4.3 running like crap....need help asap!!!!

Edited: 9/16/2009 7:18:47 AM by draggin95niss

Edited: 9/9/2009 9:44:35 PM by draggin95niss

first thing first..put a filter on it,it will fuck your pump up if you dont. it sounds like you running way too rich for some reason. could be ur fuel pressure regulator..on this motor is should be somewhere under the intake plenum. they can get to the point where they leak so bad that it thins out the oil,so i wouldnt plan any long trips with the truck until its fixed.

btw,nice truck. whats all wrong with it? besides the engine lol.

well the where th efilter use to be there is a piec of hose clamped on connecting the 2 hardline together, my question is what filter do i run since the oe style wont work now cuz one side is a bolt on and the other side slides on and uses a hose clamp....and im assuming i would need to pull the intake to get to the regulator????

Edited: 9/16/2009 7:16:19 AM by draggin95niss

---------------------------------------------Originally posted by SoloSpecialtiesbtw,nice truck. whats all wrong with it? besides the engine lol.---------------------------------------------

my 93 blazer with a 4.3 is doing the samething, i'm told its the spiderinjector gone bad, but that little creature isnt cheap and i dont have the time to do it myself so it just sux all around..anyone near charlotte and wanna help a fellow minitrucker out that knows how to do it...pm me!!

wow man,sucks about the truck. i liked that dually you hadd. to be honest,i cant remember if you have to take the intake off,i havent worked on a 4.3 in little bit...i think you do tho,which isnt hard as long as you have a little knowledge. on the fuel filter,you should be able to get a replacement line then possibly splice it back into the bypassed line. i have a complet 4.3 and fuel system..i may have to look at it tommorow to make sure.

Ok guys listen ....first off,check to see if the fuel pump is in the tank..I experianced the same kinda problem with my Safari when I bought it..Ran rich and ran real rough.I was told by the GM dealership that ran a diagnostic on it that it was infact the spider injection. Tear it down , replace the spider injection and intake plenum gasket , runs like shit still....Now,i replaced all the usual stuff after that..O2 sensor,plugs,wires, dist cap,rotor button,pickup in dist and still it ran like shit. I was then really sorry I bought it.I went to see a local machine shop guy about some work I already had thereand we got on the discusion about the Safari and the problem I was having....Turns out he was right on this one..seems 4.3's have a problem with their intake valves..for lack of better terms..mushrooming or cupping the face and not closing when running or under a load..basically they are staying open and you can't detect it doing a compression check because of no oil pressure the valve closes enough to not show a drop...I know this sounds like alot to go thru....but I just wanted to let you know what it could be....I hope this helps you guys out.....BIG RICK____ASTRO SS.   Also guys...don't drive them like this....It Will thin your oil and you know what that can lead to...mine came out like gas...flush it with new oil..then change weekly for at least 3 weeks to get it all out..

i know enough about the motor to know it doesnt havethe spider ting its an older tbi engine....i really dont wanna go pullin heads, also one other thing is the oil pressure gauge isnt work in at all and the check gauge light is on, i dunno if this could be of any relavence....

did you check the distributor cap and rotor?