engine cutting out and hard to start - Mercedes-Benz Forum
 
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post #1 of 8 (permalink) Old 05-11-2019, 05:07 PM Thread Starter
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engine cutting out and hard to start

Hello there, I'm a new comer to your forum and am hoping you can help me with my 2004 CLK320 that keeps cutting out. I purchased this vehicle a couple of months ago and apart from this one problem I am very happy with it.
For some reason it will cut out (the engine is warm) and refuses to start. It will crank over and over but not fire up. Some times it will start within 5mts. and other times 30mts. So it dose eventually start. The fuel tank has always had plenty of fuel and it wont start in either park or neutral. The vehicle has only travelled 97,000 klms and so has not done a lot of work.
I am concerned it will let me down while passing another vehicle and am reluctant to drive it now. It happened today at traffic lights and fortunately two guys pushed me to the side of the road. This is about the forth time it has happened so I realise I am having to do something drastic and no I donít need a match just yet.
Any help with regards to what might be the cause would be appreciated. Regards Colin
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post #2 of 8 (permalink) Old 05-12-2019, 07:19 PM
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Those are fairly typical symptoms of a failed CPS (crankshaft position sensor).

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post #3 of 8 (permalink) Old 05-12-2019, 09:50 PM
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As Rodney said ,,Cps is most likely the reason.
When they really fail they may run ok from a cold start ,but after 5 or 10mins when they heat up they stop working.
You need a new one ,,be sure to only use genuine Bosch or MB.
Fitting a new one is not very easy unless you have experience because access is very limited between the engine and the firewall.
The cps is a very common failure on these M112 and M113 engines once they get to 13 or more years old.

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post #4 of 8 (permalink) Old 05-13-2019, 05:55 AM Thread Starter
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Thank you Rudeney & Benzle for your advise it is most appreciated and I will look in to the CPS.
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post #5 of 8 (permalink) Old 05-13-2019, 07:20 PM
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One trick to try is pouring cold water over the CPS. Sometimes that might make it start working in a pinch.

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post #6 of 8 (permalink) Old 05-14-2019, 02:10 PM
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colbrit - welcome to the W209 forum.

You have CLK 320, model 209.365, engine type M112.955

If you look up the remove/install procedure in the WIS for this engine, the document is a tad misleading as it only shows the sensor location for the V8 engine. On your V6, sensor L5 is out of sight hidden under cables, etc. It is very difficult to access. (two of my Indies techs gave up and he had to do the job himself!)

Furthermore, the WIS refers to: a) initializing the CPS. b) performing sensor adaption.

I have no idea what this is all about. Maybe rudeney can shed some light on those WIS comments?
Attached Files
File Type: pdf W209 r - i crankshaft position sensor.pdf (648.9 KB, 4 views)
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post #7 of 8 (permalink) Old 05-14-2019, 08:41 PM
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There are some steps for CPS "teach in" that have you operate and drive the engine at certain RPMs. It does not require SDS or a diagnostic tool Honestly, I have heard of literally hundreds of people replacing the CPS without doing this and having no issues. I think that with normal driving, the CPS will basically "self-calibrate".

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post #8 of 8 (permalink) Old 05-15-2019, 07:21 PM
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there is a sticky that a brilliant genius wrote for V-8, might also be one for a 6
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