Fuel rail pressure

[Brandon johnson]

Lots of short trips and maybe not getting up to operating temp everytime due to that fact....

Maybe a good 'ol Italian tune up is needed... @Galante

Haha just did a Google search of Italian tune up.

 

[kbuskill]

Lol... it's funny but engines need a good mix of driving conditions in order to stay clean and in good running order.

At 100k miles the plugs are due to be changed per the service manual anyway.

A good decarbonizing session, via trickling water through the PCV line, might help as well.

 

[Brandon johnson]

Lol... it's funny but engines need a good mix of driving conditions in order to stay clean and in good running order.

At 100k miles the plugs are due to be changed per the service manual anyway.

A good decarbonizing session, via trickling water through the PCV line, might help as well.

Couple weeks ago we went camping pulling a 28ft travel trailer and another trip in 2 weeks. It does get drove more on weekends. Thanks for the info.

 

[HiHoeSilver]

Maybe a can of Kreen through it.

 

[kbuskill]

Maybe a can of Kreen through it.

Kreen is great stuff... I have never ran any through the PCV line though... water seems to do the trick pretty well.

I have threatened pouring some through the fuel injector holes in the intake manifold and letting it sit for a bit before pulling the plugs and rotating the engine over to expel what's left before attempting to crank.... just to clean the pistons and rings and such.

 

[PG01]

Lots of short trips and maybe not getting up to operating temp everytime due to that fact....

Maybe a good 'ol Italian tune up is needed... @Galante

Ha my father used get on the pkway or thruway and romp on the gas....used to say ‘ya gotta get on it every once and a while....blows the carbon out’ @kbuskill

 

[kbuskill]

Ha my father used get on the pkway or thruway and romp on the gas....used to say ‘ya gotta get on it every once and a while....blows the carbon out’ @kbuskill

So true!!!

 

[Brandon johnson]

Alright. I'm back at it. Still same issue, got a pressure test to it and while idle it has close to 60 psi but when turned off it drops pressure real quick and doesn't hold it. Fuel pump for sure then?
Not leaking gas and no gass vapor smells.

 

[swathdiver]

Alright. I'm back at it. Still same issue, got a pressure test to it and while idle it has close to 60 psi but when turned off it drops pressure real quick and doesn't hold it. Fuel pump for sure then?
Not leaking gas and no gass vapor smells.

Could be a leaky injector but is probably the fuel pump module.

GMs troubleshooting guide uses the Tech2, a digital fuel pressure gauge and a fuel line shut off adapter to check everything out. But those two items are the culprits in any case. Is your gas mileage abnormal, any plugs wet when you pull them out? Without all that fancy equipment you could check for a leaky injector by looking in your cylinder chambers with the plug out, using a white rope or something to make it easy to detect fuel leaking.

 

[Rocket Man]

Alright. I'm back at it. Still same issue, got a pressure test to it and while idle it has close to 60 psi but when turned off it drops pressure real quick and doesn't hold it. Fuel pump for sure then?
Not leaking gas and no gass vapor smells.

I had an issue with the FPR leaking down on my 02 but I believe the NNBS moved that to the fuel pump module? I just replaced my fuel pump and it wasn't as bad as I thought it would be but it wasn't easy either. Good luck.