I will be THE MOST GRATEFULL PERSON ON EARTH FOR THIS QUESTION TO GET ANSWERED

Tiny
THOMAS WAGNER
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
Trying to be detailed without being confusing.
This truck was purchased a week ago and while the engine was warmed up well, I test drove it and it ran almost perfect. I bought it. The next day when it was cold it seemed to idle down to a point where it would sometimes cut out. During driving, after depressing the gas pedal there would be a second or two delay before the accelerator would engage almost throwing you back in your seat every time. If the gas pedal was depressed too much, it would have an even longer delay and might not accelerate at all. I had to learn to drive it w/ the quirks to get to work a couple days. I then had help to change out all of the spark plug wires, plugs, cap and rotor all of which needed attention badly, I also was advised to change the fuel pump. After doing so, the engine RAN AND STILL RUNS GREAT. But. ? IM NOT SURE WHAT IT ACTUALLY MADE RUN BETTER? "That makes almost no sense I know" but why I say that is, it basicly only left me with the problem of having the 2-3 second delary in acceleration when the gas pedal was pushed but when it acutually accelerated it was smoothe and powerfull. And it didn't seem to cut oout when it idles down so low. When it truck is good an warmed up; it is sometimes not even evident there is anything wrong with it. But after being cold? Forget about it. Regardless of cold or hot, the engine just has a major delay from time gas pedal is depressed to the time it actually accelerates and then jolting you back in the seat caue all that gas is finally igniting or something? Not sure. "Again", if the pedal is depressed too much it only makes the delay even longer but usually will cause it not to respond at all.

I can't afford a mechanic and am making wishes upon gods at 2carpros!
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Sunday, January 26th, 2014 AT 3:41 PM

3 Replies

Tiny
MLDANIELS2000
  • EXPERT
Those engines have an injector system that runs through the intake manifold. It can be replaced as one whole piece but is aggravating to remove from intake. Usually they only last around 180,000 miles. Fuel pump helped with fuel flow. Did you change the fuel filter? It's an inexpensive part that may show more improvement.
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Sunday, January 26th, 2014 AT 3:59 PM
Tiny
THOMAS WAGNER
  • MEMBER
I didn't change the fuel filter because it had appeared as if someone had recently changed it. The coloration of all areas around it and sediment from dirt, grease, ect, did not appear at all around the filter or few inches of line leading in and out of the filter; also there were noticeable bite marks on both nuts that resembled someone using vice grips but could tell the bites were fresh; so "assumed' it would be a good filter.
Whats frustrating me so badly is I know its nothing more than; the "correct" fix and all of a sudden the engine will be running perfectly and allow me to get to and from where I need to go dependably.
Anyway, it does seem obvious that the fuel filter was recently replaced but only speculatioin of course. Well, you sound like the type of person I just wish I had the money to have sitting in front of this thing for about 20min and you'd have this random answer ive been dying to get ahold of; but, I will donate as much as I can at least. Ill do anything you advice sir!

So think its worth placing another fuel filter in? Let me know more thoughts if you can. Thank you so much
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Sunday, January 26th, 2014 AT 6:43 PM
Tiny
MLDANIELS2000
  • EXPERT
Remove filter and drain filter out from reverse flow (drain out of inlet side into cup) and check for sediment and contamination. Also if you can get a hold of a fuel pressure gauge, can be gotten by auto part sore loaner program, check fuel pressure while running and check while power braking (parking brake engaged, one foot on brake and other giving light throttle while in gear) but do only in safe are where no person or thing can get run over and check fuel pressure during that.

Also might want to check timing, timing might be slightly off, hence hesitation during acceleration.
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Sunday, January 26th, 2014 AT 7:31 PM

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