Hi everyone I’m new here I have a 2000 mustang gt 4.6 I originally was having crank but new start issues replaced a fuel pump fuel filter still nothing did some research replace the body control module it starts now. It then dies after 5 to 10 seconds replaced the Iac valve and the map sensor also replace a sensor on the fuel rail it now runs but when I give it gas it just sputters really bad and if I try to drive it same thing it’s throwing a check engine light codes p0171 and p0174 I replaced the pcv valve but it’s still saying lean or a vacuum leak does anyone have and ideas thank you
Engine issues
- Thread starter Sp2000gt
- Start date
The stock fuel rail sensor is a high fail sensor even aftermarket sensors fail and wont produce a code, just wont run, stutter, and stumble. Your codes indicate lean condition suggesting unmetered air from the mass air meter. Look all the vacuum lines over real good. Maybe pull the lines off at each end to be sure they are dry especially the fuel rail sensor so that fuel isnt passing through the sensor. Check the air intake hose after the mass meter that it isnt cracked or that another hose attached isnt compromised. Its possible the mass meter needs cleaning or it simply has stopped working. Also recheck all cable connections and wiring that they look good.
The throttle body and the upper plenum have seals that typically do not degrade, but anything is possible and might need to be changed. If your car has the original intake manifold and does not have an aluminium crossover, they are prone to cracking.....most times at the water crossover area, but anything is possible and could crack anywhere allowing unmetered air in.
I hope you find the problem. We here to help, just keep us informed of what you do. We can help you track down the problem.
The throttle body and the upper plenum have seals that typically do not degrade, but anything is possible and might need to be changed. If your car has the original intake manifold and does not have an aluminium crossover, they are prone to cracking.....most times at the water crossover area, but anything is possible and could crack anywhere allowing unmetered air in.
I hope you find the problem. We here to help, just keep us informed of what you do. We can help you track down the problem.
Ok thank you I will try this and let you know
RAU03MACH
Legend
check the 02
