- Joined
- Sep 22, 2007
- Messages
- 12,348
- Reaction score
- 7,419
- Points
- 113
- Location
- Michigan
- Vehicle Year
- 1987
- Make / Model
- Ford
- Engine Type
- 2.9 V6
- Engine Size
- 177 CID
- Transmission
- Manual
- 2WD / 4WD
- 2WD
- My credo
- A legend to the old man, a hero to the child...
Ok....
Rechecked fuel pressure again. This time had a helper so i was able to read the gauge faster. Noticed some interesting stuff i missed before....
With a KOEO fuel pump prime, gauge would jump to 35-40lbs, but then drop to zero as fast as it climbed.
With a KOER running test i was only getting 33 lbs of pressure, but it would climb to 40 when the engine was revved. Yank the vaccuum line it climbed to 41 even at idle with no flucuation to speak of.
Thought maybe, just maybe it was a stuck open injector. Thought it was odd that would cause a lean code, but shit nothing else had made sense this far.
So, i unhooked the gauge, primed the pump, sat for a sec, and pulled a plug. Repeated this process for all 6. Not ONE was soaked with fuel, carbon fouled, nothing.
So i think i can rule out a stuck open injector.
Now, if it was stuck closed/plugged injector the fuel pressure shouldnt drop so quick...correct? I read the check valve is in the high pressure pump assembly, which is new.
I ordered a new FPR. Am i barking up the wrong tree with this conclusion? I read a few threads here and there that said FPRs dont always fail rich....
Input?
Rechecked fuel pressure again. This time had a helper so i was able to read the gauge faster. Noticed some interesting stuff i missed before....
With a KOEO fuel pump prime, gauge would jump to 35-40lbs, but then drop to zero as fast as it climbed.
With a KOER running test i was only getting 33 lbs of pressure, but it would climb to 40 when the engine was revved. Yank the vaccuum line it climbed to 41 even at idle with no flucuation to speak of.
Thought maybe, just maybe it was a stuck open injector. Thought it was odd that would cause a lean code, but shit nothing else had made sense this far.
So, i unhooked the gauge, primed the pump, sat for a sec, and pulled a plug. Repeated this process for all 6. Not ONE was soaked with fuel, carbon fouled, nothing.
So i think i can rule out a stuck open injector.
Now, if it was stuck closed/plugged injector the fuel pressure shouldnt drop so quick...correct? I read the check valve is in the high pressure pump assembly, which is new.
I ordered a new FPR. Am i barking up the wrong tree with this conclusion? I read a few threads here and there that said FPRs dont always fail rich....
Input?