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I will be doing the spark plugs on my own soon and getting different part numbers for my engine. I own a 2013 E350 Cabriolet which I think is chassis A207.
NGK and Autohausaz as well as some other less popular sites show part #: SILZKFR8D7S which has a long and straight coil connector but Mercedes is showing 004-159-81-03 which looks like your typical spark plug. Apparently what other sites are reporting is an interchangeable part with Mercedes' part.
Has anyone done their spark plugs on the A207 chassis and where did you end up getting the spark plugs from? Do you recall the correct part number?
Thanks for sharing the site. I went ahead and installed the part NGK was referencing and your site states "It may not fit". I do not have any misfires or check engine light. Both acceleration and fuel economy are up significantly. Not sure if I need to change the plugs to the correct ones.
Since I do not have any bad spark plug symptoms, my thoughts were to keep them in there until otherwise.
Worst case the electrode could be misaligned and result in spark erosion of a valve resulting in low compression, misfire and CEL.
Understood and thank you. I’ll keep an eye on it and update if I get any of those symptoms. After two 1 hour drives, the car drives amazingly better and hopefully it’ll stay that way.
Understood and thank you. I’ll keep an eye on it and update if I get any of those symptoms. After two 1 hour drives, the car drives amazingly better and hopefully it’ll stay that way.
Spark erosion isn't something that you will notice gradually, or be able to recover from. Spark erosion is physical wearing away (eroding) of the edge of the valve material, due to close proximity to the spark arc. It's irreversible and undetectable until it's an issue. It's something that occurs over time (thousands of miles).
The likelihood of spark erosion from misaligned electrodes is unknown. MB published a tech document on this, posted many times on this site. The search engine will find it. Best practice is to use OEM spark plugs from the dealer (pay the price) installed with the MB torque spec.
Spark erosion isn't something that you will notice gradually, or be able to recover from. Spark erosion is physical wearing away (eroding) of the edge of the valve material, due to close proximity to the spark arc. It's irreversible and undetectable until it's an issue. It's something that occurs over time (thousands of miles).
The likelihood of spark erosion from misaligned electrodes is unknown. MB published a tech document on this, posted many times on this site. The search engine will find it. Best practice is to use OEM spark plugs from the dealer (pay the price) installed with the MB torque spec.
OH WOW...I guess it's worse than I had originally thought. I'll order the proper ones today and install them later this week. Honestly, it was a fairly straightforward job. Only the cylinder closest to the driver gave me a hard time due to the lack of space. I have a torque wrench and properly torqued all the spark plugs, bolts, and screws.
My last question is, does anyone know who makes the spark plugs for MB? Are they made by NGK or Bosch?
11-27-2021, 08:44 AM
