Quote:
Originally Posted by sreilly77
Hey everyone. I'm new to the Silverado forum and need some help. I have a 2003 Silverado 4.8L 4x4 and I've been having some issues with hard starts. In the morning, when the engine is cold, the truck starts right up without any issues. If I go to shut it off and then start it up again, it starts right back up again with no issues. However, if I let it sit for more than a half and hour, the truck struggles to start. It cranks, tries to fire two or three times, then finally fires up and runs perfectly smooth. This usually takes about 4 to 5 seconds before it starts up. I've cleaned the throttle body real good (which was really dirty), replaced the fuel pressure regulator, purge valve canister, fuel filter, and fuel pump. I've also dumped two cans of fuel injector cleaner in the tank as well (I have a 34 gallon tank). I can't figure out for the life of me why my truck is doing this, and it's not throwing any codes! But, I have begin to notice that this happens more often when the tank is full. The more fuel I burn, the better the truck starts all the time.
Hopefully someone could help me out. I know hard starting is a common problem with the Silverado's, but I can seem to find any posts that have similar symptoms that I'm having. Thanks in advance!
|
with this no DTC found the usual component is the ECT. when this reports the wrong engine temp it will cause the fuel mixture to be incorrect . 10 years of use they get out of proper cal.
what was the fuel pressure results before and after the part replacements. also check for pressure drop on key on engine off test. should hold for a few minutes or drop very little.