I have removed what I believe is my crankcase breather hose, that feeds into the air intake.

Now I have an issue that the engine wont idle, so presume thats my problem, but is there an illustrated pic of an Impreza engine on here?

I have looked- the classic catch can guide isnt helpful either, as mine is a 98, and cant see the pipe on that guide!

Cheers

Grant

 

Why have you removed it? Have you fitted a silicone intake pipe without a port for it or something?

 

I have blocked the pipe into the intake, and was going to vent it into a catch can- removed it as getting car mapped tomorrow, and didnt want that stuff getting in.

 

if your near cambridge way, i can have a look for u

 

Sure.

Well it's bound to be the intake's, now open, port that's causing idle issues, as it'll be affecting the measured air mass by the MAF... i.e. the MAF will have measured the air mass prior to the intake pipe, then some of this measured air is now escaping via that port, so the ECU will be overfuelling, causing your idling problem.

You need to get a metal or plastic bung of appropriate diameter to plug the now redundant port. I'd also use a jubilee clip around the port pipe to hold the bung in place as added insurance.

 

gents- appreciate the offers.

Joz- the intake pipe was properly blocked- Im not quite that dozy It was the pipe coming out of the engine that was open.

Short answer- its now reconnected and running well (well slowly until JGM arrives tomorrow)

Daone- offer much appreciated

 

Sorry. It wasn't mentioned in your post and it was the only thing I could think of as an explanation ... so I inevitably put 2 and 2 together.

 

dont you have to block the pcv valve or whatever it is called ? It is under the throttle body its a sort of bolt with the original breather pipe fitted

 

If you've blocked the intake port, then an open crankcase breather port shouldn't cause any issues (apart from a smell and oil all over your engine bay!).