klehman(at)albedo.net
Guest
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 Posted: Fri Dec 28, 2007 6:11 am Post subject: Powering the Ignition and Fuel Injectors on Egg. Subaru |
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Power loss to any of these circuits will kill the engine. Limp Home
simply means the engine has lost some sensor information and is
defaulting to preset nomimal values that will keep the engine running
but often with degraded performance. Some engines will run normally in
certain limp modes. For example it may continue to run normally after
the loss of either the crankshaft or camshaft sensor but it will not
restart if shutdown. If the engine is running well, I don't recommend
turning the "igniton key" off and back on in flight just because the
check engine light is on. OTOH that might fix the problem if it was an
intermittant sensor glitch and the engine is running poorly or has quit.
Some guys claim "limp home" problems but haven't even installed the
check engine light which reduces their credibility a bit.
If you look at the automotive wiring, all these wires are generally
bundled together with everything else so it is not critical to isolate
them. I like to use twisted pairs for things like injectors and ignition
coils if convenient though. I suspect that it makes more sense to
isolate audio wiring if possible rather than ignition or injector wiring.
Ken
bakerocb(at)cox.net wrote:
| Quote: |
12/28/2007
Hello Allen,
You posted: "QUOTE: 2) RED - 5A ECU Power. This wire provides power
for the ECU, the computer that controls your engine."
Does that computer incorporate a low power "limp home mode" for the
engine?
A fellow builder had his engine go into that mode on the second flight
and put his airplane down into an orchard. Airplane destroyed, pilot
badly injured.
'OC' Says: "The best investment we can make is the effort to gather
and understand knowledge."
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