1995 blazer 4.3 cmfi cold start problems
#1
1995 blazer 4.3 cmfi cold start problems
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
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
#2
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?
#3
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.
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