Karl_mac_

Hi all,

Went to finally collect my Scoob tonight. I test drove it a few weeks ago and it was faultless, its been parked up and not used for at least three weeks and when I drove it home this happened everytime it came on boost.

http://youtu.be/fZelF5AYz7A


Boost gauge goes all way round and alarm tone sounds.

Its an 02 bug STI PPP on 53000 miles.

Going to drive it again tomorrow to see if it clears. Car drives fine off boost.

RS_Matt

Check vac hoses that connect to the turbo and actuator.

corno

What is it you actually check for, loose/frail cables? My 06 hawk reads that it boosts to 1.2bar but it's on a standard map..

piehole1983

iTrader: (7)

Check for loose, cracked, damaged vacuum hoses. Was the same thing that happened when I picked my car up.

Karl_mac_

Took it for another shakedown this morning. Boosts to around 1.2 bar now but still getting warning tone/light.

Will check vacuum hose. Thanks guys.

corno

Even with the car overboosting, will it pull like normal? or at least feel like it?
Karl let us know how you get on.

piehole1983

iTrader: (7)

It will pull far harder than normal because of the raised boost levels. Standard boost would be about 0.9bar or so depending on model.

corno

Makes sense! So in effect it's almost working like a manual boost controller.. more boost but no change on the map, can't be healthy or will the ecu adjust to it?

piehole1983

iTrader: (7)

It wouldn't be ideal, if it was a small increase it might be ok but any large increases in boost would lead to detonation and a new engine

corno

Just the news you want to hear for a ej25..

piehole1983

iTrader: (7)

You've nothing to worry about if your car has been set up properly I guess. Someone had installed a manual boost controller (as well as having old cracked vacuum lines) to my car before I bought it. I was seeing boost up to 1.6bar at times. It had also had a new crank, rods and pistons too. Says it all really! I removed it immediately to get boost back to normal until I installed ESL. Better safe than sorry!

Karl_mac_

Just had a thought. The car seems tombe driving normally and there were no problems before it was parked up - could it be the defi controller gauge playing up?

corno

Karl I'm sorry to invade your post.

So my car (06 hawk sti) over boosts to 1.2bar. It's on a standard map.

The car on Tickover sits at -24in/Hg vacuum. The workshop manual states that idle vacuum pressure should be less than -17.72in/Hg. So I guess this goes in hand with that somewhere a hose is damaged? I have no idea what I'm looking for truthfully..

piehole1983

iTrader: (7)

Like you say, the manual says below -17.72 and yours is. I don't think it's an issue really. The overboost however could also be old dodgy hoses too.

RS_Matt

Overboost on a car you've just picked up could also because previous owner crushed the pill or put a smaller one in to the vac pipe that come off the turbo leading to the t-piece..

Karl_mac_

Well this is embarrassing.

Turns out the warning light on the defi was set to 1 bar and the rattle is a sheared bolt on the exhaust heatshield.

Car is all sorted and going to scooby clinic next sunday.