kxri318
Member
- Joined
- Jan 31, 2023
- Messages
- 96
- Reaction score
- 28
- Points
- 18
- Location
- Ohio
- Vehicle Year
- 1986
- Make / Model
- Ford Ranger
- Transmission
- Automatic
1986 Ranger 2.9 auto, ECU from 1988 Ranger 2.9 auto. The truck has been randomly missing for the last 2 years, replaced or checked literally everything except fuel pump, filters, and most of the wiring harness. Kept getting EGR codes even when all EGR related components were tested/replaced. I decided to just swap in a 88 Ranger ECU, temporarily remove EGR related components and vacuum lines, and make a block off plate for the egr and see what happens. Still seems to run nearly the same with the exception of it idling pretty low now (550 rpm), but that wasn't a big concern right now. It runs stupid rich, like 11 MPG, reeks of raw gas, and smokes everywhere kind of rich. Ran that rich before ECU swap too. Fuel pressure and regulator are both in spec and good. IAC valve doesn't seem to bring idle back up when the alternator is loaded up, also idle doesn't change when unplugged at warm idle. Unplugging the IAC does change the idle when its a high idle at cold start. Just weird behavior
I scanned it after taking it out for a 20ish min drive and got some KOEO codes and KOER codes, but not 100% sure what they mean in my current case. I didn't try driving it on the highway so overdrive was never used during the test drive.
KOEO
_______
86 - Adaptive fuel limit reached or 3-4 shift solenoid circuit failure.
95 - fuel pump secondary circuit fault
29 - insufficient input from the Vehicle Speed Sensor or programmable speedometer/odometer module
KOER
_______
18 - Spout circuit open or spark angle word circuit failure
74 - Brake on/off switch fault; not actuated
I scanned it after taking it out for a 20ish min drive and got some KOEO codes and KOER codes, but not 100% sure what they mean in my current case. I didn't try driving it on the highway so overdrive was never used during the test drive.
KOEO
_______
86 - Adaptive fuel limit reached or 3-4 shift solenoid circuit failure.
95 - fuel pump secondary circuit fault
29 - insufficient input from the Vehicle Speed Sensor or programmable speedometer/odometer module
KOER
_______
18 - Spout circuit open or spark angle word circuit failure
74 - Brake on/off switch fault; not actuated
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