Secondary Cats and Resonator delete DID SOMETHING BAD....seemingly
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
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From: Toronto
C63 Coupe
Secondary Cats and Resonator delete DID SOMETHING BAD....seemingly
Like I said, SEEMINGLY, after the res and 2nd cat cut and replace with a stainless X pipe and tubes its loud...ya, that's the good part.
and it never did the bad part before this cut and replace...
The BAD part is, hot or cold, driven hard or soft...completely at random for no reason I can think of it intermittently doesn't have half of the snappy rev it can and should at all times, when being revved in idle.
Other times, it does. It snappily revs and sounds like a beast on fire.
But, it completely unpredictably doesn't at times...Its almost as if it just simply doesn't respond for a second or two to punching the gas pedal...or it simply hesitates and then climbs the revs really slowly and weakly.
The needle jumps a millimeter or so up and down and you can feel the car shake a little from time to time as well...
What I can do however is rev the snot out of it, till it seemingly realizes its a C63 and then gets back to its normal snappy revs like we all love.
What in the ...?
No other mods, no chips, no filters, nothing...
30k kms on it...oil changed 4k ago...NO CEL, no other issues.
Thoughts?
and it never did the bad part before this cut and replace...
The BAD part is, hot or cold, driven hard or soft...completely at random for no reason I can think of it intermittently doesn't have half of the snappy rev it can and should at all times, when being revved in idle.
Other times, it does. It snappily revs and sounds like a beast on fire.
But, it completely unpredictably doesn't at times...Its almost as if it just simply doesn't respond for a second or two to punching the gas pedal...or it simply hesitates and then climbs the revs really slowly and weakly.
The needle jumps a millimeter or so up and down and you can feel the car shake a little from time to time as well...
What I can do however is rev the snot out of it, till it seemingly realizes its a C63 and then gets back to its normal snappy revs like we all love.
What in the ...?
No other mods, no chips, no filters, nothing...
30k kms on it...oil changed 4k ago...NO CEL, no other issues.
Thoughts?
MBWorld Fanatic!
Joined: Nov 2014
Posts: 2,575
Likes: 407
From: Olathe, KS
'13 C63 AMG P31
Could it be a leak? You could always take it back to the shop and ask them to run through it to makes sure everything is sealed up.
Also reset your ECU.
The procedure to reset the ECU is as follows:
1. Turn the ignition key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tires.
The ECU reset procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.
Read more: Easiest way to reset my ECU
Also reset your ECU.
The procedure to reset the ECU is as follows:
1. Turn the ignition key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tires.
The ECU reset procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.
Read more: Easiest way to reset my ECU
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
Likes: 0
From: Toronto
C63 Coupe
Could it be a leak? You could always take it back to the shop and ask them to run through it to makes sure everything is sealed up.
Also reset your ECU.
The procedure to reset the ECU is as follows:
1. Turn the ignition key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tires.
The ECU reset procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.
Read more: Easiest way to reset my ECU
Also reset your ECU.
The procedure to reset the ECU is as follows:
1. Turn the ignition key to the "on" position which is just before you crank the engine to start.
2. Press the accelerator to the floor and hold for 5 seconds.
3. Then turn the key to the off position but do not remove the key, then release the accelerator.
4. Wait at least 2 minutes, the ECU is then reset.
5. ECU is now reset and you are ready to get new rear tires.
The ECU reset procedure only erases the adaptive transmission and throttle settings. It does not erase any of the fuel, timing or other programming.
Read more: Easiest way to reset my ECU
I figured the same thing. I was thinking it seems like the car is having a hard time matching the fuel to the air if the pipes are hot and swelled and sealed or cold and sealed or vice versa... but then again, its very random and hot or cold so I'm stumped.
I think ill try the ecu reset...problem is I have keyless push start button...
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
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From: Toronto
C63 Coupe
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
Likes: 0
From: Toronto
C63 Coupe
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Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
Likes: 0
From: Toronto
C63 Coupe
well that was interesting...
I reset it twice to be sure.
Revved it, change...still soft baby lamb revs...
Then ripped it tim hortons and its definitely faster...snappier, arrogant and reminded me of why I bought this car in the first place...it put that smile back on my face.
Then while in the drive thru line for coffee, considering a chocolate glazed tim bit to match the one now fresh in my shorts, I revved it again, hoping for the anger...
and got baby lamb again...
pissed I didn't get the tim bit but got the coffee and ripped it away...again, reminding me of the power of the C63's....
thinkin to myself maybe its just me..maybe its just my ears...maybe I'm not as intuitive to my cars sounds and blips and gurgles as I'd like to think I am...I parked it.
Then revved it again and it snapped at me like I remembered...exactly like... vindicating that I DO in fact know my car/cars and this is an issue...
but still left me at square one...post one...same issue...sigh
what in the hell is going on here gentlemen....
I reset it twice to be sure.
