At the last MOT my 2.5 wrx Hawkeye was right on the limits of emmisions.

Over the past couple hundred miles on acceleration I have started to notice a bit of a stutter /Mis fire.

Searching the forums and Internet I started to narrow this down to the symptoms of a failing front Lambda sensor.

Saturday night whilst just phaffing and generally looking and listening to the engine ( as you do) I could hear a hissing from around the take off point the previous owner had had the boost gauge plumbed in. I whipped of the pipe and replace it and the hissing stopped.

Yesterday I ran to Wales and back... 350 mile round trip, and the stutter was gone.

So will this have helped with the emissions too?

A lot cheaper than a lambda sensor

At the same time I did notice oil in the breather pipes , not vast amounts but enough to notice, is there a benefit to a catch can?.

Always great full for you views and comments.

( Tubby it's not the head gasket ......... Yet)

Cheers
Paul

 

Vac leaks will affect the running of the car yeah.

 

would make it run rich due to overfueling with boost leak, least youve found the route of the problem now lol

 

ringland failure.........


yup a catch can will help, I plumbed one in when I fitted a fmic and there is nothing in the pipes now.

 

**** it.... Forgot that one.....

Glad you are around to pick me up on my failing, and your guidance is always appreciated.