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Drove my daughter to school this Morning and my.

Tiny
JOEBURK
  • MEMBER
  • 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?
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Wednesday, December 5th, 2012 AT 12:41 AM

9 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Recheck the fuel pressure-see below
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Wednesday, December 5th, 2012 AT 12:52 AM
Tiny
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Fuel pressure:
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Wednesday, December 5th, 2012 AT 12:54 AM
Tiny
JOEBURK
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  • 5 POSTS
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
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Wednesday, December 5th, 2012 AT 8:18 PM
Tiny
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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
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Wednesday, December 5th, 2012 AT 9:10 PM
Tiny
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You still need to check the fuel pressure if its within specs and also if the injectors are pulsing/energizing-
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Wednesday, December 5th, 2012 AT 9:48 PM
Tiny
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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?
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Thursday, December 6th, 2012 AT 8:12 PM
Tiny
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What liter engine is this-Are the injectors energizing?
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Thursday, December 6th, 2012 AT 10:00 PM
Tiny
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  • 5 POSTS
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.
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Thursday, December 6th, 2012 AT 10:36 PM
Tiny
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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
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Thursday, December 6th, 2012 AT 10:43 PM

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