Date: Thu, 14 Oct 2004 16:21:17 +1300
From: Richard Sutherland-Smith <>
Subject: Re: 9-5 2.3lpt PCV/breather hose burst

In message <> Dave Hinz <> wrote: > On Thu, 14 Oct 2004 08:53:21 +1300, Richard Sutherland-Smith <> wrote: > > In message <> > > Dave Hinz <> wrote: > > > >> You're confusing timing with mixture. The engine management still needs to > >> know the mass of the air in the chemical reaction so it can put the right > >> amount of fuel into the chambers; the sensing plugs are for determining > >> when to fire the spark. > > > No they are not, AFAIU they are to check the result of combustion. > > Nope. That's what the O2 sensor is for. Here's an article (in English > even) that goes into way more detail than you asked for, but, er, you > asked for it... > > > > It also has some good stuff on how water injection works in this > context. > > Dave Hinz Yes, I have read that before, but that only SEEMS to deal with the timing aspect of the plugs as sensors. Please don't tell me off again, I am very sensitive. I quote from The Saab publication (270603) 1997 Form and Function about Trionic. "By applying a relatively weak voltage (approx. 80V) to the spark plugs, we can measure the density of ions in each cylinder and thus determine whether combustion was complete or if a setting needs to be changed. can adjust the quantity of fuel being injected during the brief moment the inlet valves are open...... which rations each and every drop of fuel and minimises exhaust emissions." Hilsen -- Richard Sutherland-Smith 19 Webb Road, Wanganui 5001, New Zealand

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