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My truck is hard to start?

Tiny
GOODFELLAS1957
  • MEMBER
  • 35 POSTS
R placed spark wires they were oem truck runs great!
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Nice work, we are here to help, please use 2CarPros anytime.
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
BIGMOLILMO
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
I have a chevorlet 2000 silverado 4x4 5.3 here lately its been hard to start before it would start on the first try and now it take about 2, 3, 4, cranks before it starts any ideas where to begin
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,289 POSTS
Start by checking fuel pump pressure. I am most interested in drop off pressure. That is when the key is turned off. How quickly does the pressure drop.

Here is a how to for checking. Let me know what you find.

https://www.2carpros.com/how_to/how_to_check_fuel_pressure.htm
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
MAPLE
  • MEMBER
  • 1 POST
  • 2000 CHEVROLET SILVERADO
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 88,000 MILES
About 50% of the time the truck will crank over but will not start. When I hit the starter 2nd time it fires right up. It had a new fuel pump put in about 30,000 miles ago and I never let the truck go below 1/4 tank, so I don't think it the fuel pump. It has had this problem for about 750 miles, and I'm afraid that it will not start someday. Thanks for your help Brad
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,289 POSTS
Brad, try this. Turn the key from off to the run position and wait a few seconds each time. Do it 3 times and on the 4th, see if it starts quickly. Even though you have a newer fuel pump, that doesn't mean it is building pressure quickly enough. There could be a leak bleeding pressure from the system, the pump may be getting what I call, lazy, there could be a fuel pump relay issue.
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
SILVERADO2000
  • MEMBER
  • 2 POSTS
  • 2000 CHEVROLET SILVERADO
  • 4.8L
  • V8
  • 4WD
  • AUTOMATIC
  • 32,000 MILES
Vehicle only has 32,000 miles. Battery is good, air filter clean. When starting cold (as low as 20 degrees F) the truck starts fine. When hot it starts fine. Problem is that if I shut the truck off for more than 10 - 60 minutes, it cranks many seconds before starting. My solution (as the manual states) is to push the accelerator to the floor and then, the truck starts right up. I've tried the three time ignition trick (holding the key on for three seconds each time) and this seems to have no effect. Problem seems to be heat related or vacuum loss. Does this problem sound familiar? Thank you
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Monday, January 25th, 2021 AT 11:51 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,973 POSTS
Hello,

This sounds like one of two things either the fuel pump is weak or you have a fuel pressure regulator leaking into the vacuum line which these trucks had problem with. Here is a guide to help you test it.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Can I ask if the truck is a z71?

Please let us know what you find. We are interested to see what it is.

Cheers, Ken
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Monday, January 25th, 2021 AT 11:51 AM (Merged)

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