Yes correct but much easier would be to take a clear photo of the cold start lever after the engine has been running and fully warmed up, and take another photo after the engine has had an extended cold soak. Or vice versa. Compare the lever position, that should tell you if the waxstat is functioning.
BUT: Doesn't a waxstat failure cause an "always on" condition? If the waxstat fails it will never allow the CX timing adv./idle speed increase lever to move to "warmed up" mode? So the IP will eternally be stuck in "cold" mode.
That's why those of us with failed waxstats have to disengage the end of the cable stop to let the engine run normally.
Properly tuned, the greenbook states there should be a 200 RPM difference between hot and cold idle speed.
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1985 744 gle d24t
1985 745 gle d24t
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