We've had this Fabia for 7 years now and it has covered 102,000m.

It has just developed a problem. When changing gears, you come off the accelerator and press the clutch, but the revs blip up after the accelerator has been released and and the clutch dipped. It doesn't happen 100% of the time, but very often.

At one point, I dropped the clutch at 3500rpm and the engine revved up to 5000rpm (for about 2 seconds).

I could be imagining it, but I am sure that if you are driving in gear and come off the accelerator completely, it sometimes continues pulling for a couple of seconds.

I have googled and found one Ibiza 1.2 owner with the same problem, but no resolution posted.

Anyone clever out there that could help?

I have scanned with my OBD reader, and there are no codes.

Thanks

Neil

Maybe a dirty or failing accelerator pedal sensor thats sending wrong info to ecu.

Think they can be cleaned but never had the problem.

I am at my whits end with this now.

I have taken the pedal apart, and cleaned it, didn't help.

Then I got hold of another accelerator pedal and put that in, didn't help.

I put lots and lots of carburettor cleaner down the throttle body, didn't help.

I took the throttle body off and cleaned everything and checked all of the action, didn't help.

The really strange thing is that it only does it while the car is moving. If I sit stationary and blip the throttle, it is all normal (engine revs up then straight away returns to 700rpm). If I drive and put the car into neutral and blip the throttle, it sometimes revs up to 5000rpm and stays there for a second, sometimes only an extra thousand revs, sometimes it is normal.

Why would it only do it while the car is in motion. Is this an ECU problem?

Thanks for any help

May be a vaccum leak? Another possibility is the speed sensor I think its on gearbox at rear

from memory. It may explain why it only does it when car is moving. I would have thought a code would have been thrown up but it might be worth checking wiring/changing it to see. Check the brake servo hose as well as they are very prone to splitting. My sons idle was all over the place so taped his up and cured it.

Alasdair

Can your OBD device view live data?

If so, try to see whether the clutch pedal switch is operational.

Don't suppose it has cruise control? That would stop working if the clutch switch failed.

+1 for the clutch switch. 👍 On many other VAG's a failed clutch switch is known to cause similar problems including high idle sometimes and also snatchy gear changes. On an '08 car you can find the clutch switch operation monitoring with VCDS or similar scanner in the engine controller as live data under 'Measuring Blocks'. You can watch the figures change as the clutch pedal is pressed. It should trip just as you press the weight of your foot on the clutch pedal if it's working correctly.

Thanks for all the replies.

I have ordered a new clutch pedal switch. It's worth a try, although the car still does the revving while in motion with the car in neutral and the clutch pedal not being touched.

Just took the old switch out to get the part number and noticed that it is open circuit.

I took it apart and the wiper had snapped off. Hopefully a new switch will solve the issues.

Being open circuit I suppose it is thinking that the pedal is being continuously pushed. I'm assuming that the ECU makes calculations based on clutch position and speed info to adjust revs? Can't figure out why it is random though. With the switch broken wouldn't the behaviour be the same all the time?

1 hour ago, LCYCowboy said:

Being open circuit I suppose it is thinking that the pedal is being continuously pushed

Yes, it's shown as normally closed, push-to-break on wiring diagram.

Just received a replacement switch from autodoc. Strangely, the plunger is twice as long as the original, and when measuring the resistance across the two terminals, there is no difference when pressing down the plunger???

It turns out that the plunger on the old switch was stuck in. So the length doesn’t seem to be an issue.

However, the new switch doesn’t seem to switch (resistance stays the same regardless of the position of the plunger).

I fitted it regardless, and it seems to have fixed the over revving between gear changes.

I am pretty sure that it still keeps accelerating when you release the accelerator whilst driving though.