I am having trouble getting my speedo working again. I haven't had it working since I swapped in the 5.0 HO and the t-5 tranny. I broke the speed sensor in the original AOD transmission upon removal of the old engine so I tried just hooking up the mustang speed sensor no luck, so I bought a new one, no luck. Then I took the upper portion of the original t-bird AOD sensor and swapped it into the lower shaft portion from the mustang sensor but that didn't work either. I have used the plastic gear from the mustang each time I put a sensor in. Occasional I will see the speedo go up to like 2 or 3 mph and a tenth of a mile will register on the odometer but thats it. What could cause the digital speedo to not get a signal? How can I troubleshoot this issue? As far as I know I have not touched any of the wires going to the sensor. I checked them from the grommet to the sensor and the wires looked good. Any help would be much appreciated. I am taking the car out of town next weekend and would like to know how fast I am going. Thanks, Jason.
Something weird I noticed today is that the speedometer only registers while make moderate to hard stops. I tested this theory today and did several hard stops and got it to register 4 mph while doing the braking. After which it just returns to 0 mph and stays there. I can't figure out if its in the tranny or something electrical. Has anyone ever had anything like this happen before?
Sounds like a wire chaffing on something to me...
Is the harness to the speed sensor O.K?Perhaps you need one from a 5 speed car?Just a thought.
Well, I didn't see any different wiring diagrams called out in the EVTM for the 85 T-bird for the speed sensor. That leads me to believe that the manual tranny doesn't matter. How do I check to see if there is a good circuit at the plug? Thanks, Jason.