High RPM Misfire Solved!!!
Thread Starter
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Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
High RPM Misfire Solved!!!
OK, many of you know that I have been dealing with high RPM misfires for about a month now.
I have spent hours upon hours fighting with my car trying to figure out the issue.
I thought / said it was the cats from day one, but we checked all of the obvious stuff first.
Needless to say.......
I was RIGHT!!!
Car runs perfect again.....even though my cats are now gutted and a simulator is in their place.
Enjoy the pics!!
Big thanks to Fluid Motor Union (LET Partner) for helping me with countless hours of work. I really trust OJ & Lucci and value their work and opinions. I really hope that LET can bring them much business in the future!
If you're in the west burbs and need to have quality work done, call Fluid Motor Union. They are moving into a new shop as we speak with a brand new Dyno Dynamics dyno, customer cafe area with an internet workstation, wireless, big screen, etc.
The old shops address is:
Fluid MotorUnion
10119 South Mandel
Plainfield, IL 60585
Phone: (630) 946-0166
We now have 2 partner locations in Chicago to better serve you!
I have spent hours upon hours fighting with my car trying to figure out the issue.
I thought / said it was the cats from day one, but we checked all of the obvious stuff first.
Needless to say.......
I was RIGHT!!!
Car runs perfect again.....even though my cats are now gutted and a simulator is in their place.
Enjoy the pics!!
Big thanks to Fluid Motor Union (LET Partner) for helping me with countless hours of work. I really trust OJ & Lucci and value their work and opinions. I really hope that LET can bring them much business in the future!
If you're in the west burbs and need to have quality work done, call Fluid Motor Union. They are moving into a new shop as we speak with a brand new Dyno Dynamics dyno, customer cafe area with an internet workstation, wireless, big screen, etc.
The old shops address is:
Fluid MotorUnion
10119 South Mandel
Plainfield, IL 60585
Phone: (630) 946-0166
We now have 2 partner locations in Chicago to better serve you!
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Joined: Jul 2007
Posts: 5,459
Likes: 152
From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati
Eurocharged Performance ML63 and TT lambo
OK, many of you know that I have been dealing with high RPM misfires for about a month now.
I have spent hours upon hours fighting with my car trying to figure out the issue.
I thought / said it was the cats from day one, but we checked all of the obvious stuff first.
Needless to say.......
I was RIGHT!!!
Car runs perfect again.....even though my cats are now gutted and a simulator is in their place.
Enjoy the pics!!
Big thanks to Fluid Motor Union (LET Partner) for helping me with countless hours of work. I really trust OJ & Lucci and value their work and opinions. I really hope that LET can bring them much business in the future!
If you're in the west burbs and need to have quality work done, call Fluid Motor Union. They are moving into a new shop as we speak with a brand new Dyno Dynamics dyno, customer cafe area with an internet workstation, wireless, big screen, etc.
The old shops address is:
Fluid MotorUnion
10119 South Mandel
Plainfield, IL 60585
Phone: (630) 946-0166
We now have 2 partner locations in Chicago to better serve you!
I have spent hours upon hours fighting with my car trying to figure out the issue.
I thought / said it was the cats from day one, but we checked all of the obvious stuff first.
Needless to say.......
I was RIGHT!!!
Car runs perfect again.....even though my cats are now gutted and a simulator is in their place.
Enjoy the pics!!
Big thanks to Fluid Motor Union (LET Partner) for helping me with countless hours of work. I really trust OJ & Lucci and value their work and opinions. I really hope that LET can bring them much business in the future!
If you're in the west burbs and need to have quality work done, call Fluid Motor Union. They are moving into a new shop as we speak with a brand new Dyno Dynamics dyno, customer cafe area with an internet workstation, wireless, big screen, etc.
The old shops address is:
Fluid MotorUnion
10119 South Mandel
Plainfield, IL 60585
Phone: (630) 946-0166
We now have 2 partner locations in Chicago to better serve you!
How in the world was the car even running???????
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Thread Starter
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Joined: Aug 2006
Posts: 4,909
Likes: 130
From: Houston
C63S
Originally Posted by ///amg4ever
I'm glad your car is back to normal Jerry. Can you explain the symptons of what happened?
The issue was caused because a catch can full of oil that wasn't monitored correctly and the vaccum lines sucked that oil back into the intake which made its way to the cats.
Does the car drive fine until a specific RPM?
Can you provide more info?
