im sure this has been discussed but im not getting a ton of info thats solved the problem. i changed my wife's spark plugs on her 2008 ml350. I used the bosch platinum ones.

i did not disconnect the negative battery terminal.

I did them one at a time on the driver side, then on the passenger side i took all three out, then put all three in.

i figured i had the intake hoses maybe not on perfectly. i have checked htem repeatedly and cant get the CEL to go off. is the engine cover sensitive to how you put it on? I notice some sort of vent in the middle up near the windshield.

i have a scanner on my diesel truck, so i will eventually hook it up, but this seems like it should be an easy fix. i know i maybe didnt do the steps 100% correctly (battery, order of plugs), but is that going to be a deal breaker?

let me know what you think. thanks

 

Bump

 

Please UPDATE YOUR PROFILE in USER CP. Indicate if gas or diesel.

 

Disconnecting the battery has nothing to do with changing spark plugs.

What misfire codes are you getting?

 

Sig added. Gas. Will check codes tonight when I get home.

If i installed them in the wrong order, is it as simple as redoing it? Or have I potentially done damage? I’ve never had issues with simple spark plug install. I did not gap them as I thought they came ready to go.

 

How could it be the wrong order. There's 3 on each side. Unless you got the wrong plugs. M/B 004 159 18 03.

 

I have read a million threads online and I see things about order and polarity, etc.

do you have a suggestion?

 

Codes are:

p0170 fuel trim malfunction bank 1
p0173 fuel trim malfunction bank 2
p2006 imrc stuck closed

thanks for any help you can give. Keep in mind she’s never had a code in the 7 years she has had this car, so I really doubt it’s a coincidence.

 

I did notice some small hose sort of left of center of the front engine cover was sort of hanging off. That can’t be good. Maybe a 3/4” diameter hose near the alternator. Oh well I cleared the codes and reconnected everything. We shall see tomorrow when she drives it. But if you guys have any bright ideas in the mean time please feel free to humble me.

 

Post these codes on the proper forum and stop posting on this forum.

https://mbworld.org/forums/m-class-w...plug-help.html

 

you seem like a really cool person. im sure it would be fun to have a beer with you.