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Gary
Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 15702
Experience:  15 years GM master tech
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I have a 1999 chevy c1500 with a 4.3 wont start it will with

Customer Question

i have a 1999 chevy c1500 with a 4.3 wont start it will with spray .ive put new fuel pump,fuel filter took out injectors and watched them spray. this just dont make sence please help
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.
MY name is Gary
I am sorry for the long wait
if you unplug the 2 wire ECT sensor will it start up and run without adding spray ?
if not if you plug that back in and unplug the TPS sensor on the throttle body will it start up ?
Customer: replied 1 year ago.
ect what is that dont ring a bell
Customer: replied 1 year ago.
i just tried starting with the tps unpluged =no start
Expert:  Gary replied 1 year ago.
engine coolant temp sensor should be located in the drivers side cylinder head 2 wire connector one yellow and one black wire
Customer: replied 1 year ago.
oh okay thank you .okay i unpluged ect =no start ran great whew day ago parked it and now this
Expert:  Gary replied 1 year ago.
can you see what the fuel pressure is reading key ON engine OFF ?
did you just fuel up recently ?
Customer: replied 1 year ago.
we will have to finish tomarrow
Expert:  Gary replied 1 year ago.
ok sounds good
Customer: replied 1 year ago.
okay with key on it goes up to 60 pounds of fuel preasure then drops down after few seconds
Expert:  Gary replied 1 year ago.
what does it drop down too in a few seconds ?
Customer: replied 1 year ago.
20 pounds
Expert:  Gary replied 1 year ago.
if you connect the fuel gauge to the fuel feed line into the fuel filter from the fuel tank will it hold or still drop to 20 within a second or two
Customer: replied 1 year ago.
i can,t fine a way to do from fuel pump
Expert:  Gary replied 1 year ago.
remove the fuel line that goes into the fuel filter then connect the gauge tester with a rubber hose and some hose clamps
Customer: replied 1 year ago.
i got the truck to run runs rough not a sharp clear pedal
Expert:  Gary replied 1 year ago.
did you fix the fuel pressure problem where now the fuel pressure is within spec ?
Customer: replied 1 year ago.
yes stays at 55 to 60 pounds
Expert:  Gary replied 1 year ago.
you replace the fuel pump ?have you driven it down the road and cleaned out the engine ?was the fuel filter replaced too ?
Customer: replied 1 year ago.
new fuel pump and filter no good enough to drive
Expert:  Gary replied 1 year ago.
is it skipping like it has a few dead cylinders and running very rough at idle ?
Customer: replied 1 year ago.
dont hear a miss nor does scanner find a mis
Expert:  Gary replied 1 year ago.
so i am unclear what the truck is doing now once it got running
Customer: replied 1 year ago.
runs rough and wants to die out, if to mush gas is aplyed. unless you graduly press gas pedal sorry for spelling