Problem with my 1999 Chevy Silverado 1500
Engine size = 5.3 L
GM tech = MW
question = I have a 1999 Chevy Silverado that i bought about 2 months ago. Ever since i
bought it it has had a hard time starting except for first thing in the morning. I had the fuel
pump replaced and have been using Lucas Injector Cleaner with every tank of gas. The
problem never seemed to get better so i started to read online and i came across over 5
different cases where guys had the same exact problem and they replaced the fuel
pressure regulator and the truck has fired great ever since. I went out and bout a fuel
regulator and put it on and now the truck starts great every time, but now the fuel pump is
humming like it is running constantly while the truck is idling. It sounds like the pump is
running way to hard and it is vibrating in the gas tank and im not sure why this is
happening. There seems to be more a than usual amount of white smoke coming out of the
exhaust which tells me that it is burning to much fuel. I hope this is enough information for
you its kinda !
a hard problem to describe. Thank you.
MW:
The pump running all the time is normal. Electric pumps run constantly.
Changing the regulator should have nothing to do with changing the sound of the pump,
unless it is not a factory regulator and possibly rated at a different pressure than the
original.
That may also explain the smoke that makes you think is it running too rich.
If the pump is extremely noisey, then it may be starting to go bad.
White smoke can also be that it is burning a little coolant.
Engine size = 5.3 L
GM tech = MW
question = I have a 1999 Chevy Silverado that i bought about 2 months ago. Ever since i
bought it it has had a hard time starting except for first thing in the morning. I had the fuel
pump replaced and have been using Lucas Injector Cleaner with every tank of gas. The
problem never seemed to get better so i started to read online and i came across over 5
different cases where guys had the same exact problem and they replaced the fuel
pressure regulator and the truck has fired great ever since. I went out and bout a fuel
regulator and put it on and now the truck starts great every time, but now the fuel pump is
humming like it is running constantly while the truck is idling. It sounds like the pump is
running way to hard and it is vibrating in the gas tank and im not sure why this is
happening. There seems to be more a than usual amount of white smoke coming out of the
exhaust which tells me that it is burning to much fuel. I hope this is enough information for
you its kinda !
a hard problem to describe. Thank you.
MW:
The pump running all the time is normal. Electric pumps run constantly.
Changing the regulator should have nothing to do with changing the sound of the pump,
unless it is not a factory regulator and possibly rated at a different pressure than the
original.
That may also explain the smoke that makes you think is it running too rich.
If the pump is extremely noisey, then it may be starting to go bad.
White smoke can also be that it is burning a little coolant.
Chevy Silverado
5.3L
work done to repair = changed plugs/wires and distributer cap and rotor
tech = JK
question = seems like a misfire when cold but ok when warm. Changed
plugs seemed to cure for a couple of trips then started again. Change
wires and distributer/cap seemed to be cured then started again. Checked for
trouble codes and there is none. Runs fine when warmed to operating
temp. Stumped? If there is a misfire should get a code or pretty much any
other problem but none show up.
This sounds like you may have a leaking intake manifold gaskets. These are know for
leaking. They have been re-designed by GM to correct the problem of they shrink over
time, do not seal when cold, then seal when warmed up. You can check this by... More
5.3L
work done to repair = changed plugs/wires and distributer cap and rotor
tech = JK
question = seems like a misfire when cold but ok when warm. Changed
plugs seemed to cure for a couple of trips then started again. Change
wires and distributer/cap seemed to be cured then started again. Checked for
trouble codes and there is none. Runs fine when warmed to operating
temp. Stumped? If there is a misfire should get a code or pretty much any
other problem but none show up.
This sounds like you may have a leaking intake manifold gaskets. These are know for
leaking. They have been re-designed by GM to correct the problem of they shrink over
time, do not seal when cold, then seal when warmed up. You can check this by... More