Idle woes

[maxp]

Its been a week of sorting out issues with the car (8v digi).

I previously had an issue where the car would idle fine, but then the revs would jump straight up to 1700rpm as soon as id touch the pedal (this is with the idle screw completely in).

So i bought a new pattern part ISV (pictured), thinking this may fix it. As soon as i fitted it, the car idled fine like the old part did, went for a 2 min drive, and noticed the revs getting stuck a little bit.



Anyway, parked up, unplugged the blue temp sender, revved x3 over 2500 rpm, plugged back in.

Now, although it idles fine, the engine revs to about 2800rpm as soon as i touch the pedal! With the blue temp sender unplugged, it sits at about 1300/1400 rpm.
Again this is with the idle screw all the way in.

Totally at a loss now, appreciate *any* advice.

Have since plugged the old ISV back in and it is back to square one (at least its vaguely driveable).

[RhosneigrGaz]

Have u tried a new black temp sender?

[maxp]

Have u tried a new black temp sender?

I thought black sender was just for the dashboard display?
The blue was replaced less than a year ago, and i *think* it works, as the revs change when it's unplugged.

[Dan34]

Have u tried a new black temp sender?

I thought black sender was just for the dashboard display?
The blue was replaced less than a year ago, and i *think* it works, as the revs change when it's unplugged.

Might be worth changing it just for peice of mind, only a tenner or so

[RhosneigrGaz]

I cahnged my black one as the dash gauge was knackered, idles better since! 

[Steve_B]

was the blue sensor from vw or pattern part?

[theclash]

mate i feel your pain.....i had exactly the same problem was considering selling the car it pi@@ed me off so much. i changed all vac pipes cleaned isv new blue sender cleaned throttle body cleaned and adjusted idle screw and although it would idle when up to temp it would always rev on its own  i was determend to sort it out and after further fiddling found out the throttle cable was ever so slightly adjusted to tight and wasnt letting it return to the stop and operate  the idle switch underneath the throttle body she now idles and behaves perfectly. check your cable and check throttle link returns fully on to the stop......worth a try

[Alec]

I'm sure I read a thread a few weeks ago with the exact same symptoms as this man, I'll try and find it.

[Sam]

I'm sure I read a thread a few weeks ago with the exact same symptoms as this man, I'll try and find it.

Symptoms is a cartoon, i cant see the relevence

[Alec]

I'm sure I read a thread a few weeks ago with the exact same symptoms as this man, I'll try and find it.

Symptoms is a cartoon, i cant see the relevence

Dunno where that came from.... strange. I have been trying to sort my idle out today but all I have managed to do by changing the blue sensor is turn the exhaust into a bit of a flamethrower. Scared the living daylights out of me... I'm out of ideas now