1998 Chevy Silverado
Engine size = 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. Changed
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?????
JK:
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 spraying carb. cleaner around the bottom of the intake, and listen for any
change in idle.
You may also want to clean the throttle bore and plate. When these get a little
carbon on them, they can cause idle problems as well.
Back
Engine size = 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. Changed
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?????
JK:
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 spraying carb. cleaner around the bottom of the intake, and listen for any
change in idle.
You may also want to clean the throttle bore and plate. When these get a little
carbon on them, they can cause idle problems as well.
Back
Problem with my 1999 Chevy Silverado 1500
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
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... Answer
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
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... Answer
Chevrolet Silverado Misfire When Cold
2002 Chevy 1/2 ton truck. 4.3L V6.
Warning lights: Service engine soon
Codes P0300 misfire.
Repairs: Replaced spark plugs & wires cap & rotor cleaned egr,cleaned inside throttle body with
Berrymans cleaner.
Question: I had it in a gm dealer. The mechanic said he doesn't know why the #4 cylinder has a
misfire. Checked injectors. Engine is jerking when i let off of the gas peddle. Engine misses when
i rev up the engine in park to about 2000rpm. Really noticeable when i drive in third gear.
Warning lights: Service engine soon
Codes P0300 misfire.
Repairs: Replaced spark plugs & wires cap & rotor cleaned egr,cleaned inside throttle body with
Berrymans cleaner.
Question: I had it in a gm dealer. The mechanic said he doesn't know why the #4 cylinder has a
misfire. Checked injectors. Engine is jerking when i let off of the gas peddle. Engine misses when
i rev up the engine in park to about 2000rpm. Really noticeable when i drive in third gear.
Not sure why the dealer mechanic would say he couldn't find out what
was wrong with it. Fuel injectors can fail two ways..They can fail
electrically or they can be plugged up inside. If it is definitely not a fuel
injector problem the next thing to check would be engine mechanical.
Have a compression test done. Have a cylinder leaked down test done.
This would show a problem in that cylinder with a valve or a valve seat.
was wrong with it. Fuel injectors can fail two ways..They can fail
electrically or they can be plugged up inside. If it is definitely not a fuel
injector problem the next thing to check would be engine mechanical.
Have a compression test done. Have a cylinder leaked down test done.
This would show a problem in that cylinder with a valve or a valve seat.
