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[kev the omega novice]

i,ve taken the throttle body off and cleaned thoroughly , also the iacv too . the two breather pipes , also cleaned the small jet from small breather to throttle body . car idiled smoothly and drove nice for a few miles , then when car upto running temp of 85 /90 . car starts to occaisionally idle up and down from 500 + to 1500 revs , then drops to a smooth 500+ . any forth coming help would be much appreciated.

[tunnie]

thats quite a big jump in rpm, i'd check the throttle body butterfly is free moving and not getting stuck

[kev the omega novice]

thanks i,ll have a look at it tommorow , it did seem quite strongly sprung when i cleaned it but did,nt seem to be stuck  .

[Dave Elite]

If the revs are going up and down on there own then it wont be the throttle butterfly, more likely an air leak.

[Abiton]

Check for any stored fault codes with a trusty paperclip.   

[kev the omega novice]

as i,m no mechanic but a novice could you give me some pointers on the air leak front ie where to start. cheers.

[tunnie]

check all the breather pipes, throttle body, air filter all all secure, with the bonnet up and engine running run your hands over the throttle body areas, feel & listen for any leaks.

Symptoms i had with sticking throttle body was approaching junctions, you slow to a stop, butterfly does not close all the way, keeps idle high, then after a while sorts itself out, and back to normal idle.

[kev the omega novice]

thanks for the advice i,m on with the work today . hope i can get it sorted soon.

[kev the omega novice]

thanks for the advice .don,t seem to be any obvious air leak,s . lubricated butterfly and seem,s better , time will tell.

[Auto Addict]

Make sure the throttle cable hasn't been adjusted to compensate for idling.

[kev the omega novice]

the circlip on the throttle adjuster is on the 7th notch , working from the rear of the adjuster. does that sound aout right?

[hotel21]

You really need to ensure there is sufficient free play/slack.  One persons seventh notch is anothers 10th......   

[kev the omega novice]

thanks for that , there is plenty of play in the cable , so i ,ll go with it being fine.