Maybe... It is boosting ok.... I'll have to check part numbers. I thougt a WRX was a 2 or 2.5 BAR sensor... Were as a STI is 3 BAR... If that's true... Then i don't have a spare wrx one.

Subaru says it shouldn't be "ticking" like it is.. I'm going to swap ECU next week...

Tim.

If you swap the ECU and it still persists...
Possibility of an intermittent wiring issue? i.e. loose/poorly connected wire somewhere.

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Thought about that too. If you unplug the boost solinoid.. The CEL comes on. I would hope if there was a doggy connection.. that would happen when it's pluged in. The connector were it plugs to the harness is fine. The pins are clean.

If i have to rewire from main realy to solinoid.. You would almost have to take the dash out to get to that relay. I was only able to get my hand to it.. That doesn't include a wire and a soldeing iron...

Also if it was a wire.. i thought it would start doing it the moment you turn the car on... It doesn't untill you drive the car for a bit.

I'll put another map sensor in tomorrow and see what happnes...

I think wire test would have to be straight to the battery (+) then the straight to the ECU (-).. That sounds doable..

Just had another look at the GC8 tech manual. It says the output pin (from ECU) to the boost solenoid should be 10V to 13V at idle and when ignition is ON (But engine off). That seams like an easy test. But does that "idle" mean when ever the car is at idle.. or only when you start it up for the first time??

That should mean that both pins should be the same voltage (One from + main relay), The other side from ECU.

Will check tomorrow.

Well i'm reading 0V at "on" (engine off). and 0V at Engine idle.. Any one else what to unplug there boost solenoid plug and measure the Black with white striped wired pin?

I check the pressure exchange valve too.. same result.. But it's meant to be 13V too.. wonder if the manual could be wrong...

Replaced main relay, Replaced MAP sensor, Replaced map sensor hoses, Replaced boost solenoid, Checked wiring between plug and ECU end,

Everything passes / or makes no change. Only thing left is ECU...

Have you reset the ecu? (ie Disconnect battery) I occasionally get the clicking in my 97 wrx too. I find that it also brings the idle up a few hundred rpm as well.

is it ticking at idle ?

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Yep, Ticking at idle. It never did that before untill now.

Well got ECU replaced today . And no more ticking yet. Have gone on several drives.. So i'm hoping that was it!

T.