WON'T TURN OVER WHEN IT'S COLD OUTSIDE...

2000 Mercedes Benz ML320

Tiny

shadrock

January, 3, 2012 AT 10:35 PM

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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3 Answers

Tiny

rasmataz

January, 3, 2012 AT 10:42 PM

Clean and test the idle air control valve and also test coolant temperature sensor

Tiny

shadrock

February, 3, 2012 AT 12:46 AM

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.

Tiny

rasmataz

February, 3, 2012 AT 7:50 PM

Is it cranking over and will not start? If so-Check the fuel pressure and also for injection pulses-

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