Starting problem

KEVIN DALY

MEMBER
1999 GMC C1500
5.3L
V8
4WD
AUTOMATIC
150,000 MILES

After I have driven the vehicle at high speeds of 75 to 80MPH I will turn the truck off and when I come back to start the truck a couple of hours later it will be hard to start and then when it does start it makes a terrible noise. The noise does stop. If drive the truck at normal speeds this does not happen.

2 Replies

SQM

MECHANIC
6,383 POSTS

Hello,

When you issue with the hard start, does it crank freely or slow to crank?

Can you please upload a video, so we can hear the noise?

https://www.2carpros.com/articles/engine-noises

Does the truck run hotter than usual?

Let me know.
Thank you.

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Saturday, October 16th, 2021 AT 2:45 PM

KASEKENNY

MECHANIC
18,907 POSTS

Just to jump in with a thought, a video will help but we also need to check the fuel pressure when this is happening as it may not be related to the speed.

This may be a coincidence because the vehicle does not care how fast it is being driven so if it goes to overdrive while driving 50 MPH or 75 MPH it doesn't really know the difference.

Here are a couple more guides that will help with this issue:

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

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

Have you been able to verify test this speed related issue? Meaning have you driven the exact same route going 75 and then going a speed that this does not happen and confirmed the speed is the only variable?

Let us know and either SQM or myself will get back to you.

Thanks

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Sunday, October 17th, 2021 AT 4:30 PM