Mechanics

CHEVROLET SILVERADO FUEL PRESSURE PROBLEM

1997 Chevrolet Silverado • 270,000 miles

Drove my daughter to school this morning and my truck acted fine, when I got back home and was pulling into the driveway the truck acted like it wasnt getting fuel and tried to stall. It picked back up and I parked fine, I go to leave about an hour ago, the truck starts, idles up to 2500 RPM then idles rough, When I put it in drive it idled rough and jerked and died.

when I started it agian it idled up high again then died and engine made a "fluff" noise and smoked from the front.

Last week I replaced the spark plugs, coil, control module, and checked the wires cap and rotor.

I do have a small valve seal leak too as well.

Last weeks fuel pressure test ran a high 60 psi. Could it be the pump or pressure regulator?
Avatar
Joeburk
December 5, 2012.




Recheck the fuel pressure-see below


Tiny
Rasmataz
Dec 5, 2012.
Fuel pressure:


Tiny
Rasmataz
Dec 5, 2012.
I havent found a way to the store to get a tester yet, but when I try to start it it kind of "sputters" like it wants to start but doesnt. I think it is getting too much fuel somehow


Tiny
Joeburk
Dec 5, 2012.
Ok, I pulled the pump relay and tried to start it and it backfired LOUD out the tail pipe, I removed a plug to see if it was flooded and they dont seem to be, not wet or anything, the pump was priming until I pulled the relay


Tiny
Joeburk
Dec 5, 2012.
You still need to check the fuel pressure if its within specs and also if the injectors are pulsing/energizing-


Tiny
Rasmataz
Dec 5, 2012.
Did a fuel pressure test just now. It ran at 60 PSI while KOEO and ran 60-62 psi while trying to crank. That seems kind of low to me at crank but 60-65 are specs. Any ideas?


Tiny
Joeburk
Dec 6, 2012.
What liter engine is this-Are the injectors energizing?


Tiny
Rasmataz
Dec 6, 2012.
It is 5.7 Liter engine. How can I find out if the injectors are energizing? Do I have to take off the upper intake? When I did the test at KOEO, the fuel pressure got to 60. But started to drop immediately as well.
AD


Tiny
Joeburk
Dec 6, 2012.
The fuel pressure should remain steady for a few minutes not just drop immediately-open up the upper plenum and check for a leaky fuel pressure regulator/injectors


Tiny
Rasmataz
Dec 6, 2012.

AD