1990 560SEC DIFFICULT TO START

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Mikesmerc

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Jul 3, 2003
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Co.Cork IRL
Your Mercedes
2001 CL500,1990 560SEC, 1988 230E, 1982 250, 1979 280CE, 1977 200D, 1972 350 SL, 1965 220S Fintail
Any one know where the cold start sensor is located on a 560 and how do I test that its working. Does the cold start injector operate for a short time when starting with engine warmed up. Very difficult to start when cold (20 short turns of the key) but not as difficult when hot(5 short turns).
Stumbles on accelerating quickly, checked air pipes to injectors and seems fine. One thing I notice while trying to start it sometimes the fuel pump cuts in and doesnt stop pumping after I release the key and engine has not started, could this cause any of the symptoms I describe?
Any suggestions would be gratfully appreciated
Regards
Mike
 
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