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Date: Thu, 15 May 2003 11:00:01 GMT
From: "Fred W." 
<nopsamt.ie> wrote in message news:ATIwa.13382$pK2.18344nopsam.indigo.ie...
> This is really serious
> I replaced the plugs in my 9000CS with those bosch four pronged thingies
in
> January. The engine seems the same but fuel consumption has increased from
> 30mpg to 23mpg .
> Are these two factors related?

Yes.  Get the correct NGK plugs.  Nothing else.  The engine management
system uses the plugs as sensors in the combustion chanber.

> Also ,if NGK plugs are the way to go why does the haynes manual recommend
> Champion RC9YCC4 plugs.

Mainly because the Haynes manuals suck.  I wouldn't use champion plugs in
anything more sophisticated than a lawnmower.

> Should I change the plugs ?

Obviously, yes.  ;-)

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