Need advice (trucks stalling)

[doomdead]

instead of typing it all out again ill just paste what i said over IM to someone:


DoomDead2: truck started acting up again, it died while driving down the freeway, it started itself back up again. then a min later it died totally... i coasted to a stop (since i can't start it in N) put it in park, reset the computer, went to start it, no go... hooked my FPG back up, got plenty of pressure. pulled out the ult chip, truck started right up...
DoomDead2: took it back hom to get the blazer
DoomDead2: on the way home
DoomDead2: it died two more times
DoomDead2: but it was easy to restart
DoomDead2: so its not hte chip
DoomDead2: not fp
DoomDead2: not coil
DoomDead2: only thing i can think of... but i really doubt this, is when i was plugging the fpg back in, i removed the shrader vavle and i could have sworn i thought it blew out a little air while it was letting off pressure. So ya air in the fuel line would do it... but where did the air come from...
DoomDead2: at least all of these times this happened i wasn't under boost
DoomDead2: so im not worried about hurting the truck too much
DoomDead2: but whats odd
DoomDead2: is if iwas really having air in my fuel line
DoomDead2: why would the truck run so good prior
DoomDead2: at any rate i also noticed that my fpg wasn't jerking all over the place



now. what i meant about the fpg jerking around, was that after a few months running this new guage, it started clicking really bad and jerking all over the place... we figured i needed an isolator, but if there was a bubble up there i guess that would do it...

so i guess my question is this.
if the truck dying is due to no fuel, how do i get the air bubble out AND be able to get the FPG plugged back in...

im so confused as to why this happens when im not running it hard, yet ive ran it hard a few times this week and never had a problem.

 

[doomdead]

update....

there was also a noise i could hear under the top manafold... like a clock ticking... im still hearing this, thinking it might be somewhat related...

with datamaster hooked up and running, and the truck ign on, but the truck not started.... data master looses connection everytime that click happens under the top manafold... it sounds like its coming directly center in the top.....

 

[Guest]

Do you still have the stock pump? The exact same thing happend to me when my fuel pump whent out on me... I would start up but when I was driving it would die. Start it up and drive again and it would die. but then it would drive fine for a day and then boom there it goes again. I'll bet that is your problem. I am almost sure actually. Thats probably why you herd air coming out of the schrader valve. The demand on the pump is getting to much for its age and quits usaully after driving for a while when its good and warmed up... HTH.. Later Dan

 

[doomdead]

Good advice although no, i have a new walbro 255, less than a year on it..


UPDATE: Trucks dieing when it gets warmed up, on either stock chip or ult chip.... Also am leaking fluid, quite a bit. dripping from the back of the lower rad hose.... trying to figure out if my ring is tight enough / in the right place, or its the bottom of my water pump... but RIGHT when the truck wants to quit, the water starts dripping, if i let it chill a bit it starts right up....


Weird thing, is im still topped off fluid wise....

 

[doomdead]

Solved it... waterpumps dead... i can see rust coming out of that little hole....


two questions, if the truck was killing itself, what was going on?? too much heat causing damage? or a sensor shutting the truck off?


Not the same sensor on the dash right? that never got hot... im wondering where the ECM temp sensor is located vs the dash sensor.

How much for a new water pump? (standard 4.3?)

 

[ed hess]

ecm temp sensor is on top of lower intake next to rad hose. gauge temp sensor is between cyl no 3 and 5 on drivers side cylinder head.

ed