Mercedes-Benz Spark Plug Procedures and Precautions

by | Apr 2021 | 2 comments

This essential component was invented about 160 years ago, but is still evolving in terms of design, materials, and service.

Ah, the lowly humble spark plug. At one time it was king of the ignition system (or at least part of the royal court!). I...

Please log in below to view content.
Don't have a log in? Click here to register for free access.

Search All ATI Content:

Search by Publish Date

Related Features:

CO₂ as a Refrigerant is Happening

CO₂ as a Refrigerant is Happening

Under development for many years, R744 systems will be showing up soon. Are you ready? I know what many shop owners and technicians are thinking right now: When will it ever end, this constant changing of automotive air conditioning systems? Well the short answer is...

read more
NASTF and the VSP Registry

NASTF and the VSP Registry

Valuable resources for independent repair shops The National Automotive Service Task Force (NASTF) was created to provide a technology solution to ensuring access to the information needed to diagnose and repair every make and model vehicle. But if information is king...

read more
CO₂ as a Refrigerant is Happening

CO₂ as a Refrigerant is Happening

Under development for many years, R744 systems will be showing up soon. Are you ready? I know what many shop owners and technicians are thinking right now: When will it ever end, this constant changing of automotive air conditioning systems? Well the short answer is...

read more
NASTF and the VSP Registry

NASTF and the VSP Registry

Valuable resources for independent repair shops The National Automotive Service Task Force (NASTF) was created to provide a technology solution to ensuring access to the information needed to diagnose and repair every make and model vehicle. But if information is king...

read more

2 Comments

  1. twilighthan

    In the M157 engine, WIS does not state anything about the direction of the electrode gap. Also, for me it was impossible to see anything after I put the spark plug on to tell what direction it is in. Is there any best practices in spark plug installs for the M157 anyone knows of?

    • Automotive Tech Info

      The “Mercedes-Benz Spark Plug Indexing for Direct Injection Engines” Bulletin explains that on all direct injected MB engines (of which the M157 is), you should use only genuine MB spark plugs. To check your index put a mark on the porcelain in the direction of the electrode to see where it faces when installed. You may need a mirror to see it in its recess. We’ve added a button (above) to download the Spark Plug bulletin. We hope that helps.

Submit a Comment