The only thing that comes to mind that can completely disable the A
controller is if the +5 line to the air temp sensor gets shorted to ground (this
has happened to one builder). B is not affected because it does not use
the air temp sensor and its +5 supply is independent. The latest
version of the EC2 does not send +5 to the sensor so this failure mode was
eliminated. I don't know which version you have. If the instructions
show +5 on pin 11 going to air temp sensor it is earlier model, if it shows
pin 1 (ground) instead, it is the later version.
You
lost me on the last sentence. My instructions (which I'd still rather have
in electronic format) show pin 11 as "Temperature sensor power (Vcc)".
They also show pin 1 as "ground connection". Did you mean to say pin
11 as ground would be the later version?
Always possible that there is a hardware problem with A, but not
likely.
Agreed. No reason to worry at this point. I'll just keep an
eye on it.
The alternate map table load (with cold start on) is still active.
Don't know why it is not in the instructions unless I deleted it after the
latest updates to the algorithms which made that pre-load option mostly
un-necessary (how's that for an ambiguous answer?) What injectors are you
running?
You
can look for yourself in the instructions, since you probably remember where the
alternate map instructions were located. I skimmed through it a couple
times, and didn't see it. I've thrown away all my old instructions to
limit confusion with the newer software, but I had some notes
written down for use in the cockpit while
tuning.
The
injectors are 38 lb/hr, high impedance MSD units. Same as what I was last
using on the RV-3.
Tracy (mounting coils on 20B)
Planning to fry these too :-)
Cheers,
Rusty
(planning to fly my RV-8 by the end of the Summer)