Thread Starter
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Posts: 4,909
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From: Houston
C63S
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Joined: May 2007
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From: Oakland, California
07 E550, 02 C32, 91 300E
The car drove perfectly until I hit 4800 RPM's, then it would do a random cylinder misfire.
The issue was caused because a catch can full of oil that wasn't monitored correctly and the vaccum lines sucked that oil back into the intake which made its way to the cats.
Well, is it missing at random or is a the same cylinders over and over?
Does the car drive fine until a specific RPM?
Can you provide more info?
The issue was caused because a catch can full of oil that wasn't monitored correctly and the vaccum lines sucked that oil back into the intake which made its way to the cats.
Well, is it missing at random or is a the same cylinders over and over?
Does the car drive fine until a specific RPM?
Can you provide more info?
Thread Starter
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Joined: Aug 2006
Posts: 4,909
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From: Houston
C63S
It has to be from it filling up...I installed my catch can last year and have emptied it many of times.
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From: Houston
C63S
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CLS55 Designo 030
Thank you Jerry, you have made my day. I checked a few things with Erick and Sunil but we couldn't nail it down. My car has 110K miles and this is my first CEL.
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From: Oakland, California
07 E550, 02 C32, 91 300E
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From: Portsmouth, NH
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Does your car use 4 cats like other MB's and if so are you still running all 4? Also, what do mean by "cat simulator"?
If the PCV gunk made it all the way to mess up the cats I'm sure your top end could use a cleaning also. Just a thought.
If the PCV gunk made it all the way to mess up the cats I'm sure your top end could use a cleaning also. Just a thought.
now she ready for the track again on July 19th.
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From: Houston
C63S
Great! That's exactly what is happening to my car. So, how do I tell between a bad and a good cat? Any available upgrades besides the OEM ones?
Thank you Jerry, you have made my day. I checked a few things with Erick and Sunil but we couldn't nail it down. My car has 110K miles and this is my first CEL.
Thank you Jerry, you have made my day. I checked a few things with Erick and Sunil but we couldn't nail it down. My car has 110K miles and this is my first CEL.
The only way to tell would be to take a look inside.....they drilled a small hole in front of mine and used a borescope to take a peek.
http://www.renntechc32.com/oil/
I'll find out what they put inside and I'll let you know.
We did replace the Supercharger and Intercooler. We also cleaned the intake ports and checked everything out.
I hope so...will let you know!
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From: South Jersey
2002 C32 AMG
Jerry, it's me again
We exchanged PM's about 8 times last week while you helped me diagnose the same problem. I didn't realize you were having the problem too. That is EXACTLY what my cats looked like.
I pulled the exhaust pipes off when you mentioned a possible exhaust restriction. It looks like you have (had) the metal substrate cats as well. I guess these don't work on our cars with the high heat and exhaust pressures. Back to ceramic maybe?
Thanks again for helping me diagnose!
We exchanged PM's about 8 times last week while you helped me diagnose the same problem. I didn't realize you were having the problem too. That is EXACTLY what my cats looked like. I pulled the exhaust pipes off when you mentioned a possible exhaust restriction. It looks like you have (had) the metal substrate cats as well. I guess these don't work on our cars with the high heat and exhaust pressures. Back to ceramic maybe?Thanks again for helping me diagnose!
Thread Starter
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Joined: Aug 2006
Posts: 4,909
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From: Houston
C63S
Jerry, it's me again We exchanged PM's about 8 times last week while you helped me diagnose the same problem. I didn't realize you were having the problem too. That is EXACTLY what my cats looked like. I pulled the exhaust pipes off when you mentioned a possible exhaust restriction. It looks like you have (had) the metal substrate cats as well. I guess these don't work on our cars with the high heat and exhaust pressures. Back to ceramic maybe?
Thanks again for helping me diagnose!
We exchanged PM's about 8 times last week while you helped me diagnose the same problem. I didn't realize you were having the problem too. That is EXACTLY what my cats looked like. I pulled the exhaust pipes off when you mentioned a possible exhaust restriction. It looks like you have (had) the metal substrate cats as well. I guess these don't work on our cars with the high heat and exhaust pressures. Back to ceramic maybe?Thanks again for helping me diagnose!
No problem! Not sure what I'm going to do now...
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From: Philadelphia, PA
2008 A8L, 2002 996TT X50, 2009 X5
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CLS55 Designo 030
Have you replaced your MAP sensor before? That's the first thing that comes to mind.
