Harris.

I cleaned my iscv 2 weeks ago as the car was hunting , all was ok but now the car idles at a constant 1500rpm , how do I turn this down? I know theres a little screw under the body which wont turn as its stuck .

Any ideas ?

Dave

opposite lock

iTrader: (3)

There should be a locknut on the screw?

My basic understanding of it is,

The engine must be up to temp with the fans coming on and idle valve disconnected and nothing on. Let the fans turn off.
850rpm -900rpm is what your looking for .
When plugging the idle valve back on it should raise the revs and settle back to its setting.

Harris.

That's great mate I will try that tomorrow . thank you for your help .

Dave

martysmartie

iTrader: (1)

The above is correct.

However, given this has only occurred since you started working on it.

Disconnect the ISCV... if the speed decreases to what the base idle should be, then it is set correctly and the valve is the problem.

Martin

Harris.

It only drops to about 1200 once unplugged

JamesH

iTrader: (21)

Did you properly strip the iscv to clean it?

Harris.

I didn't take it apart not , carb cleaner with a tiny screwdriver to gently push the spring down etc

martysmartie

iTrader: (1)

As above, the base idle needs setting, that or you have an air leak.

Martin

Harris.

Split hose or something ?

martysmartie

iTrader: (1)

It would be a gasket, the base idle is the first thing to do.

Martin

Harris.

Ive had to turn the screw all the way in , it was fine for 2 days now its back to 1200 rpm again

martysmartie

iTrader: (1)

It's an air leak.

Martin

Harris.

So a gasket somewhere has gone ?

martysmartie

iTrader: (1)

Yes, a Gasoline engine speed increases by air.

Therefore, there is an air leak, after the T/B, most likely a gasket on the inlet.

If you spray WD40 sparingly around this area with the engine running, you will hear a change in speed when you have found it.

Martin

Harris.

Thanks mate ,ill go look

Harris.

I disconnect the iscv and the revs drop to where it should be but dosnt run very smooth . I cant find any leaks .

martysmartie

iTrader: (1)

What do you define by "where it should be"?

At running temperature it should be 850-900 RPM, if it doesn't sound right it maybe it's too low, the base idle is the first thing to get right.

If not, then the valve is being told to open that much, but that's another discussion.

Martin