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Trying the B controller should always be the FIRST thing to try since it is the easiest. This needs to be ingrained in all EC2/3 users mental (or preferably written) engine failure check list. Everything including the coil & injector drivers are swapped out when selecting B controller. Based on the number of time I have asked if the B controller was tried when called about an engine anomally I have concluded that very few builders are even aware it it there : ).
Tracy
Sent from my iPad
On Mar 21, 2012, at 3:58 PM, Mark Steitle <msteitle@gmail.com> wrote:
I have been chasing a problem with my p-port 3-rotor where the #1
rotor cuts out at around 3800 rpm, but comes back at around 5000 rpm.
When this happens, I can hear a change in the exhaust, and I see the
EGT on #1 drop way down to around 500*, so that's how I determined
that it was the #1 rotor. The other two rotors continue to run
normally.
I have tried swapping coils, replacing the #1 rotor's plugs & coil
wires, and swapping injectors. I have not tried the B controller, but
that sounds like what I should try next. My suspicion is there may be
a defective coil driver circuit in the EC-2. I have borrowed another
20B EC-2 to try, but won't be able to do the swap until this coming
weekend.
Since things have been so quiet on the list, I thought I would post
this strange problem and see what suggestions others may have.
Mark S.
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