Hey fellas I am having a heck of a time trouble shooting this cold start problem. Heres a little history on the blazer. I use this truck a couple of times a month and never had a problem starting up even after sitting for so long. A few months ago I decided to take her for a ride to the atm, probably a mile away and all of a sudden...
the truck just quit. So i get a tow and when we get it home, just for shts and giggles i tried starting and sure as sht it fired up. A couple days later i went to start it and it just cranked and cranked but would not fire up.
I checked for fuel pump noise and there wasn't any so i replaced it, went to start and nothing cranks but wont fire up. I shot some starter fluid in the air filter and it will start up after it stumbles alittle then it idles fine like normal. If i leave it on so it warms up i can shut her of and it will fire right up. Leave it over night and nothing...I have checked the coolant temp sensor by checking the resistance warm and after a cold rinse seems okay, 5 yrs or so ago i replaced the fuel injection spider, i have checked the egr for carbon, checked the iac valve for carbon and tested risistance between the terminals and its between 20-80ohms adjusted the pintle to 28mm although after starting the truck with ether it moves out but dosent go back to 28mm is this normal? I checked tps and and reads good, I installed a new fuel filter, and still nothing I am stumped am I missing something? I also peeked in the plenum and cant see any obvious signs of leaking around the pressure regulator. That reminds me i have to pick up a fuel pressure gauge to check that also picking up a coolant sensor just to rule that out even though mine reads like its working? I will check back and keep you updated.. thanks

 

Sure sounds like fuel supply is still your problem. Have you run a fuel pressure test? If so, what were the results? Also, when you are having the no start issue, have you tested the power supply and ground at the fuel pump?

 

Thanks for the reply swartlkk I did not get a chance to check the pressure, haven't tested power supply or ground but will do so and report back thanks again.

 

Leaky injector?