New spark plugs, misfires everywhere. OEM part#
Thread Starter
Junior Member
Joined: Jul 2017
Posts: 21
Likes: 0
GLK 350
New spark plugs, misfires everywhere. OEM part#
So i recently installed brand new plugs bosch YR7MPP33 which said they were OEM. I started up the car and i got misfires P0303, 0304, and 0306. Car felt like it was having a seizure. I turned off the car immediately and swapped to the old plugs and the car runs smooth. I checked the gaps to make sure they were .31 like the manual says. So I don't know whats going on. Do I need to disconnect the battery when replacing the plugs so the computer resets? Does anyone have the mercedes oem spark plug part number? I tried calling the dealer and they wont give out part numbers. Should I bother with the spark plugs from the dealer or are the ones i bought good enough? Sorry for the questions, I'm at an impasse with this car.
Member
Joined: Mar 2015
Posts: 239
Likes: 39
From: Vancouver
14 GLK 250
So i recently installed brand new plugs bosch YR7MPP33 which said they were OEM. I started up the car and i got misfires P0303, 0304, and 0306. Car felt like it was having a seizure. I turned off the car immediately and swapped to the old plugs and the car runs smooth. I checked the gaps to make sure they were .31 like the manual says. So I don't know whats going on. Do I need to disconnect the battery when replacing the plugs so the computer resets? Does anyone have the mercedes oem spark plug part number? I tried calling the dealer and they wont give out part numbers. Should I bother with the spark plugs from the dealer or are the ones i bought good enough? Sorry for the questions, I'm at an impasse with this car.
https://www.genuinemercedesparts.com...ber=0041598103
MBWorld Fanatic!
Joined: Sep 2015
Posts: 2,584
Likes: 343
2013 glk 350
I was going to do it myself, I found different numbers at different stores and online , it was to confusing, so I went to MB and got a set for my 2013, but now I’m not doing it I’ll let mb replace them. I have a set of MB plugs for a 276.957 motor for 2013 if you want them. Or go to MB and get what they say is correct. The premium price will be worth it.
