2000 GMC 1500 with an unusual starting problem

tpurer · #1 03-07-2006, 01:31 PM

I have a 2000 GMC 1500 Sierra truck with a 5.3 V8, and it has an unusual starting problem. It always starts great in the morning when the engine is cold and the vehicle has set over night. If I drive it for 15 or more miles enough so that the engine is up to operating temperate and let it set for a just few minutes it starts without a problem, but if it set for hour or more it is hard to start. It also idles badly and there is smell of gas, and my gas mileage has dropped.

tpurer · #2 03-07-2006, 01:34 PM

[quote=tpurer]I have a 2000 GMC 1500 Sierra truck with a 5.3 V8, and it has an unusual starting problem. It always starts great in the morning when the engine is cold and the vehicle has set over night. If I drive it for 15 or more miles enough so that the engine is up to operating temperate and let it set for a just few minutes it starts without a problem, but if it set for hour or more it is hard to start. It also idles badly and there is smell of gas, and my gas mileage has dropped. I just replaced the sparkplugs, but this did not help.

2000CAYukon · #3 03-07-2006, 07:59 PM

Most likely, your fuel pressure regulator is bad and leaking fuel. The fuel evaporates over night and that is why it starts easy in the morning. After a hour, the engine is flooded and runs rough (you also smell gas). Not enough gas leaks in a few minutes so it starts fine then.

//2000CAYukon

reagmj · #4 01-03-2010, 07:22 PM

I have a similar problem. I have changed spark plugs, fuel pump assembly, and fuel pressure regulator but still have the same problem. I also notice some surging at steady speads. I am going to try replacing the injectors next. I would appeciate any other sugestions.

rjinmt · #5 07-21-2010, 01:17 PM

Quote:

Originally Posted by reagmj

I have a similar problem. I have changed spark plugs, fuel pump assembly, and fuel pressure regulator but still have the same problem. I also notice some surging at steady speads. I am going to try replacing the injectors next. I would appeciate any other sugestions.

ours was doing the same thing and replaced the mass air flow and it fixed the problem

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