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Old 06-18-2003, 12:29 AM
ivorysdl ivorysdl is offline
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Join Date: Feb 2003
Location: Texas Hill Country
Posts: 6
Just had a very similar problem with my 87 300SDL (same body as yours). Problem occured after an A/C repair, and the problem was the rubber vacuum connection between the hard plastic line, and the transmission modulator had disintegrated (guess they "bumped" the hard plastic line while replacing the A/C hoses). Discovered several connectors between hard plastic lines and vacuum devises were soft or cracked, so I replaced all of them. Everything works great now, with a cheap and easy fix (transmission also shifts better than it has in years, so some of these may have been leaking for a while).

Fix the vacuum source first, even if it is an actuator, you still have to have a strong source to drive all the actuators.

Good luck
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