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Message
Welcome, David
Yes, Tracy is correct, there is
an unintended "sneak" circuit in the EC2 that permits power to
the EC2 through the injectors, however, while that provides power to the EC2, it
will not trigger the injectors unless the EC2 is getting a signal
from the crankangle sensor that engine is running.. Tracy thought that
folks would turn off their EC2 by turning off the Master switch thereby killing
all power to the EC2 and injectors - however, some of us"fooled" him and
have a switch for the EC2 power as well as disabling switches for the
injectors. You really should reconsider installing the disabling switches
as they really help in trouble shooting.
But, in any case, there is a possibility that you
are wired correctly and have one bad injector. It only takes one injector
stuck open to quickly drain the pressure out of the fuel line. I had
a bad injector which would stick open intermittently and it about drove me nuts
trying to figure out what was causing my problem until finally one day it stuck
open on a ground run up and I was able to identify the bad one. However, I
don't really think that is your problem, else, removing the fuse would make no
difference unless the injector is grounding itself internally.
You have clearly identified that power causes the
injectors to be open when they should not. So there appears only two
possibilities to me at this point.
1. You have an unintentional ground in your
wiring which completes the circuit for the injector - which only the EC2
injector drivers should do.
2. There is a problem with the EC2, however,
this is least likely. While there have been folks who thought the problem
was with the EC2, in 99% of those cases, it was a different problem.
I presume that the fuel ending up in the engine is
not from the squirt that the transit power-on condition causes. That
should only happen once as you turn it on and your fuel pump should bring the
pressure right back up. In fact with the pump running you'll never notice
the transit pressure drop.
The only thing I can think to recommend is to turn
your power off, remove the injector power fuse and unplug all your injector
connectors from their injectors and
1. with a Ohm meter check to see that Neither
terminal of any connector shows a ground (must do this independently
for each of the two terminals on each injector connector). There
should be NO ground on either terminal of a connector, this will confirm that
you do not have a wiring problem. - however, while unlikely - you could still
have an internal injector solenoid coil short to ground. So continue with the
next step.
2. Plug the connectors back on the
injectors one at a time and after each time - again check the terminals of
that connector now installed on the injector to see that there
is no grounding of the circuit. IF you get a ground indication after
you have plugged a connector back on to an injector then that
injector likely has an internal short to ground.
3. Unplug your harness as Rusty Suggested
from the EC2 and do a similar check.
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
Sent: Saturday, February 28, 2004 12:22
PM
Subject: [FlyRotary] Re: 13B - No start
problem
Thanks
Ed and Rusty. Now comes the dreaded work of tracking down my wiring
error. I had earlier suspected a problem because when ever there was
power to the main buss the light on the EC2 would come on, indicating there
was power to the EC2 coming through the injectors.
Tracy said this was
normal, but maybe he was thinking that the engine was running. I am sure
that the injectors are open because the system will not hold pressure unless I
remove the fuses to the injectors. But remove the fuses on the hot side
of the injectors and the light on the EC2 goes out and the system holds
pressure. This happens with either the primary or the secondary
injectors.
I am also having
trouble picturing where I could have gone wrong in the wiring. It seems
unlikely to me that I could have grounded all 4 of the injector leads.
Your idea about testing with the main connector unplugged is a good place to
start. But assuming that checks out OK (no ground with the connector
unplugged), I really would have no idea what to do next. I can’t believe
that I would put all 4 injector leads in the wrong hole. BTW, I did not
install an injector disable switch.
-----Original
Message-----
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell
Duffy
Sent: Saturday, February 28, 2004 6:31
AM
To: Rotary motors in
aircraft
Subject: [FlyRotary]
Re: 13B - No start problem
With the
injectors connected to the main buss, when ever there is power to the
injectors they are OPEN!!! This occurs even when the EC2 does not have
power. As I was trying to adjust my fuel pressure and check for leaks
(there were only 4 ;-) I had about 10 min of pump running time with the
injectors open before I discovered the issue. Now I'm sure I have quite
a puddle of fluid inside the intake and rotor
chambers.
I agree with Ed, and
everyone else who said the injectors should not be open just because they have
power on them. Are you sure they were open, or did you measure 12V on
them and assume they were open?
Try this- turn the
power back on to the injectors, and measure from each connection on the
injector to ground with a voltmeter. As Ed indicated, you should see 12V
on both connections to show that the injector is off. If you see 12V on
one, and ground on the other, unplug the main EC-2 connector and check
again. If you still have ground on one side, you have inadvertently
grounded the injectors in your wiring somewhere, which will cause an extremely
high idle speed :-)
Rusty (I want to make
noise again)
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