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ML320 won't turn over when it's cold outside.

Tiny
SHADROCK
  • MEMBER
  • 2000 MERCEDES BENZ ML320
  • 117,000 MILES
My ML320 runs like a horse until the temperature outside drops below 40 degrees F. When it turns cold, the truck will crank forever but not actually ignite. I have changed the CPS and ignition switch, the battery, the fuel pump, fuel filter, and corresponding wires, all to no avail. Any suggestions from here? Thanks for any advice
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Tuesday, January 3rd, 2012 AT 10:35 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Clean and test the idle air control valve and also test coolant temperature sensor
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Tuesday, January 3rd, 2012 AT 10:42 PM
Tiny
SHADROCK
  • MEMBER
  • 2 POSTS
Ok. Tried both suggestions. No difference. Someone mentioned a mass air flow sensor, and after looking at the price (!) Wonder if there is a way to test it before I just up and change it. I'm still not getting any codes. No check engine light. Nothing. It just won't turn over under 40 degrees.
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Friday, February 3rd, 2012 AT 12:46 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Is it cranking over and will not start? If so-Check the fuel pressure and also for injection pulses-
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Friday, February 3rd, 2012 AT 7:50 PM

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