mileage I am suprised it still can climb a hill.
1992 truck is a heavy vehicle.
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I have considered that because it is old and has high mileage and the "chug" I get after accerlerating and then letting off resembles a hot rod engine with a low cam at idle(like when it lopes) So trust me i have thought of cam issues and the fact that the engine it just plain worn out but what leads me away from thinking that are these things; the engine burns less than 1/4 quart of oil between changes, it ocasionally runs like a raped ape and has all sorts of power and acceleration(very rarely but sometimes it happens just out of the blue) as well as after i put my stock air intake back on after modifying it and making it free of restrictions (so its a free flowing true cold air intake) it does seem to run better and downshift less frequent at higher speeds.
Those things lead me to believe that the issue lies somewhere other than a "worn out engine" I have also considered the fact that the problem could lie in the drivetrain. It does have a rebuilt transmission and a new torque converter but the transfer case is not in the best shape(it takes a little while for 4 wheel drive to actually engage and sometimes you can hear a clanking sound when shifting from park to OD, it was also driven without oil in the transfer case for a couple hundred mile by the previous owner I am kinda just limping it along till i absolutely have to get a new one) as well as the rear diff isnt new either so that has crossed my mind It could be any of those things, and even thought the torque converter is new sometimes i do think thats my problem it acts like the torque converter is the wrong rmp stall for the engine.
Is it possible that it could be drivetrain related or is that a crazy thought?....I realize i need to do the test stated in the previous posts but i wont have time to do so till this weekend so any more info i can get to help me and help pinpoint is greatly appreciated.