M112 misfire - Mercedes Benz SLK Forum

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

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#1 Old 04-03-2019
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M112 misfire

hi guys,

Advice needed please, I have a mis fire on my r170 slk 320 on cylinder 6
I’ve changed the spark plugs and checked leads and swapped injectors which still hasn’t cured the problem? Any ideas?
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#2 Old 04-03-2019
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Got codes?
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#3 Old 04-03-2019
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Yes, p2054 & p2050
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#4 Old 04-03-2019
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misfires usually 4 things

sparkplugs
ignition wires
coil
injector

did u check/swap coils?
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#5 Old 04-03-2019
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Yes, changed plugs, all check ok?
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#6 Old 04-03-2019
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The car will run perfect below 4000rpm once reset, only happens under hard acceleration
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#7 Old 04-03-2019
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clogged catalytic converter?
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#8 Old 04-03-2019
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How do you check that?
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Quote:
Originally Posted by Hr170 View Post
How do you check that?
remove the O2 sensors before the cats and see if it runs better. will be a little louder, but it's just a test.
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#10 Old 04-03-2019
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Hey just curious, do folks ‘gut the cats’ on these cars? No, I am not condoning or suggesting it just wondering.
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#11 Old 04-03-2019
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Originally Posted by Roxanne7169 View Post
Hey just curious, do folks ‘gut the cats’ on these cars? No, I am not condoning or suggesting it just wondering.
I have. but my car is far from stock and does not require them.... And neither does the state of Kansas.
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#12 Old 04-03-2019
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Quote:
Originally Posted by Hr170 View Post
Yes, p2054 & p2050
Google is pointing both of those codes towards a reductant injector. Did you clear the codes after you installed the new injectors?
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#13 Old 04-03-2019
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Is there a reliable fault code list somewhere as I keep seeing different answers re p2054
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#14 Old 04-03-2019
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Quote:
Originally Posted by Hr170 View Post
Is there a reliable fault code list somewhere as I keep seeing different answers re p2054
In corroboration of post 12
https://www.obd-codes.com/p2054

I find the trouble with P codes is that they are somewhat generic in nature and not an MB specific code. Hence your query.


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#15 Old 04-03-2019
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That refers to diesel fuel??
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#16 Old 04-03-2019
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Quote:
Originally Posted by Hr170 View Post
Is there a reliable fault code list somewhere as I keep seeing different answers re p2054
Try this one, but I've got a feeling that you might be off to pay MB a visit for a proper scan.
Attached Files
File Type: pdf Mercedes-Benz Fault Code List.pdf (108.0 KB, 11 views)
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#17 Old 04-03-2019
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And they're pointing towards the CAT as per @Turdo2 suggestion
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#18 Old 04-03-2019
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Quote:
Originally Posted by Hr170 View Post
Is there a reliable fault code list somewhere as I keep seeing different answers re p2054
I can look in DAS later today, unless someone beats me to it (highly encouraged).
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Quote:
Originally Posted by Hr170 View Post
That refers to diesel fuel??
Ahh, so you noticed That's what I was trying to (subtly) illustrate about diagnosing generic P-codes.


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