Date registered: Nov 2008
Vehicle: 1981 300TD 310k--1966 230 165k--1970 280se 172k
Location: Ohio City, Ohio
Mentioned: 1 Post(s)
Quoted: 33 Post(s)
While you are in there tinkering, you might want to check the function of the switch on the throttle plate shaft of the front carb that actuates the modulating pressure position on the 3-way transmission solenoid (if your car is automatic). On these old transmissions, it helps to keep the transmission from harsh downshifts into first gear when decelerating. It also affects the load on the engine when starting out. When cold and choked, the engine can overcome the load, but when hot and unchoked, it has a harder time.
May be a part or all of your problem.
For everyone's information, I believe the position of the plate in the heat riser is in the same plane as the slot that accepts the spring. Close to horizontal would be closed and vertical would be open. Or the weight is up in closed and down in open.
About the only thing vacuum does on this car is run the brake booster and the distributor advance. The advance can be tested using a Mityvac to see it actually move or seeing if the timing advances to 37 degrees BTDC at around 3000 rpm.
1981 300TD--310k miles
1970 280sel--172k miles
1966 230--162k miles