mk1 air hose sucking??

[GazzWalton]

There is a hose coming from down the back of my mk1 vtr block. It feeds into my inducion kit. However it sucks a mad amount of air in. This causes the idle to be very jumpy and the car jumps forward alot. If I put my thumb over the pipe and stop it sucking air it idles perfect! Any idea whats up? Should I clean ICV and MAS sensor?

[DaN90]

your car is what we call 'Hunting. This is when the revs go up and down at idle replace the pipe and it will idle perfect all the time.

[GazzWalton]

What do you mean replace? Like replace it with a new pipe?

[SaxoAL]

yeh does sound as if something is blocked somewhere.
Carb cleaner it out and give that a go maybe?

[GazzWalton]

Carb cleaner the ICV i presume and not the pipe. lol

[SaxoAL]

Well i think you could do with cleaning that pipe out, but yes, also clean the Idle control valve too.