- Joined
- Jun 2, 2012
- Messages
- 25,363
- Reaction score
- 8,370
- Points
- 113
- Location
- canada
- Vehicle Year
- 1994
- Make / Model
- Ford
- Transmission
- Manual
Secondary fuel code means computer didn't see 12volts on the 12v wire to the fuel pump at some point in the past
Primary fuel code references the fuel pump relay
No, there is no "extra" fuel pressure at any time, and no fuel pressure sensor in any case
Lack of fuel pressure at higher speed would set Lean code, for sure, and engine would be pinging/knocking like crazy, can't miss that
Too much fuel also causes a lack of power, but that should set Rich Code
If its not a fuel issue, that leaves compression or spark
18" of vacuum at idle should indicate compression is OK
I would test base spark timing just to take that off the table
Primary fuel code references the fuel pump relay
No, there is no "extra" fuel pressure at any time, and no fuel pressure sensor in any case
Lack of fuel pressure at higher speed would set Lean code, for sure, and engine would be pinging/knocking like crazy, can't miss that
Too much fuel also causes a lack of power, but that should set Rich Code
If its not a fuel issue, that leaves compression or spark
18" of vacuum at idle should indicate compression is OK
I would test base spark timing just to take that off the table