MSefi.com read only forum (Jan.15,2018)

I almost finished my MS-II v3.0
Engine Ford 5.0 code F, 1987, no MAF in stock

I have found the same post with answer, but not clearly understood it.

Q:

i'm sorry, i'm still very confused as to were i need to add this diode.. can anyone help?

A:

The best location is in the wiring harness itself, right at the IAC valve.

Assembling Guide:
You will also have to put a 1N4001 diode across the PWM Idle valve itself - the banded end goes to the 12 Volt supply, the non-banded end goes to the lead that goes to MegaSquirt (this diode is for flyback purposes on the idle valve)

Can anyone put this diode on this scheme?
http://www.DIYAutoTune.com/images/carte ... wiring.gif

Thanks and sorry for bad english)

Like you quoted - right at the valve itself. The +12v supply is the orange lead to the valve; connect the banded end of the diode to the +12v pin of the valve. The non-banded end goes to the ground pin on the valve, connected to the yellow lead going back to the MS.

My US$ 0,02´s worth, to be sure.
Hook everything up as per schematic . To positively identify the battery supply wire going to the PWM valve, unplug the valve and switch on the ignition.
Use a Voltmeter or simply a 12 V 5 W bulb. Connect one end of this to the chassis Probe the plug , the pin that gives you 12 V /where the lamp goes on is the +12V supply wire. Connect the banded end of the diode to this wire and the other end of the diode to the other wire in the PWM lead pair.
A bit of shrink tubing over the diode/wires will make it unobtrusive and nice!

Heribert

OK, i see)

Like on image below?

That's it! Like Heribert said, be REAL sure you have the +12v and GND wires properly identified, or else you're basically installing a short circuit.

OK, got it
Thanks!

I have stock diode on my Idle speed solenoid.
Will it work with MS?

Yes, it will.
Just make sure that you get the polarity right, the schematic in this thread says it all.

Best regards

Heribert

Anyway my Idle solenoid doesn't work... with stock diode or with 1N4001...

I'll try to replace it.