lads,

recently the car, 1994 wrx import auto, has been running very variable boost. Normally was running about 0.9 bar, however it now seems to be running about 0.45 bar and watching the boost guage, it seems to reach the 0.45 very jerky. It then sometimes runs 0.9 then others 0.8 etc but when there is a problem its 0.45bar.

I have taken the boost solenoid from its holder and done the squirt of wd40 thru it but to no avail. there seems no reasons as to why it chooses one time to 0.95 and others 0.45.

any ideas or hints or help wud be greatly apprecaited!


cheers

 

I have a very similar problem

sometimes I get full boost at my 97 wrx import flys

but then very random, it sometimes holds back and only gives me what feels like only 1/2 the boost

no idea whats going on, but I need a cure asap

 

Try Dawes to control boost.

Just don't go crazy with it

 

I had the same thing and I spent £££ on new ecu, coil packs, O2 sensor, vacuum pipes, solonoid etc.
It would run at 0.8bar then for about 30mins it would stick at 0.5bar then suddenly 0.8 again randomly????

cured with a £5 bleed valve

Blank off the top and middle subaru vacuum pipes from the solonoid leaving the bottom one that goes into the air chamber thingy, connect the MBC from the actuator to the turbo comressor ( little pipe from top on turbo) set for whatever your usual max is eg: 0.8bar.

it cured mine

 

I had this prob a while back on my00 it turned out to be the maff, my symptons was.
1 misfire on hard driving only
2 unstedy idle
3 low boost after engine fully warmed up

hope this helps

 

i have the exact same problem.when i bought it,it would only boost at 0.5 bar.i reset the ecu and got 0.9 bar for 10 minutes at which point it went back to 0.5 bar and my engine check light continuosly flashes.drove again and got 0.9 bar for 5 minutes and went back to 0.5 bar again.
its driving me nuts.

 

just bought this to see if it will help but i will set it at 1.0 bar eBay.co.uk: Boost Controller Bleed Valve Grainger Dawes Device (item 110137484508 end time 20-Jun-07 22:59:59 BST)

 

Be Careful...

The ECU can limit boost to 0.5bar (approx) if it has a MAF fault. This won't always throw a CEL and the car will be running lean.
Increasing the boost manually could be the end of your engine....If cleaning or replacing the boost control solenoid does not fix it, then get the AFR checked before you jump to conclusions.

 

found a radiator hose loose today.changed the jubilee clip and have had 0.9 bar all day.