8 mpg !!! help

manxman

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I have a 320ce 24v 1991 model
Its only doing about 8 mpg ,air filter isn't new but ok.The car drives fine once your rolling and doesn't miss or seem underpowered at all.Its a bit of a pig on tick over while manouvering and can easily stall when you first press the throttle a little like the old days of keeping the choke out for too long.the car recently went through a mot test so i guess the emissions are ok.Any ideas please?
 

television

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The cold starting device will be stuck on
 
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manxman

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Thanks,Where do i find that then please?
 
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manxman

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Thanks for the help so far.I think ive found the valve, on the manifold but do i understand that its more likely to be the sensor that operates this valve ,if so where is that located? i turned the adjuster in through the middle of the airfilter anti clockwise two revolutions and the fuel consumption is alot better but obviously this is just masking the problem.i should have also pointed out when you kick down there's lots of black smoke out the back!
 

television

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2002 SL500, 216 CL500, all fully loaded


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