when fitting a l8 into a 2wd car should you change the idle speed control valve?

i know the diffence between them is the 4wd iscv is that is has an internal protection diode for back emf!

does the 2wd ecu have one fitted inside?

thanks for looking

 

Only thing you change is the TPS and the 2 outer wires swapped round on wiring to TPS

 

Steve@SCC,
i know thats what most people do,, but i was wondering if the back emf off the iscv could blow the driver

 

electro magetic force - a posh way of saying "reverse current"

 

bttt as i thought i was a good question

 

GARETH T, The L6 already has reverse EMF protection for the ISCV.
It just so happens that some later ISCV's have an additional diode as this valve is
used on other cars fitted with the weber IAW system (ferrari, fiat, lancia etc)

 

SECS,
thanks simon

 

Simon,
You may be able to help here then. The L6 and L8 items have a different part number. Are they perfectly interchangeable or not then as ive had unusual results a couple of times and to be honest, dont fully understand whats what with em.... fookin things

 

Stu - I dont think they are perfectly interchangeable size wise anyway. Mike R knows though.

 

They are precisely the same size to my knowledge.

 

I retract my statement then!

 

can you still get 2wd ones new? if not maybe they discontinued the 2wd item so all they could use was the 4wd item with the added diode

 

Not available any more IIRC Gareth.

 

But the arent available due to the last vehicle using em being over 10yrs old.

As with many Ford items, they only agree to stock it for ten years im told.

 

 

Like the saff jacking point covers are now no longer available (Last used in 1993) i discovered last week when one piece of shit stole all mine

Thanksfully a cuastomer sold me a set for £10 yesterday

 

 

If you mean you have problems when swapping valves, I have discovered
that on some wiring looms the ISCV connections are reversed.
So if you put an ISCV with internal diode on such a reversed loom,
the effect is the diode shorts out the supply from the ecu and does not work.
In this situation, the valve wires should be reversed and all should be ok.

 

ive had to do that before !!

 

I figured this was the case, the wierd thing being, wht are only SOME looms reversed?

 

its not the looms stu , its actually the iscv's that are internally wired differant , ive had some lancia units that the +ve is on the other side of the mulitplug !

 

Hmm..
There are deffo inconsistencies somewhere but there doesnt appear to be any rhyme or reason to it as i have both 2 and 4wd valves and they dont BOTH work ok on all 4x4s but they do on SOME

 

well i didnt know these was used on this great car, anyone guess what is it? (not too hard)

 

hmmm fairyari ???

runs twin P8's as well if its the model im thinking of !!

 

markk, nar its not an f40 mate

i started another topic and someone got it,, its a 288 gto