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Replaced the battery on my 2001 SLK and cleared the ESP light. Short test drive found misfire present. EPA rules require that catalyst damaging misfire must cause the Check Engine Lamp (CEL) to flash - alerting driver to correct misfire before catalyst is damaged by overheating. I do not have a flashing CEL with this misfire.

Is there a drive schedule that will cause the controller to run the misfire diagnostic and correct a possible spark advance issue?
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
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I believe the misfire monitor runs constantly, so there's no need to wait for a drive cycle to complete.

You're right about the flashing -- but that generally doesn't happen unless the misfire is chronic. You'd probably notice reduced performance in that case. Are you noticing any?

Have you cleared the code to see if it returns?
 
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