I recallthat, on the ‘86 420, the ignition module was mounted on the steel fender liner which served as a heat sink. There was heat transfer paste between them and it was said to dry out and lose effectiveness so I removed the module, cleaned out the dried-up paste, and replaced it.
Is this true for the module on the 560 SL?
After replacing the fuel pump relay, it still hard-starts, like it needs a choke, but runs perfectly for 2-3 miles then dies suddenly. It will restart immediately but die within 20 feet, but the longer I wait ( and let it cool), the longer it will run after restarting, so the fault is obviously temperate-related.
Hard starting cold, like it needs a choke. I replaced the idle control module and cleaned the idle control valve but no change. The struggle continues...
If it seems like I don’t know what I am doing, well...

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Providing a home for these cars:
1951 Buick Special De Luxe
1977 Rolls-Royce Silver Wraith II
1970 Rolls-Royce Silver Shadow
1986 Mercedes-Benz 420 SEL
2005 Mercedes-Benz E 320 CDI
2012 GMC Sierra 1500 4X4
1927 Pierce-Arrow Series 80
1931 Pierce-Arrow Series 43
1926 Ford Model T coupe