Slk 230 no start... - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 07-23-2015
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Slk 230 no start...

Ok i have seen a lot of posts here and followed them all but it does not fix my issue. I have a 98 slk230 sport... I turn the engine and the lights turn on, but the starter dosnt engage... I was told it was one of five things...

One: battery, battery tested good and no bad cells

Two: battery power relay, replaced with brand new

Three: starter, replaced starter with new one... During the test to see if this was the final step the starter made two rotations to try and engage the engine but then stopped... Ever since then we are back at step one...

Four: the k40 board... No burnt fuses and board looks brand new

Five: crank position sensor, replaced and same issues.....

I am now at a loss as to what the problem could be... All electronics work, but no engine.. I could use some assistance with this
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#2 Old 07-23-2015
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Try putting some cables on the battery to jump it, if it starts its the battery. One problem I had years ago was the K40, all looked good but investigating further with a magnifying glass I found several solder joints cracked.
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#3 Old 07-23-2015
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I'm guessing rotten battery cables. Emphasis on guess. A voltage drop measurement across the main cable would be helpful.
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#4 Old 07-24-2015
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I am not sure if yours is exactly the same as my 2002, but there is a control module for the starter in the engine bay fuse box. If you remove the cover surrounding the fuses, you will see it. The light purple wire with a white stripe is what you want to look for. Have someone stick it with a test light when you turn the key to start the car. If your test light illuminates, then you know it is trying to run the starter. This should at the very least help you isolate the issue. I would also check each and every fuse...doesn't hurt when you are stumped.
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#5 Old 07-28-2015
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Just curious, does your radiator fan come on when when you turn key and get no reaction from starter?
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#6 Old 07-31-2015
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Hi Swoop
Yes I've had that problem you described. My slk170 2003 will randomly not start although all warning lights come on and all electrics work fine. However the fan will come on. Any ideas?
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#7 Old 07-31-2015
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Tsquiz,

Swoop did not have the issue, Organoid the poster did

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#8 Old 07-31-2015
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The OP has not come back in a week, so assume ok, or s/he has lost the will to continue living…

As asked above, have you voltage going to the starter motor?

I cannot remember when the K40 was modified, but if you have an old one, I understand that they might look ok, but there were sometimes dry solder joints in there.

Are you sure the CPS was replaced with new?

There is another item that can fail that you do not have in your list - the ignition/start switch.

Have all codes been cleared?
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