mark 2 golf hunting

[shooey88]

mark 2 golf is hunting/fluctuating at idle. when blipping the accelerator pedal and returning to idle the car hunts and idle fluctuates to 1500-2000 revs. tried cleaning the idle stabilisation unit and replacing with three others but same fault appears...any other suggestions?

[onzarob]

Is it a GTI or something else, Injection i would suspect an air leak, throttle body.

[shooey88]

aologies....MRK 2 GTI. tried adjusting fuel air mixture and helped a little but fault still there. checked and tested and no air leaks.

[fraser_edinburg]

check the engine temp sensor

[kow]

Have you cleaned out the throttle body with carb cleaner, set up the tickover as per the Haynes and then check all the hoses on vacuum side if fault persists, also have the CO set on gas analyiser. Is the micro switch that detects throttle at minimum working OK?

[mr brightside]

hello,i've been told that the idle stabilisation valve is so finely made that no amount of cleaning or whatever can rescue it. the advice from people i know is to buy a brand new VAG unit to eliminate it. best guess,good luck.

[1.9mk1golf]

on the back of the throttle body[bulk head side] there is a connector for the ,i think this is either idle control or stepper motor something like that,anyway the connections brake where they plug together ,the wires break,try that

[lvbug]

Ive have this problem with my PB engined GTI aswell , I did find one of these wires broken(idle switch) so I repaired it. The fluctuating of revs has stopped! but now theres another problem:confused: it idles high ; about 1000 - 1200rpm. Ive tried cleaning the idle stabilisation valve but no difference! It does idle ok after you put a load on the engine.

[1.9mk1golf]

does the engine do this from cold and then when you rev it ,it settles down. sorry need a little more info

[lvbug]

No its mostly when its warm or hot and just when you let your foot off the throttle to let it idle! But once you put a load on the engine eg turn the steering or put all the electric consumers on : it settles to normal idle speed ie 850rpm ! Sorry I dont mean to be distracting from the origional thread:Blush2:

[1.9mk1golf]

thats not something i have come across, but i would start by checking for air leaks , then check the throttle butterfly,linkage just incase its sticking,ill have a read up at work to see if i can find any more out for you

[Crasher]

I wrote an article for The Golf+ about how to set up the PB and resolve idle issues, if anyone wants it, PM me their email address and I will mail it tomorrow, it is on my work PC.

[1.9mk1golf]

what issue ive probably got it

[Crasher]

I can't remember exactly, about three or four years ago. I have revised it a little since as I remember little bits I missed at the time. I write lots of articles for The Golf+ in addition to my monthly Crashers Column and Q&A section. I did the Golf 1 rear disc conversion that was in a couple of issues back. I am just doing one on common Golf 3 ADY/AGG running issues.

[Smarty696]

Hi would it be posible for you to email me with the article you you wrote for Golf+ about how to set up the pb and resolve idle issues. It would be a great help.

Thanks..

[Crasher]

PM sent.