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2000 GT 4V swapped, no spedometer since swap

1522 Views 4 Replies 3 Participants Last post by  Djreibert2
Hey guys, so 6 months or so ago I bought a 80,000 mile 4V from a wrecked 99 cobra to swap into my 2000 GT. Love the 4V power, it runs great! For the swap I swapped in the motor, ecu, and wire harness from the Cobra into my GT. Turned PATS off through custom email tune. Kept my T45 from my GT and bolted it right up to the 4V. My problem is, ever since the swap, my spedometer has not worked. Everything else on the dash works perfect (rpm tach, temp, fuel, etc...)

Things I have tried to fix it that have not worked-
Replaced speed sensor in trans
Checked fuses
Replaced alternator (returned it after it didnt solve issue)
Installed a 99 cobra gauge cluster (cobras have 160 speedo vs. GT 150 speedo, thought there might be a calibration issue)

Like i said, it worked perfectly before the motor swap. My next thought is to take it to a dealership to have them take a look at it. Any other ideas before I take it to the stealership???

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Does your hand held turner allow for monitoring of operational PID's? If so, it would be a HUGE help to monitor what the PCM "thinks" the car's speed is.

Why is this important? Because on the 99+, the PCM "tells" the cluster what to display. If the speed is correct in the PCM, then we need to look for a break down between the PCM and cluster.

If the car's speed is wrong (or zero) in the PCM, then we need to look for a break down between the PCM and the OSS sensor.

There are differences in the wiring between the Cobra and GT. This may be a result of mix and matching. Or may be not related at all.
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