what causes wondering iddeling

[nip]

hi all ive had this problem for ages but now when i tap the accelerator its revs and stays at about 2000 rpm any ideas what controls the iddeling cheers

[newsh]

Idle is controlled by the computer via the timing and the ISV, it has to have a signal that the throttle is closed from the TPS (throttle position sensor), check that this clicks when the throttle closes and double check with a meter pins 4 - 6 IIRC. Theres a test on S2 Central, you're only worried about the switch aspect so ignore pins 1 - 3,
if that is ok then take off the ISV and flush it out with WD40.

[nip]

hi there newish the throttle switch doesnt make a clicking noise but it never has done since ive had it, another thing when it runs high i push back on where the accelerator cable goes onto it seem to settle the revs but when i let go it revs high again, also whats a ISV

[terrybullwon]

isv is a idle stabalisation vavle, it sits behind your inlet mani and its a bosch part, give it a good clean

[nip]

ok cheers terry il do that

[PeteRR]

Also maybe worth checking that your throttle disc isn't being prevented from fully closing due to carbon build up in the throttle housing.

[terrybullwon]

ok cheers terry il do that

James, but thats ok

[newsh]

say "terrybullwon" to yourself out loud and you'll get it. (took me a while)

[terrybullwon]

you were right at goodwood john.......

[nip]

thanks pete, sorry james , u know im always goin on that the car dont seem to boost as it should do, i sprayed some ipa in the maf sensor module and the connector and then it seems to boost as it should do, 1 more question tho when cars ideling and u unplug the maf plug is the car supposed to carryon runnin of stall cheers lads

[terrybullwon]

mine runs when you unplug the maf just not very well

[nip]

sometimes mie runs too, but very rarely it stals,cheers matey

[philS2]

sounds like your throttle cable is too tight.

[nip]

cheers phil il try that tommorow