GolfGTIforum.co.uk

Model specific boards => Golf mk2 => Topic started by: 1985sport on 22 June 2006, 17:57

Title: 8v K-Jet Idle problems
Post by: 1985sport on 22 June 2006, 17:57

Hi I'm about to embark this weekend on trying to track down why my mate's 8valve KJet golf is "idle hunting", quite badly actually.  Dosen't appear to have any starting problems though.

First off - what is the most likely cause? I remember a thread a while back with some reasons, but cant find it now.  I'll eliminate each possible cause as I ask him whats recently been done to the car in an attempt to sort it.

Thanks,

1985sport

Title: Re: 8v K-Jet Idle problems
Post by: mix on 22 June 2006, 19:00

probably a split vacuum hose somewhere....

Title: Re: 8v K-Jet Idle problems
Post by: rubjonny on 23 June 2006, 09:26

If it has an idle switch, make sure it clicks when the throttle is closed, & check the rubbber inlet boot for cracks, especially in the folds. Also get the CO & idle checked :)

Title: Re: 8v K-Jet Idle problems
Post by: 1985sport on 24 June 2006, 10:06

ive taken all the vac hoses and the rubber/plastic inlet manifold off to be cleaned. 
the throttle bodies are coming off today (with some persuasion - tiger seal!) as they need a clean and the idle switch dosen't click (thanks rubjonny) so its probably easier to replace the bodies rather than fanny around with the switch. (got some audi ones lying about with good switches).

Ive noticed a t-piece somewhere in the breather hoses, however one of the hoses from the T-piece is simply blocked off - i'll take a photo if i can but any ideas why this is?

Wasnt someone somewhere saying something about one of the replacement GSF parts (thermo-switch?!?) gave dodgy resistance and was causing problems?

Thanks for your help,
1985sport

Title: Re: 8v K-Jet Idle problems
Post by: rubjonny on 24 June 2006, 20:12

I think that may have been a GSF ECU temp sender for a digifant, apparently they are pants.  Obviously not relavant to K-Jet anyway.
I assume same can be said for other senders they sell, if you can I'd go for VW senders.

As for the vacuum pipes, check this out:
http://www.moddin.net/images/temp/golf/8vk-jet.jpg

Title: Re: 8v K-Jet Idle problems
Post by: 1985sport on 26 June 2006, 10:05

vac hoses clean, a cleaned aux slide valve put on instead of the dirty one, and the idle switch changed as it appeared that the little button on the exisiting one had dropped out!
the butterfly valve adjustment screw was wound back in until the switch just clicked. it was so far out that had the switch been on there then it would not have been contacted anyway.

anyway, did all that, better but not perfect and now he's decided to change the engine for one he had around the back anyway! honestly, sometimes why do I bother?!?

cheers anyway everyone.

1985sport

Title: Re: 8v K-Jet Idle problems
Post by: rubjonny on 26 June 2006, 10:13

Oh well eh  :grin:

Title: Re: 8v K-Jet Idle problems
Post by: 1985sport on 26 June 2006, 19:38

tell me about it!

and just to let you know the blanked off t-piece was apparently a valve that was in use for the cabin heating system, it was just blanked off as it works far better with out it now. apparently.

1985sport