Intermittent long cranks, long exaggerated starts

[Kokum9395]

https://photos.app.goo.gl/1oFWvSdHXdvP9zWS8

 

You should be able to click the link I posted above and see a video that I made about this issue

 

Everything that has been replaced is outlined in the video. I did not simply load the parts Canon. I went through an official diagnosis and parts were replaced accordingly. It runs fine but we have the occasional intermittent long exaggerated crank after running for a little while and it getting to operating temperature. If you go into the store and come back out it will give you a hard time 2003 6.0 sierra quadrasteer

 

 

 

 

 

 

[dna9656]

Kevin;

         You sure talk like a mechanic! How refreshing! I'm retired now but have been in Maintenance for 38 years, Aircraft mech. and vehicle and vehicle body mech. for the USAF for 20 years, and worked in a shipyard for another 18. I have seen a lot of %^$&!

         GM has a term they call "cold soak", that's a time (8 hours I think) the vehicle sits to totally cool off, then they trouble shoot in cases like yours. I think everyone that has responded to your very clear and well thought out video explanation of the issues knows that it has SOMETHING to do with temperature.

         The fuel pressure (as I understand it) cannot be in the ball park, it HAS to be spec. Where is the regulator located? Near the engine I bet. Could it be getting warm, expanding and allowing low or higher pressure than spec? Try a hot and cold pressure check and fuel volume too.

         As you mentioned in your video maybe a pin in a electrical plug has some corrosion or moisture in it? It could be a component in a computer gets warm or a busted solder joint (due to heat) moves just enough to cause your problem. What ever it is it's GOT to be heat related because, as you say, you go to the &^$%^%# Walmart and come out and the truck gives you ^&$%#*. That's a warm or hot soak period; heat is the issue and it's something that happens so seldom it's not in the tech data.

         So ok, what are the things that cause weird ****** to happen not necessarily connected to heat?

#1 BAD or CORRODED GROUNDS,

#2 BAD or CORRODED electrical connections inside a "weather proof plug" that is no longer "weather proof" due to age or damage.

#3 INTERNAL issues with electrical components like a busted solder joint, a capacitor, resistor,

contactor in a relay or other inside the computers.

#4 vacuum circuits, not seen much these days. Hardly worth mentioning.

#5 This just occurred to me; it's a long shot fersure... coolant getting someplace it doesn't belong causing a short? Engine warms up, a crack in a hose opens due to pressure/heat, sprays some coolant someplace it doesn't belong.

I would REALLY like to know what you find and would like to know the solution too, just like every other working person (got to be PC) here.

Good luck we're with you!

I think your resolution lies along these conditions

 

Doug

 

Edited December 2, 2021 by dna9656

[asilverblazer]

22 hours ago, Kokum9395 said:

It runs fine but we have the occasional intermittent long exaggerated crank after running for a little while and it getting to operating temperature. If you go into the store and come back out it will give you a hard time 2003 6.0 sierra quadrasteer

 I didn't watch the video - was the fuel pressure regulator changed? Sticky check valve in the fuel pump assembly?

[joe1000]

Was this issue resolved?  I am having the same problem on my 2006 2500 Silverado.