Xf Efi - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

208_Fireball · 08-13-2003, 21:20

Hi,

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...

Thanks,

Dave

208_Fireball · 08-17-2003, 16:40

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.

Can anyone shed any light on this?

Cheers,

Dave

MADXF · 08-17-2003, 17:25

What exactly are you trying to find this out for?

As soon as EFI came into the falcon range, the ISC was controlled by the ECU...which ever type of ISC it happens to be.

208_Fireball · 08-17-2003, 23:17

The idle wasn't controlled by the ecu in the XEs. They had the bosch fast-idle AAV, but the actual idle is open-loop. I know this because i know the bosch system, and studied an XE also.

I'm trying to find this out, because a configurable external ISC would be much better than a throttle-body mounted one...

Cheers,

Dave

Dreders · 08-18-2003, 00:25

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.

208_Fireball · 08-18-2003, 16:39

Thanks Dreders, I was just going from the Wheels and electronics australia articles which said that the first XF efis (there were 2 series) used the le jetronic setup.

Sounds like something could be knocked up pretty easily...will have to sus it out.

Cheers,

Dave

fordmuscle_83 · 12-13-2003, 04:18

208_fireball, im with you and pretty sure the series one and two were different as with the change in high swirl head.

208_Fireball · 04-01-2004, 19:05

Quote:

Originally Posted by fordmuscle_83

208_fireball, im with you and pretty sure the series one and two were different as with the change in high swirl head.

Which type do you have fordmuscle_83?

Cheers,

Dave

fordmuscle_83 · 04-02-2004, 02:23

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.

Pete

THELTD · 04-02-2004, 20:52

yes 1986 s2 are all unleaded, they also have indicators on the sides (well the zl/fe do)