Need some help please

5SpdTy

Member
ok, heres what happens.

when the engine is cool it runs fine, but when it gets warm and is idling at around 800 it almost stalls out goes to 0 rpm then back up above 1000, tries to stall again and keeps repeating then eventually dies. if i keep the rpms up above idle it is ok no mater warm or cool. also i noticed when i was driving it, before i stoped and noticed the problem, it was getting more boost than normal. the only problem i know of right now is my ic pump is shot, a couple days now, but i dont think thats it, maybe though casue the upper ic gets crazy hot. i think its fuel related, can some one please help me out,


ps: i drove like 5 miles home when it stalled and would start again for like 20 mins or so. i drove it at 2500 rpm's the whole way home and it was ok. i wasnt leaving it in secaucus, nj over night on the side of rt 3, u'll know what i mean if ur from round here.
 
Last edited:

Don W.

Stab it and steer it
Re: Need Some Help Please

Re: Need Some Help Please

Bad or clogged IAC valve, EGR valve leaking, bad MAP or vacuum leak in line to MAP because of over-boost. Has it thrown any codes? Do you have a Datamaster file?
 

5SpdTy

Member
Re: Need Some Help Please

Re: Need Some Help Please

whats the iac valve? the egr is ok i have delete. and vacume is good. i turned up the fuel pressure a little last night and it fixed it. i think i cloged my fuel filter the other day casue i ran my tank dry:lol: , gas is freakin expensive;) . im gona change that this morning and let you all know what the out come is.
 

Don W.

Stab it and steer it
Re: Need Some Help Please

Re: Need Some Help Please

Idle Air Control valve. It determines idle speed, within limits, assuming no vacuum leaks etc. It's located on the TB (Throttle Body). Look underneath and toward the back of the TB.
If you clogged your fuel filter then change it. Adjusting fuel pressure to compensate is asking for trouble.
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5SpdTy

Member
Re: Need Some Help Please

Re: Need Some Help Please

i just changed the fuel filter and started it up and it ran good, for like a minute then died. gas is good and now i cant hear the fuel pump kick on, its a walbro. is there any way to check to make sure the pump is ok before droping the tank, fuses are good too
 

Don W.

Stab it and steer it
Re: Need Some Help Please

Re: Need Some Help Please

If you have a fuel pressure gauge then just monitor that. Fuel pump runs for 2 secs when you turn on the key so pressure should be there immediately. If you’re running a Walbro and an adjustable fuel pressure regulator and no gauge then you might as well spit into the wind. Get a gauge.
 

5SpdTy

Member
Re: Need Some Help Please

Re: Need Some Help Please

i have a gauge i just need to get it hooked up, its at my buddies house. also the pump was turning on for 2 seconds when i turn the ignition on but now it doesnt. so i know something is wrong with either the pump its self or the wiring. my question is would the fuel pump going make the truck act the way it did in my first decription. ps: the truck wont start now at all
 

Don W.

Stab it and steer it
Re: Need Some Help Please

Re: Need Some Help Please

Fuel pump no go = no fuel = no run. But before you pull it check wireing. Running the tank dry shouldn't make any difference IMO. Try banging on the fuel tank with a mallot or something to jog the pump back to life.

If the pump then runs for 2 secs and the truck tries to start but won't keep going then I'd suspect the oil pump switch. There's a oil pump switch that keeps the pump running when there's oil pressure. Don't know right now where that switch is.

Either way you're lost without that guage....
 
Re: Need Some Help Please

Re: Need Some Help Please

I had to replace the pump in my Blazer after running the tank dry and trying to crank it too many times. The pump just got too hot I suppose.
 

5SpdTy

Member
Re: Need Some Help Please

Re: Need Some Help Please

ok now the truck runs fine. drove it round the block, up the srteet and back no problems , let it idle for 10 mins, no problem, and then drove it more, no problem:screwy: . it was just being a pain in the azz i guess:dunno: . its weird
 
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