I've got a 2008 1.6 petrol auto (6 speed) Roomster, which I've had for four years.  Car had accident damage (front end, no work to engine) and has just been returned to me.  As soon as I drove it I noticed that if you brake continuously to a stop from above about 30mph, as the car nears a halt the revs rise to about 1200 and stay there - so the car's driving forward hard against the brakes.  Driving like this in town all the time - which is 90% of the car's life - is going to totally kill the fuel economy. 

 

Lift and re-apply the brake and the revs go down to about 800 as normal.  Put the gearbox in neutral whilst the revs are high and the revs stay high until you lift your foot off the brake, when they go down.  If you just pootle around - like in a car park, then the idle revs stay at around 800 - as it always used to at all times once the engine is warmed up.

 

Car was due a service which has now been done - at main dealer -  and made no difference.  Fault reported as part of service and the report came back - "no fault codes and problem not experienced on test drive".  I went out with technician who drove the car with me in it - albeit him driving harder than I would do and the fault didn't occur.  Then I got in and the fault was there straight away.

 

I don't want to go back to the accident repairer as their response when I contacted them about it was "no warning lights on when we 'ad it mate - must be all right".

 

This fault has definately started after the bump.  My thoughts are maybe a sensor is not working properly e.g outside air temperature falsely low so the car sets itself for extreme cold even when it's not.  Could something be wrong with no fault code showing?

 

Any suggestions?

Took to second Skoda dealer, who identified an issue with the left foot accelerator conversion.  Under certain conditions, the throttle wasn't closing fully.  Skoda dealer wouldn't touch it though - had to get the original installer back.

 

Hopefully now resolved by adding an extra return spring on the accelerator mechanism.  Done for nothing, despite th original installation being 5 years ago- which was a pleasant surprise. 
 

Result!

 

Glad you got it sorted.

Grrr, problem not solved.  watch this space.............

Return spring wasn't poweful enough to shut the throttle.  I did a trial with a much more powerful spring - which just made the throttle really stiff - and still didn't solve the problem.  I then noticed what I think is the issue  - which is the added mechanism is pulling the throttle pedal sideways slightly, enough for the moving part of the plastic throttle housing to rub on the stationary part .  I re-aligned the extra sping so it pulled the mechanism at an angle, to try and reduce the friction.  This seemed to solve the issue - as a temporary bodge.

 

Installer of the conversion came and removed the left foot accelerator assembly and refitted it - still with no charge - and put my spring bodge back!  All a bit Heath Robinson.

 

Fingers crossed.

Full marks for your ingenuity.  Heath Robinson bodges usually work.

 

Fingers crossed...

Still working...............