[Diy_efi] Knock Detection using GM ESC Module

Bobby Riggs bobbyriggs at yahoo.com
Thu May 30 19:00:46 GMT 2002


My uneducated guess is that you are correct on
the low end but leaning out on the high end (due
to the white tip on the electrode).  The plug
itself is black so that tells me at one point it
was either rich, or correct, then turns white as
it "heats up" (probably around 3-5K).  You know
that at which throttle posistion you have the
engine at is a rough A/FR of what it is doing, at
that speed.  Try shutting off the motor at WOT? 
Just my 2 cents!
-Bobby
--- "marko.cosic" <marko.cosic at ntlworld.com>
wrote:
> > Learning how to read plugs is the only true
> answer.
> > J+S makes some serious K/S stuff.   It just
> looks for knock when it's
> likely
> > to be present not full time.  Too easy to
> sense noises that appear to be
> > detonation in a race engine.   An Acoustic
> detector is looking for noises,
> > ONLY.   If any NOISE is similiar to what it's
> looking for it will be
> > triggered.
> > Bruce
> 
> OT now an I apologise in advance, but could
> somebody read these for me
> please?
>
http://homepage.ntlworld.com/marko.cosic/misc/plug.jpg
> 
> We're having problems with an intermittent
> misfire on the car (2 litre T16
> Rover; 10:1 comp, Elec fuel/ignition, map
> based, 140hp), and I've done all I
> can think to do. Does it regardless of engine
> temp, ambient temp, load,
> angle the car is at, revs.... One minute its
> fine, the next it misfires, a
> cackle a pop and a BANG later and its blown the
> back box to pieces.
> 
> Marko
> 
> 
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