Problem with throttle revving

[Davo13]

Can anyone help?

I've got a mk2 Golf Gti 1.8 8v.  The problem is it some times revs on it's own.  Someone suggested that it's the throttle valve switch that sits on top of the throttle.  Has anyone experienced this before and what can be done about it and if needed were and how much will the part cost.

Cheers

Any guidance appreciated

[Blue MK2]

Is your car tuned right? I think the throttle switch is for letting the ECU know that the car is on full throttle.

Mine revs up and down around the 1000-Rev mark. GTi's have an automatic choke to keep the car idle i think

[golfvr6]

Which engine is it? digifant or k-jet?

[richandhazel]

This may help you:-

http://homepage.ntlworld.com/richandhazel1/gti/profix/fuel/isv.htm#ISV

[Davo13]

Hey there,

It's a digifant. very strange it only does it sometimes and it usually does it for 5- 10 mins sometimes not even that and then it will stop.  

cheers

[golfvr6]

Maybe a problem with the idle stabilisation valve, also as a suggestion maybe get the car on a fault code reader. What does the car drive like?

[Davo13]

Cheers for all the pointers so far everyone, much apreciated.

The car drives like new mate sweet as.  It's only done 57000 miles.

Cheers

[roon]

What's the difference between digifant and k-jet and how do you know which one you have  

[golfvr6]

K-jets have a fuel distributor(like spaghetti junction) on top of the airbox, digifants don't, they have a fuel rail.

[roon]

why did they bother to have two types?