- Joined
- Jul 11, 2011
- Messages
- 660
- Reaction score
- 129
- Points
- 43
- Location
- Central Texas
- Vehicle Year
- 1992
- Make / Model
- Ford
- Engine Type
- V8
- Engine Size
- 5.0
- Transmission
- Manual
- 2WD / 4WD
- 4WD
I've got a 5.0 with GT40P heads, Explorer intake, EFI obviously, A9L ECU from a 1989 Mustang. It has always thrown a TPS code (23) no matter which TPS I use and I've tried several including Explorer, a new mustang TPS, and some old ones I had laying around.
I've never been able to get the base voltage close and consistently get .2 volts with the throttle closed. Voltage from the ECU is never more than 4.5 volts. WOT is .95 max. I cleaned all the grounding points for the ECU and got no change. (I've always used a digital VM to check it and I have 3 different meters--all give the same readings)
It starts and drives well, but I think it is running pretty rich. One of the Explorer TPSs kept giving a CEL when the throttle position was changed, so I swapped that out and now no CEL. MPG is pretty consistently 14 which I think could be better if I got this fixed. It idles at 750-850.
I'm beginning to think it is an ECU issue. BTW, ACT and Coolant Temp sensor are new)
Anyone see something I'm missing? Something else I should try?
I've never been able to get the base voltage close and consistently get .2 volts with the throttle closed. Voltage from the ECU is never more than 4.5 volts. WOT is .95 max. I cleaned all the grounding points for the ECU and got no change. (I've always used a digital VM to check it and I have 3 different meters--all give the same readings)
It starts and drives well, but I think it is running pretty rich. One of the Explorer TPSs kept giving a CEL when the throttle position was changed, so I swapped that out and now no CEL. MPG is pretty consistently 14 which I think could be better if I got this fixed. It idles at 750-850.
I'm beginning to think it is an ECU issue. BTW, ACT and Coolant Temp sensor are new)
Anyone see something I'm missing? Something else I should try?