Help - Car stalling at junctions

[garycat]

My car occasionally stalls when I arrive at a junction, traffic lights, roundabout etc, depress the clutch and come to a halt. It's a '03 WRX with 133K miles on the clock. It has only happened about 3 times in the past month but that's a lot to me considering it's previous 100% reliability record.

So... what are the prime suspects? Fuel starvation? MAF?

[*Al*]

MAF is a good start, also inlet/hoses air leaks?

[Superhoop]

Havde you checked the clutch master cylinder (assuming it's a hydraulic system)?

If the master cylinder is leaking internally, then it's possible that the clutch isn't fully clearing - Meaning when you dip the clutch, the gearbox is still partially connected to the engine - This additional load on the engine will cause it to stall - Quite common on RX-7's, and happens most commonly when the clutch has been operated a few times without fully releasing the pedal (i.e when sat in heavy traffic at junctions)

Edit to say: The obvious sign of this concern is the clutch biting point changing (getting closer to the floor), when stuck in traffic..

Edited by Superhoop on Friday 28th January 11:15

[Gaygle]

Idle control valve!

[wolf1]

Idle control valve is an issue on most Imprezas however unlike the one's fitted to most other cars they are surprisingly expensive.

[garycat]

Gaygle said:

Idle control valve!

Yeah I did wonder about that too, as my daughter's Ka had the same problem and I was able to fix it by removing and cleaning the ICV.

I'm also getting the ECU warning light flashing at me occasionally. I don't know if it is related but that normally indicates a lambda sensor problem I think.