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Old 11-17-2003, 04:32 AM
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Join Date: Mar 2001
Posts: 223
190e Coolant Temp Sensor - Cold Starting

How does the coolant temperature sensor effect cold starting?
How can it cause the engine to start hard when cold?
I have an 88 190e 2.3

1996 E320
2000 C230 Kompressor
1988 190e 2.3 - 225K miles, owned for 7 years. I cannot say enough good things about this car. Very well built, even at 225 it ran like new.
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Old 11-17-2003, 08:00 AM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
The coolant temp sensor tells the ECU how cold it is, so the ECU can richen up your fuel mixture accordingly.
This replaces the " choke " of yesteryear.
If the sensor does not function properly ( indicating a warm engine ) the fuel mixture would be lean.
Hope this helps.
2007 C 230 Sport.
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Old 07-11-2004, 11:40 AM
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Join Date: Oct 2003
Location: Ireland
Posts: 166
Rather than start a new thread I'll revive this one from the dead.

My euro 2.0 ltr has this type of sensor but black not green.

How do I measure if its working correctly? (I have starting issues and am looking to go through the system before replacing anything.)


1990 Euro 190e 2.0l Petrol Now Sold Maybe a w116 280se next
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Old 07-28-2004, 07:12 PM
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Join Date: Jul 2004
Location: anytown, USA
Posts: 95
Lightbulb Time for the resistence check...

Properly reset your handy ohm meter to zero;

Unplug the wire plug-ins on this coolant temp sensor...

On an unheated engine ohm resistence should read approximately 2,000 ohms...

After the engine is fully warmed up new resistence readings should be around 200 ohms...

Generaly speaking the over voltage protection OVP should be considered suspect/faulty before the coolant temp device...

Just trying to help thanks.
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Old 07-30-2004, 05:45 PM
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Join Date: Jul 2004
Location: Canada
Posts: 7
Machnumber2 i have the same problem, but mine is a 300e. i have been to 3 different (MB Specialist)mechanics but they couldnt solve my cold start problem. i spend thousands changing parts that didnt solved the problem(fuel filter,OVP, cold start relay, plugs & wires. fuel pump relay....etc. they even want to change my cat and fuel pump. so iwent to my mechanic for my van(which is not an MB specialist). he said all i need is a coolant temp. sensor. iam gonna get the parts tommorow so i'll let you know. coz i know i how frustrating it is spending money on uneccessary parts.
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Old 08-01-2004, 01:05 PM
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Join Date: Jul 2004
Location: Canada
Posts: 7
they just put my new coolant temperature sensor, no luck i thought that would fix my cold start problem. but it help the starting a bit now the most i have to crank it is twice. sometimes i just want to give up fixing it. ill do more research.

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