the exhaust valve flapper malfunction does not set a cel. if you unplug the flapper at the solenoid you throw a silent code in the dme indicating an open circuit. if you leave it unplugged there is no code as the component is not an emissions component. if you read the post by ct, the exhaust the op installed is catless, which will throw an emissions error code as there are no cats. the flap has nothing to do with emissions.
Originally Posted by gotrice415
Ok so you just said it youself. How is that not accurate? There are dpdw's that control the wastegate which is vacuum to it. Since you have an exhaust installed by VDC im sure they blocked off the vacuum line and retrofitted the DME software to ignore or not activate the flap since it ha been deleted.
So if you dont do that what do you think the DME does? Sets a fault for activation and vacuum leak causes lean mixture faults.
leaving the vac hose unplugged will NOT set an emissions fault or cause any kind of lean/rich condition...
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Last edited by Orient330iNYC; 10-07-2012 at 02:52 PM.