I'm just wondering - i gather the EECIV controls the ISC in the series 2 XFs, but does the series one XF have an ISC? If so, what controls it? I don't think the jetronic computer had that capability...
Ok, i almost have things figured. The XE uses the bosch Auxilliary Air Valve, like the VK. The XF series 2 uses an idle control motor controlled by the EECIV. I'm still not sure, but i'm guessing that the XF series 1 uses the AAV as well.
However, i also saw a ZL fairlane that had an idle control motor, but was a different setup to the XF series 2.
The XF's were all run by EEC4 as far as I'm aware. They ran the ISC at the back of the rocker cover. They work on pulse width modualtion and are used with aftermarket ECU's with success. The AAV's work OK on stock motors but if you've got a bit of a cam it will struggle.
There will probably be some kind of PWM controller from Jaycar that would run an XF 2-wire ISC but I've never really looked. If you've got any electronic experience you should be able to build your own controller for the ISC. They work well at 100Hz, any lower and you might get popping in the intake, and just set it up to alter duty cycle based on RPM.
I used one on my car (big cam) with an Autronic SMC and it's a little champion.
I have xf series I. They dont run eecIV and also dont have ISC found on the back of the rocker cover on xf II. You will also find that all series I are leaded with the changes taking place with unleaded SII versions.
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