[s-cars] Interesting state re: fuel consumption

[J. Khang]

"Fred Munro" <munrof at sympatico.ca> wrote:
> Even stranger economy point on my S6. No.5 coil finally bit the big one and
> after I replaced it, I took a 400 km road trip to Toronto. Fuel economy was
> 8 litres/100 km going down (~30 mpg) and exactly the same coming back. I've
> never gotten fuel economy like that on either of my S cars. It seems to be
> holding up in my daily commute as well. Can't figure that one out - must be
> something wrong :). Kind of nice at these fuel prices though.
>
> Fred Munro
> '97 S6

This is actually not surprising because the coil packs are deteriorating over time and the available firing voltage is dropping. I expect that the spark kernel is getting weaker and a new coil pack will make a difference by reducing misfires.
I had two coil packs fail recently and replaced all five because I didn't want to mess about with them again. Like you, I have observed improved fuel consumption. The engine also runs slightly smoother and there is more power.
Jonathan
'97 S6


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