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.

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

buk stay the ---- out this thread you worthless lowrent basement gnome

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

KEEP THROWING MORE PARTS AT IT BASED ON WHAT SOME IDIOTS ARE SAYNG ON THE INTERNET!!!!!!

-----, it looks like honda tech in here

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

+1
look up the spec, throw that gage on there, and make sure the pressure doesnt drop below spec.

My truck was giving us sporadic problems with rough idle and loss of power and it was driving us mad trying to troubleshoot it. pressure was great on startup so we assumed it was good, but then it dropped off a couple pounds. It was just enough to make it struggle a little. My opinion: it was caused from replacing the pump with an advanced auto junker. 'lifetime guarentee' meant jack ---- after dropping the tank a few times and having it last only a few months gets old. Threw in a gm one and havn't had a problem since.

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

could be fuel pressure stick the gauge on the schrader valve and tape it to the windshield so you can keep an eye on it. If it dies with out fuel pressure changing then its not a fuel pressure issue. does the spark look good??

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

my friends dad has the same truck it has gone through 2 fuel pumps in the last 6 months so im thinking fuel pump again

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

did you just call me a idiot?

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

Nope, the fuel pressure comments are the right place to start, those fuckers are damn touchy....I was referring to the "put this in, put this in, my sister's cousin's grandpa had this fail in is truck once so put this in" comments.

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

It was a joke ;)

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

well then looks like i'm the idiot.

internet sarcasm > me

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

I should have used one of these ---------> :P