GolfGTIforum.co.uk
Model specific boards => Golf mk2 => Topic started by: aaron1980 on 19 May 2009, 21:36
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Hi i have a mk2 gti 16v it drives fine and pulls very well. the problem i have is when you let off the throttle if you dont ease it off the revs drop wright down and the car cuts out. someone said it could be the idle valve, does anyone know if i can use the idle valve off of an 8v golf or know anywhere that i can get one that will work or dose anyone have any otherr idears as to what is wrong with it.
when i got the car i fitted a new head gasket had the head skimmed and re seated all of the valves the compression is ok and the car drives fine other than the problem i have said about i would be gratefull of any help thanks Aaron. :grin:
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Hi.
IIRC, the 8v ISV is different to the 16v, but you can use a k-jet ISV from a Corrado or I think the 16v Mk3 Golf ISV is fine too.
Some other suggestions...
1) Clean the ISV very well. I use WD40, sprayed into the two holes, shake and rinse. Repeat several times until the WD40 comes out clear.
2) Remove and clean the idle screw in the throttle body. Is the rubber o-ring around it perished maybe?
3) Reset the CO2 and idle setting (http://www.golfgtiforum.co.uk/index.php?topic=22031.0).
4) Unplug the overrun cutoff valve and see if that helps. Perhaps try cleaning it out with WD40 too.
5) Check for air leaks.
6) How old is the fuel filter, can you hear the fuel pump prime on startup etc. etc.
(My bet is on No.3)
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plastic valve behind the airbox trust me clean it with brake claner or petrol or any thing to flush the sh!t out. i've been there, i've got a 16v gti and had this problem for ages, tryed replacing the isv and adjusting the timing and co, no good (to me). i've seen so many people on here goning on about this problem and i keep saying the same thing, but belive me try this before replacing things it's gotta be the cheapest option. let me know how you get on i'll hang my head in shame if it dont sort it out. :wink:
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i've seen so many people on here goning on about this problem and i keep saying the same thing...
A strange thing to say when you've got a post count of just 13?
And I guess you mean the over-run cutoff valve, which I mentioned in my post above. Unless you mean the pressure valve (flying saucer shape) behind the airbox.
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Got the same problem but on an ABF, off to the Mk3 forum with me :(
It happened today and the battery didn't have enough charge to start up again...
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this is the job of the over-run cutoff, make sure vac lines to it are ok, and check the yel/black wire has 12v with the ign on (its earthed via the isv control unit) also check the extra red/black wire to the coil is connected without it the isv control unit is in 'setup' mode and cant trigger the over-run to catch the revs.
If you put 12v to the overrun cutoff valve you should hear it click, if it doesnt, bin it.
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Hi thanks to everyone for there help im just off down the workshop to see if it works i will let you know how i get on in a bit. thanks again :grin:
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i've seen so many people on here goning on about this problem and i keep saying the same thing...
A strange thing to say when you've got a post count of just 13?
And I guess you mean the over-run cutoff valve, which I mentioned in my post above. Unless you mean the pressure valve (flying saucer shape) behind the airbox.
ok ok i'll change that to i keep thinking the same thing :wink:
i think it's the pressure valve i'm on about. i'll have to get a pic of it.
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Hi i have checked the isv valve as stated in the post where when the car has warmed up i disconected the breather pipe the the air box and bloked it and the revs stayed the same there is no (buzzing) coming from the valve so i think i will need a new one anyway i will try to get a new one tomorrow.
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...there is no (buzzing) coming from the valve so i think i will need a new one anyway i will try to get a new one tomorrow.
Remember its not a loud buzz. Your better off touching it while its on and it will be tingly (ooh err!!).
Before you splash the cash on a new one check that your getting volts through the wire to it - theres a possibility it might be dodgy wiring.
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Hi thanks i will have another look at it over the weekend. the mot man has gone on his holidays so it wont be heading down to newquey this year anyway :sad:
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plastic valve behind the airbox trust me clean it with brake claner or petrol or any thing to flush the sh!t out. i've been there, i've got a 16v gti and had this problem for ages, tryed replacing the isv and adjusting the timing and co, no good (to me). i've seen so many people on here goning on about this problem and i keep saying the same thing, but belive me try this before replacing things it's gotta be the cheapest option. let me know how you get on i'll hang my head in shame if it dont sort it out. :wink:
Mine has started occasionally doing this when dropping rapidly from high revs (e.g when dipping the clutch for longer than a second) - but with me being a complete engine simpleton, can you describe/show EXACTLY where this 'valve' is? I had a look last night, but nothing was obvious to me. :embarassed:
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look on the back of the airbox, theres a big black/grey plastic valve. has 2 big pipes to airbox/inlet boot, a 2 pin electrical plug and a thin vac hose. Only on 16v models tho so if its an 8v you wont find it ;)
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Sorry to steal the post a bit, I have this same problem but on an 8v....do i check the same things or is it different?
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everything conker says is valid on an 8v, except for the over-run cutoff bit :)
in addition if it a digifant check the idle switch clicks when throttle shut, throttle cable isnt too tight and the wiring to the throttle switches hasnt snapped. oh and check the setup as per the digi faq
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everything conker says is valid on an 8v, except for the over-run cutoff bit :)
in addition if it a digifant check the idle switch clicks when throttle shut, throttle cable isnt too tight and the wiring to the throttle switches hasnt snapped. oh and check the setup as per the digi faq
Great, cheers
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plastic valve behind the airbox trust me clean it with brake claner or petrol or any thing to flush the sh!t out. i've been there, i've got a 16v gti and had this problem for ages, tryed replacing the isv and adjusting the timing and co, no good (to me). i've seen so many people on here goning on about this problem and i keep saying the same thing, but belive me try this before replacing things it's gotta be the cheapest option. let me know how you get on i'll hang my head in shame if it dont sort it out. :wink:
Wow! just done this and 'ping' problem solved!!! :smiley:
Cheers all, what a wonderful resource this place is!
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Anybody know what this valve part is called? I have found out that mine has a split in it, hence the problem I was having. So it needs to be replaced. :(
Is it still available from VW, or is it a breakers job only?
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I've now made a few calls to various dealers/breakers/parts suppliers. Bottom line is that these are only available from VW and the part number stamped on it comes up as a 'Deceleration cut-off valve' on the dealers parts system. This would make sense because not only does the name explain the root cause of the problem, but it also ties in with what the poster who told people to clean it, stated.
The part number is "027 133 985 A" and costs £66.61 from the dealer. Unfortunately it's back order only, so it could be some time before I get my new one, 10 days at least according to the dealer. :(
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The part number is "027 133 985 A" and costs £66.61 from the dealer. Unfortunately it's back order only, so it could be some time before I get my new one, 10 days at least according to the dealer. :(
Just had a call from the dealer, the valve has arrived already! 6 days for a back order part, not bad! :cool:
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The part number is "027 133 985 A" and costs £66.61 from the dealer. Unfortunately it's back order only, so it could be some time before I get my new one, 10 days at least according to the dealer. :(
Just had a call from the dealer, the valve has arrived already! 6 days for a back order part, not bad! :cool:
hope it sorts the problem mate.
my 8v is driving me nuts because of the same issue. was fixed 2 weeks ago with a new flying saucer breather gromet, but last week developed the same problem again! replaced the ISV which made no difference, and checked all vac pipes. only one i can see being an issue is the short overbraided pipe next to the ignition coil associated with the MPG reading on the MFA, as the braided section has worn through.
the flying saucer and the breather pipe attached to it was all lined with mayo too... worrying... although it might just be were its being left for a few days at a time.