Hi people Ive had an opportunity yesterday to begin the journey of chasing down this miss in the engine / EC2 on radio TX. I discovered that the gremlin is getting into the EC2’s A computer but not the B Switching to B there is no hint of a problem. I’m thinking there are two substantive differences between EC2 A & B processors/computers. 1. The B computer has the capacity to turn off the leading and trailing coils for testing, that the A computer doesn’t have. 2. The A computer measures the intake air temp to determine O2 molecules in intake charge which the B computer doesn’t. So I’m wondering if the intake temp input (thermistor) on the EC2 A computer is the antenna for the RFI to get in. Disconnecting this line to the the EC2 A computer in order to identify if this is the problem is going to be a pain but maybe a necessary fault finding path. Has Tracy or anyone put a small Capacitor on inputs to filter RFI? Thanks for any input you can offer. Steve -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List.html