s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

98 s10 zr2
4.3
the truck will run okay for about minutes and than starts to bog very bad and wants to die.

replaced

egr valve
ignition module
plug wires
plugs
cap n rotor
mass air flow sensor.
o2 sensor that caused original code


checked resistance on injectors
checked fuel pressure
new fuel pump and filter was put in 6 months ago.

still no luck. will not even throw a check engine light or any codes.
will paypal some cash to whoever leads me to the answer.

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

Did you check fuel filter or just assume? Bad batch of gas maybe?

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

Light the POS on fire S-10s are junk

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

clogged converter
to check disconnect and let it run

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

Leaking coil. Replace coil.

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

i know one i just rebuilt the motor on ran like ---- when i got it back together, boged and just ran like ----, replaced the fuel filter and still ran like ----, ended up being the crank angle sencor, i work at a shop and i see crank and cam sencors go out all the time and make cars run like ----. test that. also is it vortec or ? and how much fuel pressure at idle.. also is it throwing any codes? even if the light isnt on it could have a code in the system, or a past code that has been cleared and not fixed, seen it a million times :o

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

already unplugged the cat. no luck. wouldnt it throw a code if the crank positioning sensor went out? fuel pressure is about 60 psi at idle. i have a code reader and it does not show any codes in the system. any way to be sure there are no stored faults?? im lost.

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

replace ur fuel pump again i just had that same problem a week ago and fuel pressure was good but i replaced the pump again and its been working just fine

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

Check fuel pressure when it dies and see if it drops off, if not, I would replace the crank sensor. Crank sensor doesn't always throw a code.

Re: s10 4.3 gurus chime in. cannot figure out this one. get 5 bucks.
 

those engines are very very sensitive to fuel pressure, I think spec is 60 if I remember right and the fuckers will barley run on 50. Only engine I have eveer found like that.