CEL after Kleemann flash and headers - Mercedes Benz SLK Forum

Performance MODS for the R171 Tuning and Performance modifications for your SLK

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#1 Old 07-31-2015
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CEL after Kleemann flash and headers

This afternoon I picked up my newly Kleemanned '05 slk 350. Needless to say, car sounded amazing and had some extra oomph. However, a moment ago I started the car and the CEL was on. The car seems to idle roughly sometimes but not always. Also has a bit of clunking in the front when it idles roughly. Engine and tranny mounts are basically new. I will go check the code tomorrow, just curious if anyone has any insight because I'm a bit worried that this CEL is on.
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#2 Old 07-31-2015
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who did the flash?
mine was done by Kleemann, so no cel from tune/headers.
was cel present when you picked up car from mechanic?
O2 sensors fell out of down pipes (see my pics)?



have you added fuel recently? loose gas cap or dried seals around cap cause cels
rough idling? see the techron thread
https://www.slkworld.com/general-disc...-tier-gas.html


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Last edited by jbanks15; 08-02-2015 at 08:41 AM.
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#3 Old 08-02-2015
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hmmm just a thought as i have an slk350 as well with the same headers.. whilst doing my tune my harmonic balancer failed ,which may lead to a rough idle and send of CEL .
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#4 Old 08-02-2015
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Jeff, yes the flash was done by Kleemann. Got the code checked yesterday. Turns out it was my intake manifold flap, which had already been sticking for several months but had never caused a CEL. I guess the tune prompted the computer to start caring about it.
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#5 Old 08-02-2015
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Pezonator, interesting about the harmonic balancer issue, I'll have to take a look at that.
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#6 Old 08-02-2015
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Hi All


A question about this mod , Are the front two Cats the same rating as the rear two Cats or is its like a master Cat & a secondary Cat , If the same ratings its does not matter which ones are removed the results coming out the tail pipes will be the same from a gases points of view.


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#7 Old 08-02-2015
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I know they are called primary and secondary


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#8 Old 08-02-2015
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Hi All


@ JB But is this just by name & not by how many work they do ??
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#9 Old 08-02-2015
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Don't know that my friend, but I know my primary are gone
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#10 Old 08-02-2015
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Not sure, I just drive the thing haha.
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