MISFIRE CYLINDER 5 . PLEASE HELP ME
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
car fixed. my dealer was tryin to get me to change my intake and bill roughly 3300 for other****. took my diag back to my mechanic and showed him. used one more trick to clean my fuel rail and valves and injec. we used bg 44k can for 25 dollars and drove it then drove it very hard and redline it too and car is back to normal. no more prob. thank u guys
MBWorld Fanatic!
Joined: Apr 2005
Posts: 1,775
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From: Los Angeles
CLK W208
I told you brother, once we hear missfire, we automatically assume its electrical related but in our cars 80% of the time its not. The carbon build up is what gets most of the MBs my car and my mom's had the same issue, but sometimes you have to use very strong solvants. here is another tip, take your EGR valve and it's tube that goes to the throtthle body out and clean it with the same solvant and you will see a huge difference it pickup and overall performance of the car. its an easy job and can be done in about 3 hours. get some solvant and a metal coat hanger(coat hanger needed to clean the pipe. 
Super Member
Joined: Feb 2008
Posts: 618
Likes: 3
From: orlando
Sold 2003 CLK 500,2003 SL 500,2006 Acura MDX,1998 BMW M3 convertible
Good I am happy to hear that your car is fixed big mike !! I hope you always used premium fuel before and after ..dont be cheap using lower octane fuel cause it cheap !! That why mb cars required premium fuel only !!! To clean out carbon deposits.Once in a while I use either techron ,or lucas or even mystery oil fuel treatment to clean out injectors,valves ,etc !!!
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
Good I am happy to hear that your car is fixed big mike !! I hope you always used premium fuel before and after ..dont be cheap using lower octane fuel cause it cheap !! That why mb cars required premium fuel only !!! To clean out carbon deposits.Once in a while I use either techron ,or lucas or even mystery oil fuel treatment to clean out injectors,valves ,etc !!!
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
next time i get my oil done, he wants to use the MOA bg into my engine to clean it up and im set .
Senior Member
Joined: Apr 2008
Posts: 274
Likes: 0
From: Oakland, CA
2011 C63
thanks, gonna run that through my car too, i'm getting some rough idle and have just about replaced everything...
i've put in seafoam and multiple techron...hopefully bg44k is stronger...
i've put in seafoam and multiple techron...hopefully bg44k is stronger...
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
they drained my tank and changed the fuel filter and filled the car with new gas and a bottle of bg4k. even when i went to auto zone, the workers told me , bg44k is the strongest out there and they did not carry it.
keep us updated.
Are u having the same prob?
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Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
Senior Member
Joined: Apr 2008
Posts: 274
Likes: 0
From: Oakland, CA
2011 C63
similar, idle feels like an old school muscle car...came a long way from rough idle, replaced o2 sensors, spark plugs, spark plug wires, valve cover gaskets, air filters, maf sensor, and etc...
no CEL ever, adaptation values were all over the place, checked gas through fuel line after replacing fuel filter, and everything flowing fine....
really frustrating as this is much better than before but still never solved the issue. Went to 3 dealerships and couple indy's....nobody could figure anything out except throwing parts at it or says its "old" get a newer car....
one dealership kept blaming it on me deleting the secondary cats/resonator and adding magnaflow muffler...said it changed the pulse wave thus the engine shivers...doh!
no CEL ever, adaptation values were all over the place, checked gas through fuel line after replacing fuel filter, and everything flowing fine....
really frustrating as this is much better than before but still never solved the issue. Went to 3 dealerships and couple indy's....nobody could figure anything out except throwing parts at it or says its "old" get a newer car....
one dealership kept blaming it on me deleting the secondary cats/resonator and adding magnaflow muffler...said it changed the pulse wave thus the engine shivers...doh!
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
similar, idle feels like an old school muscle car...came a long way from rough idle, replaced o2 sensors, spark plugs, spark plug wires, valve cover gaskets, air filters, maf sensor, and etc...
no CEL ever, adaptation values were all over the place, checked gas through fuel line after replacing fuel filter, and everything flowing fine....
really frustrating as this is much better than before but still never solved the issue. Went to 3 dealerships and couple indy's....nobody could figure anything out except throwing parts at it or says its "old" get a newer car....
one dealership kept blaming it on me deleting the secondary cats/resonator and adding magnaflow muffler...said it changed the pulse wave thus the engine shivers...doh!
no CEL ever, adaptation values were all over the place, checked gas through fuel line after replacing fuel filter, and everything flowing fine....
really frustrating as this is much better than before but still never solved the issue. Went to 3 dealerships and couple indy's....nobody could figure anything out except throwing parts at it or says its "old" get a newer car....
one dealership kept blaming it on me deleting the secondary cats/resonator and adding magnaflow muffler...said it changed the pulse wave thus the engine shivers...doh!
