2002 Chevrolet Silverado 1500 4.8L

Tiny
GILBERT CASTRO
  • MEMBER
  • 2002 CHEVROLET TRUCK
My ruck idles very rough in cold mornings and live in Az so its not that cold.I first had problems with it not wanting to start on the first crank soon as I turned it off and tried again it started I would hold the ignition on it would just continue to turn over soon as I stop and try again it starts and I replaced the fuel regulator and added fuel treatments and nothing. My service light was on it went off when I replaced the regulaor runing out of ideas?
Thursday, February 1st, 2007 AT 10:42 AM

5 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Fuel filter/ have the fuel pressure checked, sometimes if the regulator pops it will run the pump at higher press causing it undo wear
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Friday, February 2nd, 2007 AT 1:13 PM
Tiny
GILBERT CASTRO
  • MEMBER
  • 7 POSTS
Not sure what was going on but I just Changed the fuel filter on my truck I remove the fuel pump relay to releave pressure when I went to place the relay back and noticed it was installed backwards along with the AC, DRL, and horn relays? So my real QUESTION is why would these things continue to work through the coil but I have to wait till morning to see if this fixed my idling problem
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Friday, February 2nd, 2007 AT 6:05 PM
Tiny
2CARPRO JACK
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Backwards? Yet everything worked, hmmmmmmm did it fix the rough idle?
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Saturday, February 3rd, 2007 AT 8:48 AM
Tiny
GILBERT CASTRO
  • MEMBER
  • 7 POSTS
Double checked the wiring diagram and relay, the coil pins run diagonal so it would not go through the coil it was just the pin numbers for the switch were not in the correct postion! Still having idle problems only in the morning and sometimes it dont start on the first crank. How can I check for a leaky fuel injector without a gauge I think if it was the fuel pump at high RPMS the truck should sputter or back fire or something?
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Saturday, February 3rd, 2007 AT 9:27 PM
Tiny
2CARPRO JACK
  • MECHANIC
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Sometimes the pump simply wont hold pressure in the system, so when you go to start it cold it needs to buid up press to run the engine
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Monday, February 5th, 2007 AT 10:37 AM

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