help boost problem!!!

went out for a run today up through cheviots with family today dropped a cog to go round a corner heard a bit off backfire louder than normaly and when a put toe down have seemed to lose boost pressure its completely standed wrx blob pressure was running at 14psi now it wont go past 6psi anyone had this problem before that might know what it could be cheers

Sounds like its gone into limp mode, most likely after picking up a touch of knock, get the ecu reset and read for codes.

Mine classic droped from 14psi down to 8psi once over which turned out to be the manual boost controller to blame. Unsure if you had one fitted but maybe worth checking

a tried one a while back but took it off due to not havin a fcd so car has been standard for some time what happens if there is a touch of knock is that bad???

also there has been no ecu light on at any time does anyone have a code reader to have a look please cheers

Prolonged knock is very bad for the engine, the knock sensor picks it up and adjusts the timing, if ithe ecu picks up more det or excessive boost pressure it puts the engine into limp mode to protect it from damage.

What fuel are you using?

Also have you filled up at a supermarket before you got this problem?

Usual cause is poor fuel quality.

i normaly just use shell unleaded but yesterday i used tesco and was out again today and did it again but was only in limp mode for about ten min

I have been running scoobies on Tesco momentum for 4 years and it has never caused me a problem. My first classic went into limp mode once it had no boost and put a rev limiter on at 4k rpm. That was caused by a faulty MAF sensor. Lack of boost can be caused by many things your best net is to get it checked out by a pro ASAP..

Also if its UK spec and as you say completely standard it should be ok running on 95 RON unleaded..

eye its standard well apart from cat back and panel filter gonna get it checked out cause its concernin me

well after i spent a bit cash on buying a code reader there was nothing come up so suppose that means i will never ever use tesco fuel again thank fook

natski redcar wrote:

Also if its UK spec and as you say completely standard it should be ok running on 95 RON unleaded..

You wouldn't say that if you had a knocklink fitted

Mine lit up like a xmas tree on 95 and a standard map.

it just one of those things i never thought it would of caused problems with bein standard

yep, its a fact, Subaru's just don't like cheap fuel unfortunately.