[s-cars] Loose spark plug detector!

[Bjørn Ødegård]

Soo.. that's what it is! I thought it was just my right foot doing its
fun stuff on a happy day! If I get to work without a single WOT, I think
I'm losing it.. ;o)
My commute is appx. 15km, and I use anything between 1.4 and 2.5 litres,
and there's quite a substantial difference between rain/dry/snow/summer
tires/winter tires
Apart from that, I guess this approach is quite nice!

Bjorn  :o)
'92 S4 (thirsty)
----- Original Message -----
From: "J. Khang" <jhlk99 at yahoo.com>
To: <s-car-list at audifans.com>
Sent: Tuesday, June 10, 2003 12:08 PM
Subject: [s-cars] Loose spark plug detector!


> Hello everyone. Here's a tip for those of you whose
> S-cars suffer from loose spark plug syndrome.
>
> I started suffering from this after I cleaned the
> combustion chamber with Redex because the threads
> became clean as a whistle.
>
> Anyway, I got a bit tired of dismantling the spark
> plug cover to check the torque every week so I started
> thinking about a means of determining plug torque
> remotely.
>
> It turns out that you can do this from the dashboard
> using the mpg display. My daily commute is very short
> and involves a very repeatable drive so I reset the
> meter every morning and monitor the mpg achieved when
> I get to work.
>
> The difference in mpg for my S6 between loose plugs
> and freshly tightened plugs is 18-19 mpg vs. 22.5-24
> mpg. This is a cold engine and I am going down a hill
> but the fact is that there is a 20-25% difference on
> average so this is a useable system.
>
> Further to that, if you are plagued by loose spark
> plugs then you want to tighten the plugs when the
> engine is warm or partly warm. I tightened mine after
> running the engine for 2-3 minutes and found a very
> large improvement.
>
> I suspect that the expansion of the aluminium head
> when it is hot is allowing plugs installed when the
> head was cold to rattle loose. This effect should be
> accentuated if you install the plugs in winter.
>
> Jonathan
> '96 S6
>
>
>
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