John Backfiring happens when the mixture is too lean. If the exhaust stack has been replaced, the intake elbows might have been taken off as well. I would check for intake leaks at these elbows and for intake leaks in general.
If the engine behaves otherwise normal that is. Any abnormality is one indicator more toward the problem. Hartmut ----- Original Message ----- From: John Roach To: [email protected] Sent: Wednesday, October 24, 2007 4:13 AM Subject: [ercoupe-tech] Backfiring on glide I recently replaced the exhaust stack on the pilot's side of the engine. Since that time, the engine seems to be backfiring when I close the throttle to land. I checked it today and the backfiring seems to start between 70 and 65 mph. The A&P has checked everything he can think of and has no idea what is causing the problem. I was flying with the canopy closed and wearing a headset today and even with my poor hearing it seemed disturbingly loud. Any opinions welcome. John Roach N 2427H
