Here's one for you 16v specialists, how can you make a KR work without the ISV and what is involved in doing this? I know its possible as i have a friend with a mk1 that has a KR with no ISV. Its lumpy when idling cold and then fine when at opperating temp, and it NEVER lets him down. Here's a pic of his bay: So, how is it done?
you just have to raise the idle a bit, and put up with poor running when cold. you can also use the mk1 AAV in place of the isv, seems to work fine for some
I tried taking it out and replacing it with a piece of pipe and got nowhere. Do ypou need to take all the control box out too?
no that shouldnt effect anything, unless its broken which from your other thread it could be. just unplug the unit that will rule this out. you will have to change the idle setting to get it to run, and maybe the co will want a fiddle too to compensate for the idle screw changes before it'll go
Right ok, well my battery is totaly flat now from trying to get it to go. Got a friend bringing a charger round later.
I bought a new battery just now, didnt realise i had money. Silly me. Right so ive disconected the ISV controll box, and turned the idle up a little bit on the throttle body screw and all she does is turn. Got a little puff out of her but that was it. Ive checked the spread of the injectors and they are all tickidy boo. Ive got 1/8 of a tank so im getting a lift after work to get some more fuel to try again tomorrow. All the intake ducting and vac lines are ok and connected. Is there anything else that could be stopping it?
does the rev counter jiggle, and are you seeing a spark? just a thought but check the over-run cut-off valve they like to fall off and not easy to see on some as burried under the intake boot/behind the airbox. could be the fuel pressure has dropped, mine did this one day and needed a new filter. also same happened on my mk1 cabby and that was the non-return valve on the fuel pump
I've got spark yes. I don't have the over run valve on the airb ox as it was faulty so have blocked the intake elbopw where it goes in. The mech I know said it sounds like an intermittent pump so om gonna get a new pump and filter now. The rev s do jiggle too yes.
I ran without an ISV for years, just learned how to left foot brake and keep the revs up when it's cold!
Ahh right. How were the 5th injector and WUR connected to the vac hose that the ISV goes onto that runs to the airbox?
isv gets a feed from there and the inlet so it can adjust the idle, it regulates the amount of air that can bypass the throttle and go direct to the inlet. but wur vac comes right off the inlet as its pre-isv
Excelent answer. I've got a fairly strong smell of fuel coming from the back end of the car when I crank it over. Gonna investigate now.
Found the problem! Two snapped wires to the hall sender. And theres no way on earth im gonna try and repair them! In other news, i couldnt find anything suitable to cap the vac pipes off with so i have put a piece of plastic pipe where the ISV would be. Should do the trick a bloody well hope!
what you have with straight pipe is a massive air leak past the tb. this air is still metered though! so just a case of needing to wind the idle down a tad to get it back where it needs to be
