I have been having problems with a longer time to start my 560sl 1988
since it got colder during the first cold start of the day or when left sitting for a while
15 seconds , then idles fine
Checked the cold start valve
took it out hooked it up and started car no mist /spray
What voltage goes to the valve , so I can jumper it out to find if it is the valve or some other circuit that feeds it?
Is there any fuses in the circuit?
Any help would be appreciated

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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)

I can't recall how your cars coldstart is activated.

The main reason is that in over thirty years working on MBs I have only seen maybe two defective cold start valves and their problems were both leaking fuel. I have never seen a cold starting problem due to the cold start valve.

If any part of your problem exists when the starter is not engaged then you need to look elsewhere. I'm guessing you don't have any starting enrichment. The check is to look at EHA current during cranking.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

I put 12 volts to the valve while there was pressure in the system
It sprayed a nice pattern
You were correct It looks good as new
I also cleaned the IAC valve with cleaner
because it looked dirty
The engine is warm now cause of all the starting
so I got to wait
I read some threads on EHA
Will check this out
Thanks for the help

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[B]Mike Y.
00 sl500 sport
88 560 sl (sold)