croatjj

Hello,

I have the plugs and wires already picked out that I want to replace however I am uncertain on the ignition coils. My ML320 has 88k right now and I am planning on a 100k tuneup and the plugs and wires were going to be done as I have a high speculation that they are OEM from 2002 when the car was built.

I am seeing conflicting info as far as the ignition coil however, any suggestions as to if these should be replaced or not? On newer cars like our new Jeep the ignition coils are never to be replaced unless they fail. I am finding these coils for the Benz for $25 all over the place and conflicting stories on replacing them, any insight?

Also since on the topic, any other 100k maintenance that should be done at the same time?

Thanks!

Plutoe

To correctly identify the parts for your car post the VIN!!

croatjj

I'm not looking to identify a specific part, I am asking about best practices in regards to changing out the ignition coils (all 6) at 100k miles.

Anyways - anyone know the recommended interval for changing out the ignition coils?

Maj. Dundee

First of all these coils are very expensive and if you are planning on buying $25 ones, you are buying crap.

These double ignition coils rarely fail, and when I say rarely, it's almost unheard of. Save your money as there is no replacement interval.

croatjj

Well they range in price, there are about a dozen brands in the $25-30 range per coil. OEM Bosch and the likes are about $40-50 each so even getting the OEM spec is not a ton of money in comparison and hardly that "expensive".

Is there any reference point aside from your statement that they "never" fail? For example in the service manual for the new Jeep it states that the ignition system is integrated into the CANBUS and there is no replacement interval as it should last the life of the vehicle.

Thanks

Maj. Dundee

Why are you referencing Jeep?

croatjj

I said "for example" and I was referencing a new vehicle I purchased which references the ignition coil. I know of other car makes that also do not suggest servicing the coil packs either however as I've found out this past year the Benz follows some things differently than other vehicles. Last year I bought this used Benz and a new Jeep - I am familiar with servicing the Jeep in every way however there have been a few surprises so far with the Benz. Just like the plugs and wires on the Benz, never would have imagined having a separate coil pack per cylinder nor 2 wires/plugs per cylinder as well.