Hard Cold Start runs great after warming up?

1993 MERCEDES BENZ 190E
126,000 MILES • 6 CYL • 2WD • AUTOMATIC
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HENRYEARL
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  • 1 POST
1993, 190e, 2.6 Mercedes runs great after warming up. Hard cold starts with a 70 degree day, restart 15 times with short idle times, steady increasing idle time between starts. When engine temperature rises it runs great all day. Note: I have replaced the (3)three sensors mounted on top rear of head.

Henryearl
Dec 16, 2007 at 11:00 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
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Have the coolant temperature sensor and cold statrt valve check and idle speed air valve.
Dec 16, 2007 at 11:08 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,840 POSTS
  • ASE Certified Mechanic
I agree with RASMATAZ, it sounds like the cold start valve is not working or needs to be cleaned here is a guide to help and I have included the location of the cold start valve in the images below so you can check it out.

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Check out the images (below). Please let us know what happens.
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