Revved it, change...still soft baby lamb revs...
Then ripped it tim hortons and its definitely faster...snappier, arrogant and reminded me of why I bought this car in the first place...it put that smile back on my face.
Then while in the drive thru line for coffee, considering a chocolate glazed tim bit to match the one now fresh in my shorts, I revved it again, hoping for the anger...
and got baby lamb again...
pissed I didn't get the tim bit but got the coffee and ripped it away...again, reminding me of the power of the C63's....
thinkin to myself maybe its just me..maybe its just my ears...maybe I'm not as intuitive to my cars sounds and blips and gurgles as I'd like to think I am...I parked it.
Then revved it again and it snapped at me like I remembered...exactly like... vindicating that I DO in fact know my car/cars and this is an issue...
but still left me at square one...post one...same issue...sigh
what in the hell is going on here gentlemen....
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
Likes: 0
From: Toronto
C63 Coupe
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
Likes: 0
From: Toronto
C63 Coupe
and here I thought I WAS the only one...
LOL
We do...and then shaddapp all the people who've said...I CAN'T be a leak...a leak wouldn't do that...
we'll see wont we...
when you goin?
LOL
We do...and then shaddapp all the people who've said...I CAN'T be a leak...a leak wouldn't do that...
we'll see wont we...
when you goin?
MBWorld Fanatic!
Joined: Nov 2014
Posts: 2,575
Likes: 407
From: Olathe, KS
'13 C63 AMG P31
What mode are you using/driving in, C/S/S+/M? If you are revving it in C mode, I can understand the difference in tone. Also the more aggressive and consistently you drive in S,S+,M the more the car adapts to that type of driving. Also lower your rear seats, you'll be able to hear the exhaust note better 
.
.
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
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From: Toronto
C63 Coupe
What mode are you using/driving in, C/S/S+/M? If you are revving it in C mode, I can understand the difference in tone. Also the more aggressive and consistently you drive in S,S+,M the more the car adapts to that type of driving. Also lower your rear seats, you'll be able to hear the exhaust note better .
.Forgot to mention that actually, yes tested in all modes a few times and its the same across the board for that 'testing session'
Its been sitting for a couple hours now...I bet I go outside and fire it up and its nasty...meaning lovely.
Morning starts are always eye opening ear cleaning. But by the time I get to work, c, s, s plus or M ...shes a baby lamb during revving.
I got a MB scanner going on it tomorrow without cel's but apparently the logfiles will show something if it doesn't throw a cel.
thanks gents.
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
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From: Toronto
C63 Coupe
my seats are sunk flat...im 6' 4 lol and I drive with the window down in minus 20 to hear it lol
ill try ripping it in S plus all the way to the mall then test it when I get there...update all later
ill try ripping it in S plus all the way to the mall then test it when I get there...update all later
MBWorld Fanatic!
Joined: Nov 2014
Posts: 2,575
Likes: 407
From: Olathe, KS
'13 C63 AMG P31
A good video for reference on sound:
<iframe width="560" height="315" src="https://www.youtube.com/embed/iK2DILwmcuQ" frameborder="0" allowfullscreen></iframe>
MBWorld Fanatic!
Joined: Jan 2011
Posts: 2,159
Likes: 160
2006 E55
I don't think my car is able to lower the rear seats ... ? Thank you.
Member
Joined: Mar 2015
Posts: 220
Likes: 3
2012 C63 P31 black/black
Look in ur trunk. You will see the rear seat release there.
MBWorld Fanatic!
Joined: Mar 2008
Posts: 1,455
Likes: 49
From: Bay Area, CA
2009 C63 AMG
A leak or maybe if the new piping is hitting the body underneath maybe it is pulling timing because of knock? I have the resonator delete but not the 2ndary pipes...that's next!
Member
Joined: Dec 2015
Posts: 81
Likes: 6
From: Houston, Texas
C63 AMG
I have experienced the described "sluggish" rev in park only once and it was the day that I deleted the secondary cats. I personally believe it has the do with the difference in exhaust pressure? I suppose its possible that the ECU isn't compensating properly when the motor has no load on it.
MBWorld Fanatic!
Joined: Jan 2011
Posts: 2,159
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2006 E55
Any thoughts? Thank you.
OP - sorry for the thread hijack!
Thread Starter
Junior Member
Joined: Apr 2011
Posts: 25
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From: Toronto
C63 Coupe
Watch "2nd cats cut no res replaced with ss X pipe" on YouTube
And then this...
She was healthy above... Then slowly.. Surely it's worsened
Like here in C mode
Watch "Res cat cut but... Somethings up" on YouTube
Watch "Res cat cut xpipe" on YouTube
She was healthy above... Then slowly.. Surely it's worsened
Like here in C mode
Watch "Res cat cut but... Somethings up" on YouTube
Last edited by Dally; Mar 23, 2016 at 11:46 PM.
