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Author Solved! - revs drop going into idle!
TOMAS
Member

Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
6th Mar 04 at 13:01   View User's Profile U2U Member Reply With Quote

I know a few of you said you had similar problems to me when I put this up a while ago. I have a 1.2 16v lump, for the past 8 months when I come off the gas the revs have been going REAL low and nearly stalling and then rising to normal straight away! Its been really annoyning and has gotten worse over the past month. Ive been reluctatnt to buy a new ICV even though I was convinced it was that. Well it wasnt!

After taking the plastic inlet off and looking into the carb and playing with the circular throttle bit to see how hard/easy it was to turn (whatever its called) I noticed it was sticking against the walls, as it was turning back too far! Simply turned the torx screw a few times to adjust where it stops at and now its purrfect! Basically the throttle was closing too much and sticking, the idle control was pushing to try and move it back slightly but because it was sticking it was taking the couple of secs to unstick and causing the revs to drop big time!

OMG 8 months of shitty driving now cured, only for me to chuck the engine next month for a valver
MoNkEy MaGiC
Member

Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
   6th Mar 04 at 17:51   View User's Profile U2U Member Reply With Quote

yes mate i think u hav answered the problem to most of us corsa owners with bad idle problems!!!!!!

ive had bad idle problems for while, and thought it was the ICV?

but it got better now, i guess the throttle body must of been clogged up and sum how got uncloged which would explain why the problem got better by itself

im gonna take it of and giv it a good clean
MikeH
Member

Registered: 3rd Apr 03
User status: Offline
6th Mar 04 at 18:09   View User's Profile U2U Member Reply With Quote

Oooh i hope this is my solution too... any chance of some photos?

Always a bit nervous of taking the throttle body appart.

[Edited on 06-03-2004 by MikeH]
TOMAS
Member

Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
6th Mar 04 at 18:11   View User's Profile U2U Member Reply With Quote

Yup, give the lower adjustment screw a couple of turns aswell - on mine I had to take the top throttle body off (4 torx screws under the plastic inlet manifold) to get at, I noticed that the plastic stopper that stops against the screw face had worn down slightly with constant hitting (compressions).

Also explains why mine was so bad when cold or 1st driven as it had stuck there overnight also the throttle body would be ever so slightly smaller when cold than hot (thermal expansion). Its great, so good im wondering wether to delay the conversion and get a few more miles out of my lump first!

[Edited on 06-03-2004 by TOMAS]
TOMAS
Member

Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
6th Mar 04 at 18:20   View User's Profile U2U Member Reply With Quote

what engine Mike? Bit dark now. For those of you with X12XE...

Remove the induction pipe from airbox to plasic inlet.

Undo & remove the three torx screws that hold the plastic inlet on.

Lift the inlet off and move it to one side (some air pipes will still be attached but just move it away from its seating)

Undo & remove the four torx screws holding the throttle body down (same size torx as the plastic inlet)

Now lift the throttle body as high as you can (throttle cable will still be attached along with some more air pipes but you only need to lift it about 1" so that you can now gain access to the adjustment srcrew.

Give the adjustment screw a few turns with small torx bit (trial and error).

Refit as reverse of above.

Now test and make sure that idle is not above 900rpm, if it is youve turned it too much and away you go!

Dont worry, nothing will suddenly fall off or is sandwitched under the throttle body to cause you problems. The only thing is adjusting the screw is fiddly as theirs no room to work (20-40 degrees of movement with wrench) and just make sure you drop nothing down the big hole LOL

[Edited on 06-03-2004 by TOMAS]
MikeH
Member

Registered: 3rd Apr 03
User status: Offline
6th Mar 04 at 18:27   View User's Profile U2U Member Reply With Quote

Yeh mine is a x12xe as well.

So i'm turning it clockwise am , or is it a case of seeing which way it needs to be turned?

Thanks
MoNkEy MaGiC
Member

Registered: 12th Apr 03
Location: West - London Drives: Corsa GSi
User status: Offline
6th Mar 04 at 18:28   View User's Profile U2U Member Reply With Quote

so i guess its harder to fix if u got a C16XE
TOMAS
Member

Registered: 7th Aug 02
Location: Nottinghamshire
User status: Offline
7th Mar 04 at 19:43   View User's Profile U2U Member Reply With Quote

Mike as you look at the adjustment screw head it needs to go clockwise to make the screw face protrude out more into the plastic stopper section of the throttle cable rocker.

 
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