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Date: 2 Nov 2004 04:38:58 GMT
From: Dave Hinz <DaveHinznospamcop.net>
Subject: Re: Iridum Plugs- are they ok in my 9-5?


On Mon, 01 Nov 2004 19:57:34 -0600, DrDan <DrDannospamam.com> wrote: > I picked up 6 and installed them. Then I read somewhere that > the DI cassette or the trionic doesn't do well with other than > the standard copper type of spark plug as called for by saab as > original equipment. Whats the word? The Saab engine management system uses the spark plug to, among other things, measure the combustion mixture's impedance to decide when to fire the spark. It's a critical piece of engine instrumentation. If iridium was the right material for those sensors, Saab would have used it, and they didn't. If you google for alt.autos.saab, my name, and the word "impedance", you'll most likely find a couple of pointers to a (very) technical article that goes into exactly what they're using 'em for. Short answer, nope, stick with the NGKs that the manual calls out. Dave Hinz

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