Even without the ISCV it's just not idling right, the idle screw just doesn't seem to do anything other than when it's all the way in, or all the way out. The 30-odd turns in between just don't seem to do anything. We had to take the throttle body off today to adjust the TPS (that was fun!) and I looked it over carefully - no stripped threads, no cracks, no damage to the spindle/butterfly, gasket is undamaged. Nothing.

Warmed up and with no electrical load, yes we can hit a sweet spot on the idle to get it around 800-900rpm. But I can't make it 1000rpm or 1100rpm, for example. It also wants to hunt all the time (I can't get it to sit at 800rpm for any significant length of time).

I haven't tried disconnecting the amal valve. I can give that a try. At this point I'm willing to try anything.

In addition to the idle bypass screw I have a new act and ect sensor coming. If I could get it running close enough I'd finish it, get it MOT'd and take it somewhere to get it checked thoroughly, but at the moment I don't think it's near enough running well to even get through a test and don't want to risk driving more than a short distance in case it's too rich or too lean.

There's a local Ford meet at Ryton this tuesday, I'll have to see if I can grab the attention of someone with either an original Escort/Sierra Cosworth or mk1/mk2 conversion and see if they know any knowledgeable local tuners.