Bought a 1993 s10 blazer off a friend of mine recently with a no start issues it will only run if you play with the gas pedal and even the sometimes it won't this it my first 4.3 I've worked on and I'm stumped I've replace a lot of stuff though (list below) also I have the W code 4.3

Replaced
Fuel pump(twice)
Spider injectors
Icm
Maf
Cap
Rotor
Spark plugs
Iac
Tps
and the egr valve

any help would be greatly appreciated

 

Okay, lets stop throwing parts at it. With these trucks, when you are putting your foot on the gas, are you putting it to the floor? Or just pressing it lightly?

What brand fuel pump and injectors were used when you replaced them. These things are picky as f&*k, same goes for the plugs, rotor and cap. They LOVE OEM parts and really do not like aftermarket parts *airtex* for example. The more information we have the better we can help you.

 

:icon_lol: You could start by making sure your getting fire to all 6 plugs!

 

Most of of the parts that were replaced were done before I bought the truck I replaced the IAC and the throttle position sensor with napa brand parts and the previous owner put in a Delphi fuel pump with a life time warranty

 

Also usually will start with foot to the floor or if I feather the pedal and I can come off the pedal almost all the way then once I let off it dies immediately

 

Finally got around to working on it again today checked my fuel pressure

key on 56 psi

key off after 1 min 55-54

key off 5 min 50

key off 10 min 46


thats at out of spec I think?

 

Yes it is. If its a ne delphi pump, it could be the spider injectors under the plenum. you need to check the fuel pressure at the filter. if the pressure stays up, its most likely the spider. if it leaks down again, itd the pump

 

I'll definitely give it a try but the spider injectors have been replaced as well could it possibly be the fuel pressure regulator?

 

pull off the throttle body from the plenum. Look for shiny areas under the plenum. should be charcoal black. shiny spots mean gas has been washing it clean. If so you have a leak under there. if not ,pump is bad

 

Took the plenum off and checked everything looked a little clean on the drivers side put it all back together and same thing no start I did spray a little intake cleaner in before I tried to start it and it tried to fire up but seemed to die after that ran out so guess I'll start to look into fuel pump issues

side note I talked to my buddy the previous owner and he told me that he replaced the fuel pump 3 TIMES it would run for about an hour or so but then he would try and fire it up and again same no start no idle every time he did it