Car dies and stumbles when warm
07-06-2011, 07:48 PM
#1
Thread Starter
Join Date: Nov 2010
Location: CA
Posts: 13
Car dies and stumbles when warm
Im stumped trying to figure out what wrong. Everything runs fine until it hits closed loop and and then the car starts stumbling, cutting out when you rev it and missing until it eventually dies. Once the car dies, it wont immediately restart. I have to wait a few minutes and then it will restart. The car is a 2000 gt stick all stock. This all started after I changed out the fuel pump, any ideas as to what could be causing this?
Thanks
Thanks
07-07-2011, 10:35 AM
#3
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Any DTCs present?
Also you state that it runs fine "until it hits closed-loop", how does it run when hot and not in closed loop (fairly hard acceleration at more than 60% throttle)?
Also you state that it runs fine "until it hits closed-loop", how does it run when hot and not in closed loop (fairly hard acceleration at more than 60% throttle)?
Last edited by cliffyk; 07-07-2011 at 10:38 AM.
07-07-2011, 11:31 AM
#4
Thread Starter
Join Date: Nov 2010
Location: CA
Posts: 13
It runs fine until it hits about 160 and then the car starts missing and stumbling. I wish there was a dtc code, I left the car running for a while hoping it would get a code. Does the fuel computer change the pressure when warmed? It seems the pressure drops as soon as it gets warm
07-07-2011, 11:52 AM
#5
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
It runs fine until it hits about 160 and then the car starts missing and stumbling. I wish there was a dtc code, I left the car running for a while hoping it would get a code. Does the fuel computer change the pressure when warmed? It seems the pressure drops as soon as it gets warm
The real pressure should be 28-30psi with the engine idling (39-40psi minus the manifold vacuum in psi). The generic PID (mode 01, PID 0A) will always be 39-40psi at idle unless the fuel is very hot when the PCM can raise it to 50+psi.
Last edited by cliffyk; 07-07-2011 at 04:38 PM.
07-07-2011, 12:16 PM
#6
Thread Starter
Join Date: Nov 2010
Location: CA
Posts: 13
Im kinda just assuming the pressure is dropping because i dont have a gauge, but after the engine dies I check the valve on the rail and it seems like the is very little or no pressure compared to when i just primed it