Is there a temperature input into the timing adjustment?

If it is carbon build up (which considering the miles is very likely) what is the best way to remove it? I saw where some suggested spraying carb cleaner in the intake (with air cleaner removed) .

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)