1991 mk2 16v KR calling a k-jet expert!!?

[H981CVV]

right fingers crossed i think i've cured it!!!! finally lol

i took my time cleaned the air bypass screw hole and perform the co2 and idle set up guide, waited until the car was warm to do it etc i set the idle at warm with the isv and breather disconected to exactly 980 rpm and then with it all connected up i took it for a ragin it was idling a bit high so i just adjusted the screw ever so slightly in to bring it down and now it feels a different car. I waited until it was stone cold again to try it from cold and it seems fine....fingers crossed. Thanks for all the help anyway peeps as always this forum is a full of solutions

BTW if i disconected the red lead near the coil the isv was still buzzing and i had to pull the plug of of the unit itself is this normal?

Ben

[rubjonny]

you disconnect the red lead to put the isv control unit into setup mode, the isv should still buzz!

[H981CVV]

so i should perform the set up guide again with JUST the red lead disconected to put it in a different mode?! but the i.s.v still buzzing, because i just did it with the i.s.v disconected at the plug going into the back of it. So it is wrong then, bugger!! because this morning i drove to work and it was still hunting even tho it didnt yesterday after i let it cool down so im upset now! haha

[rubjonny]

give it a try yeah, its possible the isv isnt healthy, but setup is free to try

[H981CVV]

okay ive set it up properly, i also cleaned and fitted a different i.s.v which i assume was working fine and i've got a 100% working one on the way to try aswell. I've changed all 3 temp senders aswell.

So far its still the same, but i've noticed that there is a vacum pipe with no home and am wondering wether it should have.

as you follow the pipes from the over run cut off valve, to a t piece, one goes up to the air mass meter thing valve, and on to the plenum chamber and to something to do with the brakes and one goes and hangs down near the bottom pulley.

has anyone got a drawing or know where it goes, i tried blocking it off but it was still hunting, im determined to cure this then the golf is almost mechanically perfect lol

help please

[Conker]

From [poor] memory, mines got two connections on the air intake pipe, one on the flying saucer pressure valve and one goes up to the brake line.

Defo shouldn't have an air leak! Looks like you found the culprit.

[H981CVV]

Thanks mate, then shouldnt it stop hunting when i block it off ?! I put my finger over it and there wasnt any change in idle. I have this at the moment,

a pipe from the over run cut off valve, 3 way t piece 1 goes to the flying saucer valve, one to the brake servo, and one to thin air.

[Conker]

a pipe from the over run cut off valve, 3 way t piece 1 goes to the flying saucer valve, one to the brake servo, and one to thin air.

Sounds like your missing the one to the underside of the big air intake pipe??

If you cover it with your finger, it will stop the leak, but maybe it needs to be attached to something to work!!

[rubjonny]

you have 2 connections on the servo pipe.  1 goes to the ignition control unit in the scuttle area, the other is T'ed off.
One of the pipes runs to the dash clocks for the MPG display, the other runs to another T piece behind the throttle body, on this 1 runs to the inlet boot air temp sensor to operate the warm air flap.  The other then runs round to ANOTHER T piece, one going to the overrun cutoff the other to the cold throttle enrichmnet valve.

[H981CVV]

Awsome, connected the vacuum pipes up as you described....what a difference!!! so from stone cold it ran warmed up and idle'd perfectly!!

i decided to obviously set it up again as per the guide but its a lot harder to set up. I can get the idle on the bypass screw to about 960 but its missing like hell so i adjusted to co screw but i cant get it perfectly smooth unless i raise the rpm with the co screw and then bring it down on the bypass screw, is it okay to do that??

Otherwise it a million times better, and restored my faith in the car,
 
Ideal