Nearly sorted out my rough running 16v... One last bit of help required!

[rubjonny]

ah well, even if it dont fix it you got a known good spare handy
16v dizzies end up leaking oil everywhere eventually anyway 

[clipperjay]

So what colour are the spark plugs and when was the leads last changed?
I really hope the Hall sender sorts it our but your symptoms still sound timming related?
RubJ let corker come down South and lend him a hand LOL!!!
J

[Conker]

I've changed all the plugs and leads (at the start of this thread hoping it would fix it). The plugs actually looked quite good - Nice and light brown.

It might be timing.  I've also just bought a strobe timing gun to have a go at the weekend.

My wallet seems to be constantly vomiting out £20 notes at the moment.

[Gambit]

what does it idle at with the red spade/isv disconnected?

[Conker]

1000 rpm although its not rock steady. To be honest its not the idling thats the issue, its the reving.

[Conker]

Hehe...  Quickly tried to adjust the CO level last night with a screwdriver (not ideal!) to see if my miss-fire was anything to do with that (the car smells of petrol fumes, so thought it might be running too rich etc.). 

I completely b#ggered it up, the revs were bouncing from 500 to 1500, up and down, up and down. The car was spitting out all sorts of stuff out of the exhaust, stunk the street out.  My missus eventually came out and complained about the smell. I just turned it off and went inside.   

You've got to laugh.
Saturday had better be a good car day.

[dabill]

stick with it mate

[Conker]

http://simplythebest.net/sounds/WAV/WAV_files/miscellaneous_WAV_files/hallelujah.wav

Spent many hours on the car this weekend, but I've found the cause of the poor running - its the over-run cutoff valve. Here is the diagnosis:

1)  Throttle micro switch clicks
2)  ...But throttle micro switch test does not cause the revs to wander
3)  Unplugging the pressure diaphragm does not make a difference, although the rubber joint going into it is damaged
4)  All other air hoses seem fine
5)  Unplug the wire connector into the over-run cutoff valve and the car revs freely, and well      

So, so pleased.  Just taken it out for a thrash and loved it.  I guess this doesn't really solve the problem, but at least its running well (although I have managed to give it a wandering idle by d#cking around with the timing/CO2, but not too worried about that for now). Also the rev counter went very weird - it always showed 2000 revs more than it should. Weird.

So all I need to do now is find out if...

 - Its the valve itself
 - Its the controller box behind the centre console
 - Its the pressure diaphragm

The best bit... It can be my daily driver again! Thanks for the all the help so far dudes.