OK, so what is the sensor pictured, that has two vacuum lines and a two wire cable attached? And what would be expected if there was a crack in the top part of the green plastic connection?

 

 

M.

OK, so what is the sensor pictured, that has two vacuum lines and a two wire cable attached? And what would be expected if there was a crack in the top part of the green plastic connection?

 

[ATTACH]5004[/ATTACH]

 

M.

 

Well, it's not a sensor. It's a vaccum solenoid. It's turning on or off vaccum to something. Depening on which side the crack is on, inlet or outlet I would expect different things. If it's on the inlet side I would expect a change in idle speed, and what ever it was switching vaccum to not work, which is usually something emmisions related. If it was on the outlet side I would just expect what ever it was switching vaccum to not work.

It's probably the canister purge solenoid. It looks like they relocated it from the older legacies/imprezas.

Well, it's not a sensor. It's a vaccum solenoid. It's turning on or off vaccum to something. Depening on which side the crack is on, inlet or outlet I would expect different things. If it's on the inlet side I would expect a change in idle speed, and what ever it was switching vaccum to not work, which is usually something emmisions related. If it was on the outlet side I would just expect what ever it was switching vaccum to not work.

 

OK, I wasn't sure which way around it worked, whether the pressure difference was opening/closing a switch or, as you suggest, the vacuum line is controlled by a solenoid. Suffice to say that my cousin was having real problems diagnosing some serious performance issues until he stumbled upon the cracked unit. Even two local Sub techies didn't know what it does, but they do cost $NZ70 to replace.

 

M.

 

BTW this is an EJ20TT, and this unit in question is under the alternator cover thingy, to the left (looking from the front).