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5.3L Starting Issue
It won't be your fuel pump with pressures you show. I believe vapors from your fuel tank are going your engine. It happens when the engine is warm and opening the throttle helps it start. Next time, hold the throttle to the floor when you crank it and see if it catches and runs. Foot to the...- db0353
- Post #31
- Forum: Engine & Drivetrain
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5.3L Starting Issue
Check out the thread on this (Tahoe/Yukon)site: Conquering the (NNBS) P0449 Code. You aren't getting the code this fellow had but he shows some good photos with locations for the purge solenoid and canister purge valve. I wouldn't change them without checking their functionality. I like to...- db0353
- Post #27
- Forum: Engine & Drivetrain
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5.3L Starting Issue
My experience with hard starting in a way similar to yours was fuel and vapor from the tank dumping into the intake and flooding the engine. This generally happened when I filled the tank, but not always. It led to very long crank times but the engine would finally start. It would run raggedly...- db0353
- Post #25
- Forum: Engine & Drivetrain
