Engine starts then stalls, Help!

[simpreza2]

I went to start my car the other day and it fired right up but with in 10 seconds it staled. It would slowly decrease the revs untill it would stall itself out. At the same time this happened my CEL came on. I pulled the codes and I got 4 11(crank angle sensor), 23(Air flow sensor) 24(Air control valve) and 31(Throttle sensor). Whats goin on? how could all of those go at once? The car ran fine before all this happed.

The car could idle(for 2-3 min) if I kept the revs at 1.5-2k for about a min then let off the throtle but after a few min again the car would start to stall again and I would need to rev it up to keep it from stalling. It also feels like its misfiring, is this b/c of the crankangle sensor now working? or do I have a cyl mis-firing also?

Thanks
Jon

[Legacy777]

Try clearing the codes, and see if all of them come back again, or just one.

May also want to try the active diagnostics mode (green connectors)

[evolutionmovement]

I'd think it's most likely the IAC.

Steve

[DeusExMachina]

Wow, simpreza2 made my post for me. Today I finished reinstalling my engine into my Legacy.

After a stupid fuel pump mishap, I got it to start. It revved up to 1500 then died pretty quickly. I could keep it going with the throttle, but it continued to want to die.

Could it be that my IAC went while the engine was out (for some reason), or it was slowly failing. I replaced my flywheel with an Exedy 14 lbs flywheel, and possibly the rate of engine spin down is too quick for the IAC.

Any insight?

[vrg3]

DeusExMachina - In your case I'd say it's more likely that there's a vacuum leak preventing the engine from running right.

[DeusExMachina]

Hmm..if thats all it is I'd be quite happy.

Any tips on finding it?

[vrg3]

Start by checking every hose in the diagrams on this page:

http://www.graphics.cornell.edu/~v/vacuum/

Also make sure the 19mm hose from the resonator to the IAC valve is in place and secure, and that the two 19mm hoses on either side of the blowoff valve are correctly installed (one goes to a nipple on Boot B from the PCV diagram and the other goes into the turbo-to-throttle pipe).

[0perose]

old thread... but does anyone have a diagram like vrg3 posted for an N/A ej22? symptoms of my problem are similar to some described in this thread

[vrg3]

Doesn't the NA have, like, just one vacuum hose? For the purge line?

[Legacy777]

yup....it's very simple