My tach reading drops to 0 under 1000 RPM. I have an EFII dual ignition system with the AFS dual RPM board. Ironically, my older ignition system was a dual LSE system with the same AFS board and the RPM was erratic above 2300. Any ideas?
My tach reading drops to 0 under 1000 RPM. I have an EFII dual ignition system with the AFS dual RPM board. Ironically, my older ignition system was a dual LSE system with the same AFS board and the RPM was erratic above 2300. Any ideas?
Did you have to change the pulses/2 rev with the new ignition?
Rob Hickman
Advanced Flight Systems Inc.
Thanks Rob. No, it is set to 4 pulses per manual. I tried 2 pulses and the RPM then is displayed too fast as compared to actual prop as checked by optical tach. Can the RPM board be bad?Originally Posted by Rob Hickman
Couple of things you can verify:
Ensure pin 31 WHT/ORN has +5v over pin 16 BLK.
Verify mag ground to firewall ground to ensure low Ω reading.
The 71420 should be wired into pin 32 of the engine sensor main cable.
You could also try a single mag connected straight to the EFIS.
Manual 3.02 Page 197
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