Sierra hard start when cold *I searched*

[racindego]

Hey guys, I am new here and was wondering if you could help. I have searched all over and can't come up with anything.

 

I have an 01 Sierra 2500HD with a 6.0 litre. When the truck is cold, the cranking time seems to have gotten longer all of a sudden. Not obnoxiously so, like others have experienced, just noticeably longer. It also sometimes stumbles a little before it starts. When it is warm, it doesn't seem to do this. It fires right up.

 

Now, I have searched this forum and came to the conclusion that it was probably a fuel pump check valve or a fuel pressure regulator. The thing is, if I turn the ignition on and off a few times before starting it cold (to theoretically pressurize the injectors, if they did bleed down for some reason) the problem is just as noticeable. This doesn't seem to help at all.

 

I put a fuel pressure gauge on the truck and got around 55 psi with the key on. Pressure held after I turned the key off for well over 10 minutes without dropping at all. Also, there is no gas in my regulator vacuum line.

 

Help.

[racindego]

 

bump.

[RaysZ71]

    bump.

 

<{POST_SNAPBACK}>

 

 

 

 

Sounds like the fuel pressure regulator. Mine did this and it also would have a little black smoke on startup. Replace the fuel pressure regulator and all was back to normal.