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I have a 1990 300SE. When the engine is cold I have to crank the starter for almost a full minute before the engine starts. It will only catch on 2 or 3 cylinders at first. After a couple of minutes it will run on all 6 cylinders and I can then carefully increase RPM without it quitting. Once I get the RPM in the 1000-1500 range it runs fine, but will quit if I let it idle.

I have to let it warm up for about half an hour before I can shift into drive without the engine quitting. Once the engine has warmed up for half an hour it runs and idles fine like there is nothing wrong with it. I can continue to use the car all day as long as I don't let it sit for more than a couple of hours between running it.

My mechanic replaced the fuel injectors.
 

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1989 560SEC, 1989 560SEL, 1995 E420
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4,507 Posts
I'd recommend putting a fuel pressure guage on there and seeing where you are. Just fixed a hard start problem on a 300TE by finding the wrong differential pressure between upper and lower chambers on the fuel distributor.

Mike
 

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( 1984 mercedes 500SEC ) .. ( 1978 450SEL 6.9 ) .. ( 1967 PROJECT IM WORKING ON )
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when the car starts , how is the idle speed ? is it lower then 700 rpm , if so , check on the air valve control relay , there is a red fuse might had cut , or if not check on the cold start valve relay also and the valve is self , it might need to be replaced .
 

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1966 200 Diesel; 1985 500 SEL (wrecked); 1991 420 SEL; 1979 280E (Home Market); 1993 190E 2.6
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584 Posts
Sounds a little like CSV issues. Espescially since you only experience it when making a cold start. Easy to troubleshoot this part, and also rather easy to replace if that turns out to be the issue.
 
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