I've got a 1984 300DT. My cruise works perfect on the way home in the evenings but wont work well or at all in the mornings. In the mornings when it works, it will set, then speed up past the set point then let off completely down to 5 mph or so below set point. Im thinking it may be a connection that when hot expands from the heat and makes contact. When it is cold or cool it may not make contact??? Any help???

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2005 Accord Hybrid (Wifes)
1995 Subaru Impreza L AWD (Snow car)
1984 GMC Sierra 1500 (Mine)
1983 300CD Best $ I ever spent. (Mine)
1984 190D (sold and glad I did)
1983 300D (sold and wished I hadn't)

I have a similar problem, but the opposite: my cruise works in the morning when cool, never in the heat of day. I posted a question on this last week and basically got no response.

The mystery continues...!

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'81 300TD turbo <<sold 12/05 to another diesel nut

Try running a known, good cruise control amp.

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Jim

Nearly every cruise problem is either the amp (most likely) or the actuator on the engine. Amps can be had for less than $150 rebuilt.

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer

Replacement of all electrolytic capacitors in the amp module can remedy intermittent (temperature related) problems