i may have told you this but here it is again! if i havent!
there has been queit a few people with high idle problems. and most people seem to think its an isv fault or something to do with the temp sender but as long as the isv is buzzing and clean it isnt the isv...........
i have had the same problem with my idle for years
it just wouldnt settle! or it would idle high and then drop and keep revving up! very annoying...and the cause the throttle switches! one controls the idle and tells the ecu when the throttle is closed and puts it in idle mode! and the other one does the full throtttle.
i only found out that the switch was faulty when i brought another throttle from a mate and he said the throttle switches dont work........... so i plugged my connector on it and they were still on the throttle body which i brought and all of a sudden it idled! i opened the throttle in my hand and closed it it reved up and then idled so thats how i knew it was the throttle switches! the lad was right one of the switches didnt work but i'm glad the idle one did as this was the only was i found out it was the switches if i hadnt of done this i'd have still had the revving up problems!
and all long i use to keep tapping the isv thinking it was this when it wasnt!
it even went to circus side and they just screwed the idle all the way in it was pretty tight! so it proves they know naff all about electronic idle problems!
god help them with the mk 5 faults........ if they cant fix a 17 year old car how the hell are they going to fix a car which everything is controled electronicly!
so if your idle has never been right and is always idling high or starts to you know what it may be!
on saying that the wiring can snap and this causes the same problem........ if the wiring to the throttle switches look ok get a mutimeter on it and it should read 5v with ignition on if it doesnt then theres a break in the wiring!
so in the future if any idle problems appear just remember to see if all of the switches on the engine work ok!!
