410 replies to this topic

[LukeFranky]

Should I be able to blow through this line (the one my finger is on) if all the other hoses are blocked?

It appears I can blow through it and the air comes out the top of the device. I can't blow through the other hose that attaches on the bottom.

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[natho]

some of the solenoids expose one of the lines to atmospheric pressure when they are "off" - i'm pretty sure that's normal.

 

i connected the ecv positive pressure solenoid the wrong way once and it caused some funny behaviour - the ECV would remain open if you changed gear during pre-spool, but it would work normally if you revved it out far enough to switch completely.

[LukeFranky]

I've recon'd the BBOD. Car is boosting more smoothly but was still surging. I know I got the hoses inside the box set back up right but I'm going to double check the lines on the outside are going the right ports.

[duncanm]

some of the solenoids expose one of the lines to atmospheric pressure when they are "off" - i'm pretty sure that's normal.

 

i connected the ecv positive pressure solenoid the wrong way once and it caused some funny behaviour - the ECV would remain open if you changed gear during pre-spool, but it would work normally if you revved it out far enough to switch completely.

 

According to this, http://www.subyclub....-to-twin-turbo/, that's the ECV negative pressure solenoid.

 

There's a better picture here: http://www.subyclub....ue/#entry255036, which shows that line 6 is open to atmo when 'off'.

[LukeFranky]

All vacuum lines are replaced now, inside the BBoD and outside. I cleaned all the sensors in the BBoD too. Rechecked the line mapping. No change since my last post. A bit smoother but still surging.

Threw another cam shaft sensor code last night with the lights on and the whole car missed a beat at one stage and really lurched. I had already checked voltage previously but decided to check again...

Running on the road I get betweem 13.9 and 14.4 volts. At idle it drops below 12 volts. Could this be my problem all along?

P.S. I read the voltage from the live data option on my code scanner.

[natho]

 

According to this, http://www.subyclub....-to-twin-turbo/, that's the ECV negative pressure solenoid.

 

There's a better picture here: http://www.subyclub....ue/#entry255036, which shows that line 6 is open to atmo when 'off'.

 

it was definitely the positive pressure solenoid. check the diagram again - that also shows both solenoids have a port open to atmospheric pressure.

All vacuum lines are replaced now, inside the BBoD and outside. I cleaned all the sensors in the BBoD too. Rechecked the line mapping. No change since my last post. A bit smoother but still surging.

Threw another cam shaft sensor code last night with the lights on and the whole car missed a beat at one stage and really lurched. I had already checked voltage previously but decided to check again...

Running on the road I get betweem 13.9 and 14.4 volts. At idle it drops below 12 volts. Could this be my problem all along?

P.S. I read the voltage from the live data option on my code scanner.

 

are you sure the tune is stock?

do you have the ability to do some data logging? it'd be interesting to see at what point you have problems - sounds like only when the ECV positive pressure is engaged (which is quite early on with a stock tune).

[LukeFranky]

I can't do data logging yet, but when my VAG cable turns up I might see what I can get out of it.

[LukeFranky]

Oh, and I don't think it is a stock tune. It has an ecuTek badge.

[duncanm]

could it also be the ECU seeing knock and opening the SPRV in 'low octane' mode ?  Not sure how that's triggered.

 

ecuTek --- run away!

[LukeFranky]

So if it was the knock sensor, wouldn't it be throwing code?

As for ecuTek - yeah, I've heard it is crap.

[duncanm]

yeh - you'd expect it'd throw a code if it wasn't happy... but seeing the timing adjust numbers (IAM and fine knock) would be best.  

[allpaw4]

Low voltage (12.5ish) at idle is perfectly normal. Alternator needs rpm to up the voltage. You'll find the voltage increases between idle (12ish) and about 1300 - 1500rpm (14ish).

[LukeFranky]

So if the voltage is getting below 12v do I have a problem? That's when my cam shaft sensor plays up.

[duncanm]

stepping back a bit - -have you thought about aluminium brazing that manifold to fix the cracks... something like 'durafix' repair rods.

[LukeFranky]

I replaced the manifold.

[LukeFranky]

I went a bit crazy with the upper engine cleaner today and now my car won't boost over 3 psi?

Hoping the spray just needs to work its way out of the system. I used an after-market brand as the Subaru stuff is hard to come by in this town. I won't have damaged anything with it would I?

[LukeFranky]

Sprayed lots of it down the vacuum lines near the BBoD and other sensors. Bad idea?

[natho]

is the vacuum line to the BBOD plugged in? sounds like what happened to mine when i left it unplugged after cleaning the BBOD. should be able to see it between BBOD and airbox without removing anything.

[LukeFranky]

It's plugged in and under vacuum, however there is no vacuum getting through to line 1 going to the actuator under the intercooler.