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Old 05-28-2002, 08:41 AM
Registered User
Join Date: May 2002
Posts: 27
560SEL hard start /rough idle

I am diagnosing this problem and have been through the search facility etc to determine next steps. I am getting closer but at a dead end for now. This is an 86 126/117 US version. I have been though the normal parts swapping to no change to the problem including- OVP relay,fuel pump relay,cold start injector, etc.

I am now looking at the EZL interraction with the coolant sensor which on start up as i understand defines timing based on the map in the EZL and sensor resistance. The sensor is working fine based on the resistance/temp table in the SM. When I unplug the sensor (2 pole version) both sides -- the car starts much better but then idles very rough. I also observe that disconnecting while running shuts off the air pump.

A real concern -pin 21 on my connector for the CIS control unit is unused (ie there is no cable using that pin) -- which according to the manual shoudl be the coolant temp sensor ???

Any thoughts on next steps would be appreciated.
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Old 05-28-2002, 08:53 AM
Registered User
Join Date: Dec 2001
Location: LaPorte, IN
Posts: 400
Plugs, wires, rotor?

PO had platinum plugs in our 560, idled rough, changed to copper and the idle smoothed out a lot. Then changed wires, improved more. Fresh distributor cap and rotor really finished the job. Hope this helps.
Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)
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