Quote:
Originally Posted by cencarnacion
Hi Chuck,
My 87 300SDL also shifts hard. I'd like to make sure I do not have vacuum leak issues before I mess with the modulator. Can you kindly post the federal diagram?
Also, I checked the EGR valve with my Mityvac. I think it may have a leak. The vacuum reading holds initially but slowly goes down. Is this normal? I am thinking that it isn't.
Thanks.
Carlos
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Find the vacuum pump.
Just above the vacuum pump will be a five way connector. One from the pump.........two to the left side of the vehicle.........and two more to the right side of the vehicle. Disconnect and plug the vacuum supply to the right side of the vehicle. Everything on that side can be eliminated. Once you do this, your hard shifts will likely be fixed.
If you'd prefer a cleaner look, you can get an "F" connector from the dealer..........one supply from the pump.........and two for the left side of the vehicle.