rustbucket
Bronco Guru
- Joined
- Mar 22, 2004
- Messages
- 1,579
Well, the old Rust Bucket is about to become the Old Boat Anchor, or Old Gator Trap after I roll it into the bayou!
Some of y'all (yes, we say y'all in the South) may have read some of my other threads over the past few months while I have been trying to get this thing back on the road.
I installed the 5.8 in '94 or '96 using a Motorsports harness, GT-40 upper and lower, 65mm Motorsports throttle body, Pro Flow (Pro-M) 70mm Mass Air Flow meter, and Ford OEM sensors. Ran fine.
After sitting, I have had a hard time getting the thing to idle properly. I replaced the IAC and fuel pressure regulator. Both made incremental improvements, but it still doesn't idle well, and hesitates under load at lower RPM's. I can rev it up in neutral or park, but once in gear, it misses and sputters. Smells a bit rich, too. Exhaust pops. When I try to start it, it takes several attempts, and it idles real low at around 500-600 RPM's for a few seconds, and gradually dies. I adjusted the idle to just above 1000 RPM's as a test, and it will stay idling, but it misses quite a bit. Still misses severely under load at low RPM's. Once in mid-range, it seems to pull much cleaner. It's as if it suddenly has power!
It's not the dizzy or TFI. Both replaced (yeah, I'm starting to throw parts at it%) )
I have check and rechecked for vacuum leaks. Used carb cleaner and propane.
Cleaned the injectors per instructions from fordfuelinjection.com, and replaced o-rings, screens and pintle caps (This could still be the problem).
Fuel pressure is fine. Replaced regulator anyway, as I was cleaning injectors (Why the H did the engineers decide putting the screws on the bottom of the fuel rail was a good idea?)
Checked codes, and got a 12 during KOER, indicating problems hitting upper rev limit during test, hence, I changed the IAC.
Gas tank was almost empty when I parked it. I have since filled about 8 gallons of fresh gas in the tank.
Replaced fuel filter.
Tested TPS. 1.08V at idle position, 4.50 at WOT. Nice linear sweep.
Unplugged MAF. No change.
Tested alternator output. Puts out 14+V.
Checked ground. ECU is grounded directly to negative battery terminal with a 10g wire. Resistance between negative battery terminal and block is zero.
I have not yet checked the O2 sensors, as I'm not getting any codes for them. Seems unlikely to be the culprit, but you never know with these things.
Also thinking the ECU may just be bad. Maybe the humidity down here, combined with no use for 4 years just killed it?
Am I missing something? Any suggestions?
Some of y'all (yes, we say y'all in the South) may have read some of my other threads over the past few months while I have been trying to get this thing back on the road.
I installed the 5.8 in '94 or '96 using a Motorsports harness, GT-40 upper and lower, 65mm Motorsports throttle body, Pro Flow (Pro-M) 70mm Mass Air Flow meter, and Ford OEM sensors. Ran fine.
After sitting, I have had a hard time getting the thing to idle properly. I replaced the IAC and fuel pressure regulator. Both made incremental improvements, but it still doesn't idle well, and hesitates under load at lower RPM's. I can rev it up in neutral or park, but once in gear, it misses and sputters. Smells a bit rich, too. Exhaust pops. When I try to start it, it takes several attempts, and it idles real low at around 500-600 RPM's for a few seconds, and gradually dies. I adjusted the idle to just above 1000 RPM's as a test, and it will stay idling, but it misses quite a bit. Still misses severely under load at low RPM's. Once in mid-range, it seems to pull much cleaner. It's as if it suddenly has power!
It's not the dizzy or TFI. Both replaced (yeah, I'm starting to throw parts at it%) )
I have check and rechecked for vacuum leaks. Used carb cleaner and propane.
Cleaned the injectors per instructions from fordfuelinjection.com, and replaced o-rings, screens and pintle caps (This could still be the problem).
Fuel pressure is fine. Replaced regulator anyway, as I was cleaning injectors (Why the H did the engineers decide putting the screws on the bottom of the fuel rail was a good idea?)
Checked codes, and got a 12 during KOER, indicating problems hitting upper rev limit during test, hence, I changed the IAC.
Gas tank was almost empty when I parked it. I have since filled about 8 gallons of fresh gas in the tank.
Replaced fuel filter.
Tested TPS. 1.08V at idle position, 4.50 at WOT. Nice linear sweep.
Unplugged MAF. No change.
Tested alternator output. Puts out 14+V.
Checked ground. ECU is grounded directly to negative battery terminal with a 10g wire. Resistance between negative battery terminal and block is zero.
I have not yet checked the O2 sensors, as I'm not getting any codes for them. Seems unlikely to be the culprit, but you never know with these things.
Also thinking the ECU may just be bad. Maybe the humidity down here, combined with no use for 4 years just killed it?
Am I missing something? Any suggestions?
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