Slk 230k bad idle when hot - Mercedes Benz SLK Forum

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#1 Old 07-14-2015
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Slk 230k bad idle when hot

Hello!
I have problem with my 1999 slk. She starts shaking on idle when get hot.
Already change: Maf, coils, wires and crankshaft sensor.
Cooling fun don't work neather, i have made some modification to get fun running manually.
Any hints?
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#2 Old 07-14-2015
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Originally Posted by jone View Post
Hello!
I have problem with my 1999 slk. She starts shaking on idle when get hot.
Already change: Maf, coils, wires and crankshaft sensor.
Cooling fun don't work neather, i have made some modification to get fun running manually.
Any hints?
Have you checked for cold solder joints on your K40 relay?
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#3 Old 07-14-2015
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Yes, left upper corner solder joints is already fixed, but somebody has done bad work, could K40 make some idle problem also?
Star shows no codes.
Performance is ok.
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#4 Old 07-14-2015
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Originally Posted by jone View Post
Yes, left upper corner solder joints is already fixed, but somebody has done bad work, could K40 make some idle problem also?
Star shows no codes.
Performance is ok.
If somebody did bad work, fix it or replace it.

I think the K40 can cause an idle issue and a fan issue.

https://www.slkworld.com/320484-post127.html
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