BigTex Posted June 15, 2012 Report Share Posted June 15, 2012 While out flying today I detected a vibration when the manifold pressure was at 25" or higher. When I backed it dow to 24" or lower the vibration went away. Changes in RPM seems to not have any effect. Also tried playing with the mixture and carb heat with no change... Thoughts? Quote Link to comment Share on other sites More sharing options...
jetdriven Posted June 15, 2012 Report Share Posted June 15, 2012 Engine monitor? EGT's change? Perhaps a dirty injector, and adding MP adds fuel pressure, which causes a larger power imbalance? wild guess. Quote Link to comment Share on other sites More sharing options...
BigTex Posted June 16, 2012 Author Report Share Posted June 16, 2012 No monitor but EGT on #3 is slightly elevated until the engine is leaned out. No injectors on this engine. Quote Link to comment Share on other sites More sharing options...
jrwilson Posted June 16, 2012 Report Share Posted June 16, 2012 Mine was a little rough recently. Was at 8500 feet and mp was about 22". The egt had an approx 75 to 100 degree rise on #2 cylinder, no change in cht. I wasn't sure what it was, hit carb heat and richened it slightly, and the problem went away. Egt came back down to normal. I checked my JPI troubleshooting manual and it said I had dirty spark plug on #2. Problem hasn't returned. Egts were normal the rest of the flight. Quote Link to comment Share on other sites More sharing options...
jetdriven Posted June 16, 2012 Report Share Posted June 16, 2012 Do a mag check inflight with the mixture at the leanest setting you can get. Report back. Quote Link to comment Share on other sites More sharing options...
BigTex Posted June 16, 2012 Author Report Share Posted June 16, 2012 Will do... I was doing some stop and goes before climbing out where I experienced the roughness. I plan on checking the plugs as well. I might have a fouled plug as well. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.