1989 Ford Thunderbird Malfunction - Drive Train & Driveline


Question: I have a 1989 ford thunderbird 3.8 eng. auto trans. and it will not change into overdrive. drive works fine. have adjusted the tv cable and did not help.

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Technican: Have you checked the computer trouble codes?
Owner: no. will check the codes and get back to you.
Owner: checked computer codes and got a code 31-egr valve.
Technican: Disconnect the negative battery cable for a few minutes to clear the trouble code. reconnect the battery and take the car for a test drive. Pay attention and see if the check engine light comes on during test drive. If the light does come on recheck the codes.
Owner: ok - will try that and get back to you.
Owner: disconnected the battery cable and check eng light came back on shortly after starting eng. checked codes and got a 31 and 13.
Technican: Okay, you should repair the problem with the egr valve/circuit. Did the problem with the transmission appear before the check engine light came on for the egr valve?
Owner: the check eng light has been on long before the transmission problem.
Technican: Sorry I missed your response. Do you still need assistance.
Owner: yes I still need help.
Technican: "Try adding a bottle of TransX (available at your local autoparts store) to the transmisson fluid. This sometimes works if there is no internal damage already present."

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