Irregular starting

Tiny
JUSTICE SWEENEY
  • MEMBER
  • 2000 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 280,000 MILES
Truck has trouble starting when it’s cold. It will turn over just fine but won’t start immediately. It usually takes 2 or more tries, but once it catches the right amount of fuel, it gets going and stays running good. I’ve done a regular tune up (plugs, plug wires, fuel filter, ect.) Replaces the MAF Sensor, the fuel pump, the coolant temperature sensor, and I took off the steering column cover and tightly secured the little wiring harness that goes into the ignition cylinder. I’m not sure what else to try, any suggestions?
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Monday, January 13th, 2020 AT 10:09 PM

3 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

When it is cold, I would check the fuel pressure to b sure you have the proper fuel to the injectors. My concern is that an injector may be leaking down overnight resulting in no pressure in the morning.

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

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

When it does not start, does the tachometer move up a little while cranking?

Is the check engine light on? If it is, do you know the code?

Roy
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Tuesday, January 14th, 2020 AT 2:49 AM
Tiny
JUSTICE SWEENEY
  • MEMBER
Unfortunately, I live in a town with no major auto parts store. So I m currently seeing if I can borrow a tester from a local shop. The service engine light was on, but after the MAF sensor was replaced, it went away. I m not sure on the tachometer, hopefully tonight it gets cold enough for me to check. Also, I m not sure if this is related or not, but once the truck shifts into gear, it drops it s rpm down for half a second and then continues as normal.
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Tuesday, January 14th, 2020 AT 3:45 PM
Tiny
ASEMASTER6371
  • EXPERT
That is normal.

Let me know when you can.

Roy
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Tuesday, January 14th, 2020 AT 3:49 PM

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