- Joined
- Jun 2, 2012
- Messages
- 25,363
- Reaction score
- 8,370
- Points
- 113
- Location
- canada
- Vehicle Year
- 1994
- Make / Model
- Ford
- Transmission
- Manual
Back port on the PCM is for programming, its not used for operation
Do you have the vacuum hose hooked to FPR(fuel pressure regulator), its a direct hose to intake vacuum
If needs that to pull down fuel pressure at idle
But FPR may be failing as I would expect it to top out and open on its own at 65psi
In 1987 I would expect EVAP to be that way, no purge valve or pressure sensor
throttle body port------------CCAN------------gas tank
Simple system
One its up and running and you get any Codes for EVAP then it may need those, but for now just see what happens, it won't effect engine operation, its strictly a fuel vapor emissions system
Do you have the vacuum hose hooked to FPR(fuel pressure regulator), its a direct hose to intake vacuum
If needs that to pull down fuel pressure at idle
But FPR may be failing as I would expect it to top out and open on its own at 65psi
In 1987 I would expect EVAP to be that way, no purge valve or pressure sensor
throttle body port------------CCAN------------gas tank
Simple system
One its up and running and you get any Codes for EVAP then it may need those, but for now just see what happens, it won't effect engine operation, its strictly a fuel vapor emissions system