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What are “exhaust flappers” / “exhaust valves”? |
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A “hard code” is displayed on the dash, as referred to above as CEL, DTC, and or MIL, showing the operator and/or driver of the vehicle that their is a mechanical issue.
POWER PLOTS
Here is a power plot of a 17 MB C43 AMG with a proper functioning “exhaust flappers” (below)
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Here is a power plot of a 17 MB C43 AMG with malfunctioning “exhaust flappers” (below)
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Here is a power plot overlay of a 17 MB C43 AMG with malfunctioning “exhaust flappers” (below)-vs-proper functioning “exhaust flappers” (below)
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What can be done to fix this issue? |
Most of members vehicle’s are still under warranty so we would advise going to your dealer to have this fix as it could be the following:
Exhaust Flapper is jammed
Damaged Exhaust Flapper
Damaged Exhaust Flapper Arm
Bad Exhaust Flapper Module
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Will a “ecu tune” fix this issue? |
Any ECU upgrade, piggy back and/or ECU tune, will not fix this issue. We advise to fix the issue before getting any tune.
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What if I am already been “tuned” or installed a “piggy back”? |
If you have already started upgrading your vehicle and this issue has happened, you will need to address it as you are not running at full potential and can possibly cause further damage especially those running piggy-back style systems were the ECU signals are being simulated, manipulated and/or changed.
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Does this issue affect boost? |
Yes it does. Boost levels are drastically dropped due to the malfunction. On a “ECU tuned” vehicle, it can cause improper boost stability.
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We hope this was informative as we continue our support for the community. |