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SLK-Class (R170) 1998-2003: SLK 200, SLK 230K, SLK 320

SLK/R170: "Lumpy" running...missing a cylinder?....sometimes ok....

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Old Apr 29, 2023 | 11:20 PM
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Billy22Bob
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From: Wollongong, sydney Australia
R170 99SLK230 + SLK32
"Lumpy" running...missing a cylinder?....sometimes ok....
99 SLK230 50,000mls
Problem started a couple of weeks ago.
Sometimes when I start it, it sounds/feels like its missing a cylinder.
Go to the shops - lack of power - like a cylinder is missing.
Another day....Turn on = ok...
Another day .....Lumpy again.... I turn it off and back on - this time its all good.
Faulty CPS?.....
TIA
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Old May 1, 2023 | 05:34 AM
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Fasterhorses
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From: San Diego, CA USA
2003 SLK230
Could be a failing coil. If it was my SLK230 I would replace all 4 coils.
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Old May 2, 2023 | 01:17 AM
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Billy22Bob
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From: Wollongong, sydney Australia
R170 99SLK230 + SLK32
ok - will do.
Whilst Im in there....
What are the best standard spark plugs for the 230?
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Old May 2, 2023 | 12:35 PM
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Fasterhorses
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From: San Diego, CA USA
2003 SLK230
BOSH FR7KTC or PLATINUM B4417.
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Old May 4, 2023 | 02:38 AM
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Billy22Bob
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From: Wollongong, sydney Australia
R170 99SLK230 + SLK32
thanx
what gap? - I'm running standard setup
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