Jim Galbally

ok the way i thought an ISCV wored is that its a bypass for the throttle butterfly... ie air enters ISCV from before butterfly and is re-introduces after the butterfly...

and ofcourse the ISCV opens/closes bla blah to bypass more/less air hence increasing/decreasing RPM...

so...

how the feck does a remote ISCV work then? ive seen ISCVs just bolted onto hoses before the throttle with nothing going to the post-throttle side of the intake...

how on earth do these work?!?!

im sur theres something obvious im missing, but i cant understand how on earth they work!

Jon ERST S2

in the same way! one pipe in one pipe out.
I got a pic of mine somewhere..

Jim Galbally

jon, but what if there is nothing leading to after the throttle?!

JohnnyB

no Jim,

The ISCV just monitors the air and tells the ECU whats going on the the ECU adjust the engine

Jon ERST S2

Jim Galbally

so surely that'd just be called an "air measuring sensor" not an "idle speed control valve"

infact wait a sec, isn't that what an airflow meter's for

and how does the ECU adjust the idle speed with no air bypass for the throttlebody, it cant open physically open the throttle, so surely all it can do is adjust the timing and fueling to affect RPM

JohnnyB

it just add's or leans the fuel

JohnnyB

O jim The airflow meter is not good enough at low engine speeds

Jim Galbally

but then surely it wouldnt be an ISCV right? just a little diddy airflow sensor?

Stavros

All cars have ISCVs that bypass the throttle in some way, dont they? Post a pic of what on earth you on about Jimbo, as all ISCVs, even remote ones, have a pipe going to them from before the throttle, and one going to after the throttle...

Jim Galbally

i think the pic that got me thinking was kenny @ msd's car

but it wasnt clear in that pic... just reminded me about it, as ive seen a few before of just a normal lookin ISCV bunged in a hose somewhere

Stavros

Yea, lots of remote ones, but always 2 hoses, one leading somewhere before the throttle, and one leading to somewhere after, as like you know, they just allowing air into the engine when the throttle shut.

Infact on a MAP based managment you could have the 1 pipe to atmo and one to after the throttle as far as i can think....

JohnnyB

Steve just stick a volt meter on on and all it does is read the air flow.

The ECU has no control over it. The piston inside may automatily do somthing though

Jim Galbally

i beg to differ

GARETH T

remember it doesnt have to have a two pipes, aslong as it can increase the air flow into anywhere after the throttle body your ok!

Jim Galbally

gareth, how can it increase airflow without an input for this extra air?

JohnnyB

I could be wrong jimbob, But I remmber being corrected once.

Jim Galbally

well johnny, the valv inside dont open itself by magic, it opens when its TOLD to do so

GARETH T

i only said two pipes,,, it could have an air filter on it

Jim Galbally

ah i see what you mean there

JohnnyB

The piston will move due to sucksion its very light

Jim Galbally

i see your point there...

AlexF

Johnny you are utterly wrong!

The ISCV valve moves under direct control of the ECU as Jim describes!

Just coz its not connected doesnt mean the engine wont idle thou...

Alex

JohnnyB

I am probly talking shit ISCV the v bit is valve, But I remmeber somone conviceing otherwise

JohnnyB

A engine will idle with out ISCV your right.

foreigneRS

sorry johnny b, but you're wrong as far as normal ford ISCV's are concerned.they do as jim and steve are saying.

i can't see that somebody would build in a remote oe and then not have it go anywhere, that's just pointless. maybe it was one for anti lag that wasn't finished or had been partially removed?

AlexF

I know, I worked on them at ford

JohnnyB

Fook know's I think it was the fookin book of sum description and or mag were I read it.

I bet it was fast ford or the somthing

JohnnyB

I know guy's I know I know I am wrong the way jim doescribed it first was the way I though, but as I say I read somthing someware and it changed my mind