Hi all - I have a 93 240 that I am trying to bring back to life. Everything is working well except the overdrive solenoid. I have replaced the relay with one I "think" works - it's from my other 240, which when I press the button, lights up the arrow on the dash but does not activate overdrive (however I have no problem with the car going into 4th gear). I don't care if overdrive works as long as it goes into 4th.

When I put the relay in the 93, the button/arrow light work, but I am locked out of 4th. I have tried to loosen the bolts holding the solenoid, but they won't budge (even after many days of PB blaster application and working with a flexible 12 mm rachet wrench).

I would like to know if the solenoid in the 93 is really not working. My question is - can the relay light up the arrow and not send electricity to the solenoid? The wires appear to be in good shape.

Also, is there some way to bypass the relay and check if the solenoid functions? I could get a new relay but if the solenoid is bad and I eliminate it, then it's just a waste of money to purchase the relay.

Thanks!

John