NOW my shop did every possible test that u can think off and even checked for vaccum leak and MAF and CPS sensor and compression of my cylinder and fuel and fire and pressure of my fuel rail as well and all came back fine.
one thing i have learned even though my car passed every test, they could not tell if the line are FULLY clogged or not even though the pressure was in normal range.(which will tell me its not clogged)
One can of bg44k and My car is back to life.
it idle normally and does not shake at all.
i hope u can get it fixed
ps: make sure that u got new fuel filter. its only 70 dollars or so.
Senior Member
Joined: Apr 2008
Posts: 274
Likes: 0
From: Oakland, CA
2011 C63
thanks for the advice...i'll do the bg44k first throught the tank...if it doesn't work, looks like rail cleaning for the fuel injectors...the mechs all think i'm chasing a ghost..."its suppose to idle like this" or "this is a hot rod"...
i do have 110k miles on the car and no issues until last couple thousand miles...just doing preventative maintenance and came across this fiasco...issue is it is very intermittent...wish i had a CEL to tell me at least where to look....also did the fuel filter couple thousand miles ago too...
never had a CEL on this car...had the mech check to make sure the bulb wasn't out....other than that, this thing has been more reliable than any cars i've ever had...that includes honda/toyota/nissans....
i do have 110k miles on the car and no issues until last couple thousand miles...just doing preventative maintenance and came across this fiasco...issue is it is very intermittent...wish i had a CEL to tell me at least where to look....also did the fuel filter couple thousand miles ago too...
never had a CEL on this car...had the mech check to make sure the bulb wasn't out....other than that, this thing has been more reliable than any cars i've ever had...that includes honda/toyota/nissans....
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
you are to welcome. my car has 118000 now and that was my first prob ever in 5 years. but let me tell u something about removing cats. car ll not idel the same. it ll be lil rougher. i tell u this from my previous car and removed my cats. its not gonna be smooth. u ll feel some vibration too. trust me u don't wanna have cel on. u are fine im pretty sure unless your car is hesitating a lot and feels like its gettin choked then its a prob. good luck.
Senior Member
Joined: Apr 2008
Posts: 274
Likes: 0
From: Oakland, CA
2011 C63
primary cats are still on, just deleted the secondary cats...it was rattling...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
Thread Starter
MBWorld Fanatic!
Joined: Feb 2007
Posts: 1,348
Likes: 2
From: Northern VA / DC
CLK 320 (2001) and 2015 GTR
primary cats are still on, just deleted the secondary cats...it was rattling...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
i hope u dont have a prob either
Super Member
Joined: Feb 2003
Posts: 523
Likes: 1
From: Hollywood North
CLK 55 ///AMG Cabrio, ML63 ///AMG
Hi, so did you have the issue fixed? Please update us. Thanks.
primary cats are still on, just deleted the secondary cats...it was rattling...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
Junior Member
Joined: May 2016
Posts: 31
Likes: 0
2000 CLK 320
primary cats are still on, just deleted the secondary cats...it was rattling...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
sometimes there are hesitations, like its choking on something...
but i've got to say though, after removing the secondary cats/resonator and adding the magnaflow muffler, it felt more responsive....feel like the air is forcing its way out...less restrictions...
Junior Member
Joined: Sep 2011
Posts: 51
Likes: 0
From: Winchester VA, USA
wdbjf55fxtj020203
Very easy fix
Dear sir
your problem is very simple and easy to repair
please replace your ignition coils , you can buy the cheap ones from EBay for like $120 all 6 pieces,, if you want to go for the expensive ones buy from the dealer $120 each)
i had this problem and fresh set of plugs and 6 new coils and the car back like new , the scanner was giving me random misfire which was crazy
try this and let me know,, it is about one hour labor if you do not know how to do it yourself
good luck
your problem is very simple and easy to repair
please replace your ignition coils , you can buy the cheap ones from EBay for like $120 all 6 pieces,, if you want to go for the expensive ones buy from the dealer $120 each)
i had this problem and fresh set of plugs and 6 new coils and the car back like new , the scanner was giving me random misfire which was crazy
try this and let me know,, it is about one hour labor if you do not know how to do it yourself
good luck
