I picked up a high mileage Cobra a while back that was completely stock and neglected from a maintenance standpoint. I've been able to resolve every single issue with the exception of a P0172 code.
Symptoms
- Erratic idle
- heavy fuel smell
- black smoke when stabbing gas
- Long crank times - it takes 3 key KOEO cycles to get 39psi. Pressure drops to 0 after ten seconds of turning off car.
- long term fuel trim appears maxed out at about -25%
Things I've done
- Looked for vacumm leaks
- verified no leaks between maf and throttle body
- changed o2 sensors
- changed plugs
- changed injectors
- changed fprs
It seems the long crank times and fuel pressure bleed off is fuel pump check valve related and I'm guessing not related to the p0172 code since it maintains fuel pressure when the engine is running??
Symptoms
- Erratic idle
- heavy fuel smell
- black smoke when stabbing gas
- Long crank times - it takes 3 key KOEO cycles to get 39psi. Pressure drops to 0 after ten seconds of turning off car.
- long term fuel trim appears maxed out at about -25%
Things I've done
- Looked for vacumm leaks
- verified no leaks between maf and throttle body
- changed o2 sensors
- changed plugs
- changed injectors
- changed fprs
It seems the long crank times and fuel pressure bleed off is fuel pump check valve related and I'm guessing not related to the p0172 code since it maintains fuel pressure when the engine is running??