Quote:
Originally Posted by phipps
I have a 1999 Silverado with the 5.3L engine.
After driving it and shutting it off, if I go back out a short time later it starts hard. I have to give it gas and it stumbles the first few seconds but then runs fine. I will also occasionally smell raw fuel after it does this.
If it has sat and totally cooled down it starts right up.
Any thoughts on what is going on?
Gary
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Thanks,
since it does start good cold that means it should have the proper fuel pressure. whenever it is a hard start after engine is running then the injector leaking may be the problem. with a 99 the fuel regulator vacuum portion may be leaking fuel into the intake also flooding the engine.
use fuel gauge key on eng off see if the fuel pressure holds .. if it drops rapidly pull off the reg vac line see if it has fuel smells or fuel..if that's good then it maybe the injectors..pressures 53-62psi. engine running should be about 57 psi if perfect lower if the pump is loosing it... 50psi is the threshold on engine start. replace fuel filter @40K miles. cut open and see if its good or bad then adjust to your fuel supplier quality of product.
lastly if this is good then it maybe the ECT which at this age including the electrical connector needs replacing.. driver side of block next to #1 cyl.
these issues most times will not throw codes. this continuing will cause the converters to over heat and plug up.