03 chevy truck runs 2 seconds and then dies

slim · 01-05-2008, 09:06 PM

I have a 2003 chevy silverado 4.3L. It died driving down the road. Now it will start and run for 2 seconds then it dies. I have tried to scan it for codes. But it will not make a connection. I have reset the passlock. and reflashed the comp. The scanner still has no connection.

Hayden · 01-06-2008, 07:31 AM

Put a fuel pressure gauge on it and see what the reading is when you turn your key to on.(don't start it).

slim · 01-06-2008, 02:37 PM

It has 58 lbs. of pressure. it does not lose fuel pressure when it dies

stumpuller454 · 01-06-2008, 03:41 PM

that is way to much fuel pressure! this can cause just as much a problem as not enough pressure! its probly flooding your truck! may need to purchase a new pump! they have an internal regulator, but check for power at the pump, may be getting too much somehow, also check your ground,

mudseeker · 01-06-2008, 05:53 PM

not sure but i think the newer trucks require that much pressure. i think there is a cam sensor or something that deals with the fuel pump once the engine is started. maybe the oil pressure sensor.

Hayden · 01-06-2008, 09:00 PM

Yeah I agree with Mud, 58psi is about normal, I can't think of anything that'd shut down that quick to kill your engine. Can you start it right back up after it dies?

slim · 01-06-2008, 10:30 PM

Yes it starts everytime.

mudseeker · 01-07-2008, 09:46 AM

mr 75 could probably tell you but he seems to be on vacation, lucky

anyways, i'm pretty sure it has something to do with your oil pressure sensor. i think if the newer trucks do not sense oil pressure it cuts power to the pump in an atempt to save the engine.
might want to give the dealership a ring and try to confirm this idea.

red_atv · 01-08-2008, 11:57 PM

i dont know if 03 has a built in security system on it ,but on the 98 if the fuse is either pulled or blown it'll run for a few seconds then die.starts right back up runs for 2-3 secs. and dies again.

scottie · 01-09-2008, 12:01 PM

i bet it is the crank sensor. the engine turns over and starts running, and the PCM waits 2 seconds to receive the input from the crank sensor. if it doesnt receive the signal, it shuts the fuel pump off after 2 seconds.

01-05-2008, 09:06 PM	#1
slim Junior Member Join Date: Jan 2008 Posts: 3	03 chevy truck runs 2 seconds and then dies I have a 2003 chevy silverado 4.3L. It died driving down the road. Now it will start and run for 2 seconds then it dies. I have tried to scan it for codes. But it will not make a connection. I have reset the passlock. and reflashed the comp. The scanner still has no connection.

01-06-2008, 07:31 AM	#2
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 365	Put a fuel pressure gauge on it and see what the reading is when you turn your key to on.(don't start it). __________________ There Is No Replacement For Displacement

01-06-2008, 02:37 PM	#3
slim Junior Member Join Date: Jan 2008 Posts: 3	fuel pressure It has 58 lbs. of pressure. it does not lose fuel pressure when it dies Last edited by slim; 01-06-2008 at 04:26 PM.

01-06-2008, 05:53 PM	#5
mudseeker Moderator Join Date: Feb 2006 Location: michigan Posts: 3,934	not sure but i think the newer trucks require that much pressure. i think there is a cam sensor or something that deals with the fuel pump once the engine is started. maybe the oil pressure sensor. __________________ member map add yourself

01-06-2008, 09:00 PM	#6
Hayden Senior Member Join Date: May 2006 Location: Bay City,Michigan Posts: 365	Yeah I agree with Mud, 58psi is about normal, I can't think of anything that'd shut down that quick to kill your engine. Can you start it right back up after it dies? __________________ There Is No Replacement For Displacement

01-06-2008, 03:41 PM	#4
stumpuller454 Senior Member Join Date: Dec 2007 Location: Alberta Posts: 786	that is way to much fuel pressure! this can cause just as much a problem as not enough pressure! its probly flooding your truck! may need to purchase a new pump! they have an internal regulator, but check for power at the pump, may be getting too much somehow, also check your ground,

01-06-2008, 10:30 PM	#7
slim Junior Member Join Date: Jan 2008 Posts: 3	Yes it starts everytime.

01-07-2008, 09:46 AM	#8
mudseeker Moderator Join Date: Feb 2006 Location: michigan Posts: 3,934	mr 75 could probably tell you but he seems to be on vacation, lucky anyways, i'm pretty sure it has something to do with your oil pressure sensor. i think if the newer trucks do not sense oil pressure it cuts power to the pump in an atempt to save the engine. might want to give the dealership a ring and try to confirm this idea. __________________ member map add yourself

01-08-2008, 11:57 PM	#9
red_atv Junior Member Join Date: Jan 2008 Posts: 7	i dont know if 03 has a built in security system on it ,but on the 98 if the fuse is either pulled or blown it'll run for a few seconds then die.starts right back up runs for 2-3 secs. and dies again.

01-09-2008, 12:01 PM	#10
scottie Senior Member Join Date: Jan 2006 Location: South Florida (Palm Beach), originally from south of BOSTON Posts: 644	i bet it is the crank sensor. the engine turns over and starts running, and the PCM waits 2 seconds to receive the input from the crank sensor. if it doesnt receive the signal, it shuts the fuel pump off after 2 seconds. __________________ im a straight shooter with upper management written all over me

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