Hello,

 

had the roomster for about 3 weeks now

was getting between 64-67 mpg on my journeys too and from work.

 

I had the belt and pump done done on Wednesday 23rd and since then I’m only getting 57 mpg on the same journey, driving style hasn’t changed and tyres are at correct pressures.

 

Any ideas.

 

@theduke99 - Did the garage set the timing using a computer? Most people report slightly better power and fuel economy following a cam belt change.

3 minutes ago, theduke99 said:

Hello,

 

had the roomster for about 3 weeks now

was getting between 64-67 mpg on my journeys too and from work.

 

I had the belt and pump done done on Wednesday 23rd and since then I’m only getting 57 mpg on the same journey, driving style hasn’t changed and tyres are at correct pressures.

 

Any ideas.

 

Give us a clue mate, what engine is it? the 1.9 PD I presume?

 

 

?

Were you getting an indicated on the car 64-67 mpg or could the car travel 64-67 miles and use only 4.546 litres of fuel if you were filling the tank before doing 64 miles then after.

 

Have you reset the Maxidot, and brimmed the car and done enough miles?

 

Sorry....

 

1.9tdi and it was on the dash mpg

 

how would I reset the maxidot ? 

Someone will be along that knows how to on your car, or if you have the Owners Manual it is in there.

 

While your car was at the garage it likely reset.

Also the car was running while stationary at the garage, and hopefully out on a road test so used fuel.

That has lowered the Average that was showing before it went to the garage i would guess....

Why do people insist on assuming the instrumentation on their vehicles will give them a true M.P.G. Figure

Take to Garage Forecourt

Please fill it to the brim, (as in one click) reset odometer.

Drive till light comes on. (Fuel light) lol

Take to Garage Forecourt

Read miles or kilometres you have covered on the odometer (take a note) 

Refill vehicle (one click) preferably at same garage you filled it up at in first place.

Get a receipt for fuel 

Then do some maths 

usually  and this is an example    452 miles on  odometer/ 42 litres (put in tank = 10.76  = miles per litre.

Then multiply 10.76 by about 4.54 cos thats  how many ltrs are in a gallon and hey presto 48.85 Miles per Gallon!  not 60 + as the instruments tell you. 

That’s all good I know how to work out MPG.

 

but before I had my belt change the dash wash giving out a reading of 64-67 and now I’m getting around 57.

 

Now it might not be a true MPG but it’s down in any case 

^^^ What matters is if you ever actually manage to travel 64-67 miles and use only 4.5462 litres or was that just what Maxidot showed?

 

It looks like that was what was indicated you were getting. Only having kept records of fuel used and miles covered can show before and after the car being in for the work.

?

Have you checked yet how much fuel is needed to go 64-67 miles?

 

 

The actual fuel economy isn't being questioned here. Whether the on-board computer is accurate doesn't matter, what matters is that it's level of accuracy since before the cambelt change is either worse or better than it used to be 

 

Seriously though, the on-board computer might utilise one of the cambelt / timing related sensors, who's parameters have since changed with the new belt.

If the timing belt is in question then checking the torsion value with VCDS should tell you whether you are in the sweet spot. IIRC its 0.5