A thread was opened on this on the main forum. I get the same symptoms on my MY93 Legacy Turbo(On startup, after driving for a short while, the idle hunts between 500/1200rpm).

General opinion was that the MAF was dodgy.

Any idea on if this could cause other problems, and possible costs for replacement?

Cheers

Steven

 

MAF sensor OR dodgy idle control valve.

The idle control valve is the thing on the pass side of the inlet manifold at the back. It has a light brown cap held on with 2 screws.

To see if the idle valve is working. remove the light brown lid thing, it's magnetically linked to the shaft inside so you will have to pull a little. Once removed the shaft should turn freely. If it doesn't, spray some WD40 on and give it a few light taps with a hammer till it frees up. You should then be able to chance the idle RPM by turn the shaft with your fingers.

Replace the cap, making sure it's roughly where it was when you removed it, but don't worry if its only a degree or two out.

Paul

 

have spark plugs chequed mine had degraded and i had that symtom + loss of power

 

could be a leaky dump valve if you have a VTA

 

Did you forget the O2 sensor that I said happened to mine ?
Cheaper than a new (full) MAF

 

02 sensor sorted mine out too..

Rob.

 

May be obvious but mine did it on my 93wrx until I did the earthing mod. Now she runs really sweet at idle. Just seems to have been poor earthing.

 

Yippee, its not only me with Leggy thats got it then. At last someone with Brains has give me possible source, thanks Pavlo. This shaft on idle control valve, How easy should it turn please.

 

Shaft on the Idle control valve shoud move easily with just fingers, if you need to use anything like pliers, then it's stuck.

paul

 

Thanks 4 that my friend. Owe you one.

Steve

 

I got Leggy too and had the same prob. However, mine was caused by a VTA dump valve. However, good to assimilate more info on possible causes. My car has always idled a bit too high - now I know how to fiddle it!

[Edited by NutterKam - 3/5/2003 7:45:59 AM]