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Old 01-27-2015, 01:58 PM
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Join Date: Jun 2010
Posts: 32
1997 E320 M104 Hard to start when cold

This mercedes will start perfectly after it starts,but if it sits overnight in the cold ,it will take quite a few cranks to get it started. I'll have to crank off and on for about 5 to seven minutes before it will start. Thanks for all your input.

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Old 01-27-2015, 02:16 PM
TnBob's Avatar
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Join Date: Dec 2009
Location: Shelbyville, Tn
Posts: 1,907
Fuel filter, fuel pump, fuel pump relay, plugs, distributor cap. are the most common places to start.
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."
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Old 01-28-2015, 09:13 AM
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Join Date: Aug 2002
Location: Southeastern PA
Posts: 3,053
justme300e, please provide some additional information about your vehicle. For instance: mileage, last time the engine had a tune-up, etc.
Fred Hoelzle
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Old 01-28-2015, 12:44 PM
oldtrucker's Avatar
BMW Mech (70's) Germany
Join Date: Jan 2014
Location: San Diego County
Posts: 131
Can't tell for sure, but it might be some temperature sensor issue.
distributor cap.
This engine doesn't have one.

Can you hear the external air injection pump running while cold?
This pump is injecting additional air while cold, to fake a lean condition so the e-gas is adjusting to richer.
Some other poster had a slipping belt, if so it could reduce the additional air injection.
Still, this is probably not the problem....
Have a look if the electrical clutch is engaged, only when cold.

There is a AIT (Air Intake Temperature Sensor) at the crossover duct on the driver side.
It's basically a Therrmistor that measurs the Air Intake Temperature!

Also, there is a engine coolant temperature sensor for the computer, at the thermostat housing, could be sending wrong values.

The MAS (Mass Air Sensor) would be another one, but if it was defective the engine would run all the time crappy.

Of course the is the fuel pump itself and related as TnBob already mentioned.

And, aaah ye olde code reader or this one should have an OBDII, this would give you a pretty good idea what is going on!

Mostly, I don't know notin, I just know where to look.
I am looking back, to over 30 years in Electronics Design.
Electrons don't care if they move in a car, computer or relay!

95 W124 E320 M104.992 - Because, I love to repair, naaaah!
Over 221,000 Miles
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