Cylinder 8 Misfire
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 21
Likes: 0
E55 w210
Cylinder 8 Misfire
Hello all,
As the title states, I'm having a misfire in cylinder 8. My indie shop diagnosed it and told me it could be the plug, wire or the coil. So I came to the conclusion that I will replace the plugs with Bosch 7422's and wires with Magnecor wires myself. My question is, where is cylinder 8 located? So I can replace the coil. I don't want to replace all coils because they cost about 130 each. If anybody has a diagram or point me where I can find one, it's much appreciated
Thanks in advance!
As the title states, I'm having a misfire in cylinder 8. My indie shop diagnosed it and told me it could be the plug, wire or the coil. So I came to the conclusion that I will replace the plugs with Bosch 7422's and wires with Magnecor wires myself. My question is, where is cylinder 8 located? So I can replace the coil. I don't want to replace all coils because they cost about 130 each. If anybody has a diagram or point me where I can find one, it's much appreciated
Thanks in advance!
Super Member
Joined: Dec 2009
Posts: 748
Likes: 93
From: Dhahran, KSA
2020 E 300 Coupe and 2019 GLS 400
-My advice is to stick with OE/Bosch wires, I had bad experience with Magnecor. The resistance is high, only worked for 6 months before starting to misfire like crazy and the mileage was all over the place.
-You can diagnose the problem it's fairly easy, just move the coil to another cylinder. If the misfire moves to the other cylinder you know it's defective.
-How are the valve covers? a leaking cover could let oil foul the spark plugs.
You can see cylinder numbers on the engine, 1-4 passenger side, 5-8 driver side. 4 & 8 are closest to firewall.
Good luck.
-You can diagnose the problem it's fairly easy, just move the coil to another cylinder. If the misfire moves to the other cylinder you know it's defective.
-How are the valve covers? a leaking cover could let oil foul the spark plugs.
You can see cylinder numbers on the engine, 1-4 passenger side, 5-8 driver side. 4 & 8 are closest to firewall.
Good luck.
Last edited by Solo wing; Feb 23, 2016 at 04:49 PM.
MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
Likes: 398
From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
i had & have Magnecor wires with all current & previous "C280/C43/E55/C43-with 5.4l",,
i don't have any issue with them, they works great..!
ZAYED,,
Member
Joined: Oct 2014
Posts: 107
Likes: 3
From: Houston area, TX
2001 E-55 AMG
I got the code for misfire on #8, cylinder closet to driver. Sometime when I came to a stop the car would idle rough. Yesterday I swapped the coil pack between 7 & 8, cleared the code and went a for an 80 mile spirited drive. So far no codes and is running great.
Try swapping coils and see what happens.
Try swapping coils and see what happens.
Thread Starter
Junior Member
Joined: Sep 2015
Posts: 21
Likes: 0
E55 w210
Solowing- I will check the plugs for any oil asap. And as far as the magnecors go, did they throw any codes eventually? What exactly was faulty?
Zayed- thanks for your input. It definitely helps a lot to know the magnecors hold up as well as oem.
Wasp- I'll swap out the coils as soon as I get a chance. Did that clear your check engine light?
One more question, what is the correct gap for the plugs? 7422's come pre-gapped, I just want to double check
Zayed- thanks for your input. It definitely helps a lot to know the magnecors hold up as well as oem.
Wasp- I'll swap out the coils as soon as I get a chance. Did that clear your check engine light?
One more question, what is the correct gap for the plugs? 7422's come pre-gapped, I just want to double check
Member
Joined: Oct 2014
Posts: 107
Likes: 3
From: Houston area, TX
2001 E-55 AMG
Super Member
Joined: Dec 2009
Posts: 748
Likes: 93
From: Dhahran, KSA
2020 E 300 Coupe and 2019 GLS 400
No codes, No CEL As soon as I installed Bosch wires all of that went away.
I think Bosch platinum comes pre-gapped? Check in the owners manual just in case.
