Jerry,
The last time I talked to Dean at Lockwood, they weren't loaning their
dongle, but I fly down there and have used theirs.
Your indications do point to a bad sensor.
Throttle sensor and waste gate I have discussed before so follow that.
If the waste gate moves OK with the engine off while moving the
throttle, then the throttle sensor is probably OK, and the servo is OK,
that leaves airbox / ambient pressure senders, temp and TCU.
Your comment on the boost coming on too soon can be easily checked>
Put the MP on the airbox plug and check your AB pressure for yourself.
Convert to millibars and check the graphs in the TCU manual. That
checks the airbox sensor but not its signal.
Hard to diagnose without the Dongle and the old Dos 8 reader. With only
a Dos reader, and a regular serial cable, I think you can still see
throttle position, time and RPM. Try it and see.
Now you can see why I spent the bucks for the new TCU.
As for the carb float arms, just setting them parallel to the carb base
seems to work OK. Even using the $100 tool, it still comes out that
way. So what the heck. If it isn't flooding and runs OK it works for
me.
Regards,
Still grounded for lack of a new fuel line fitting to the carb.
Bud
----- Original Message -----
From: Jerry Rehn<mailto:rehn@rockisland.com>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Sunday, June 02, 2013 1:01 PM
Subject: Europa-List: Rotax 914 yellow caution light blinking
<rehn@rockisland.com<mailto:rehn@rockisland.com>>
The yellow caution light is blinking. The warning lights come on and
go off as they should when the tcu is powered up, the waste gate cycles
thru properly at startup as well. With the engine running the yellow
light is not blinking at idle but starts to blink at about 2300 rpm and
continues as rpms rise, go below 2300rpm and the light goes out. With
the engine off and the turbo powered up the yellow light also is off at
idle throttle setting and if I advance the throttle the light starts
blinking and will stop as I pull back. So it seems that the throttle
sensor is sending a signal to the tcu as it moves. But what is the
issue? Sensor, tcu, other.
This issue just started on its own. So, the rotax folks would like me
to remove the tcu and send it in for diagnoses. Anybody had this issue?
I have searched this and have seen it discussed but the threads just end
with no resolution, so I know I'm not alone out there.
Also the turbo is working and does boost the engine but I pretty sure
it is adding boost too soon for the throttle setting which also points
to the throttle sensor.
Lastly my tcu is of the old type 4.5 which needs the dongle to talk to
a pc in dos! So I can't plug in my pc and test it myself. Anybody know
if a dongle is available and software? Maybe Lockwood or?
Regards
Jerry
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