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2009 911 c4s misfires one 1 bank - any porsche techs here?
Bank 1 , cylinder 1, 2, 3 misfires only after full operating temp reached and rpm brought above 2000 rpm.
-swapped coils and plugs
-swapped vario cam actuating solenoids
-visually inspected cat, no deterioration visible, pre and post temps ok
-manifold vacuum ok
-smoke tested intake - no visible leaks
-air oil separator seems ok
-all measured values i can check with fuel, MAF, cats, cams, temps, voltages, are within spec/nominal
-intake flap actuator operates (can't see flap position)
The only thing that is off is the correction value for H040 = -25% which usually indicates an air leak after the throttle body if im not mistaken....
Any thoughts?
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