only half boost under load - will not spool fully

[1995NG900S]

Hello All,

I did my best to try and find an existing or old thread to answer this question but to no avail...so...I have sold my 1995 900s and finally got a turbo jet- 2004 9-3 linear

the person I bought it from said that it would never spool up fully and the gauge would never go past the "o" on the turbo gauge. He was right. I though i could replace the Boost control solenoid and that would fix it....WRONG..it will still not go past 3/4 boost.

I checked the air intake, the fan fuse, and still no dice..HELP!

[smut]

When you say 3/4 boost what do you mean or how do you know its 3/4 boost?

[1995NG900S]

I feel like it is not getting full boost under load b/c

- the gauge never gets close to the orange ( could be broken though)
- You never hear the turbo (i have never owned a turbo saab so maybe you are not supposed to be able to hear it?)
- it has the same performance as my last car NG900s 2.3 na.
- I figured that a 2004 with a 100k and a turbo should be able to take on the on-ramps better than a NA 900s with 175K

I really do not think it is the gauge
- the shop down the street hooked it up to their computer and they said it was the BCS, which i replaced but that did not do squat.

[smut]

Have you recycled the ECU ,you may be running on base boost?

[1995NG900S]

The car is bone stock - no modifications ever

I am thinking that it may be a blocked check valve or loose hose

The gauge will also not go all the way down to read zero boost either - is that normal? it stays at like 1/4 boost than eventually goes up to 2/3 or 3/4 bosst but never into the orange

[1995NG900S]

So I disconnected the battery and buffed my terminals and it was like I had a new car!!.....full boost and better throttle response....for about an hour than the check engine light came on and it was back to granny mode.....WTF?

I think their might be a vacuum leak or something

[aerojon]

get the code/s read then post them up,otherwise were just guessing..

[1995NG900S]

I tried to link my OBD2 code reader up and it said linking error...I tried to run it with the car on, car off, key in the on position but car not fully, and it still said linking error....is there a specific software update that i would need to download for it to work?

[aerojon]

is your reader canbus enabled/compatible..

[genman]

is your car not the older OBD system....so the reader needs to match.
could be a sticky wastegate valve not allowing the boost to be controlled properly.

[aerojon]

Originally Posted by 1995NG900S

I have sold my 1995 900s and finally got a turbo jet- 2004 9-3 linear

Originally Posted by genman

is your car not the older OBD system....so the reader needs to match.
could be a sticky wastegate valve not allowing the boost to be controlled properly.

Sent from Sinclair Spectrum 48k..

[1995NG900S]

So I went to advanced auto who reads code for free -- my actron 135 code reader just did not want to co-operate..and yes the car is OBD2 - and car made after 1996 is required by law to be obd2
anywhooo...its spit out the code P0033 - Bypass valve control circuit open

so the boost bypass control valve is broken which is the exact part as the boost control solenoid..same part # and everything..

Im getting a new one from http://www.goldwingsaabparts.com/

ill let you all know how it goes...unless you think there might be a deeper problem

[1995NG900S]

******did not proof read that last post and I kinda sound like precocious d#ck..appologies

[1995NG900S]

I replaced both the Turbo Bypass Control Valve and the Boost Pressure Control Valve, had the code cleared and the check engine light still came back on with the same error.

Any suggestions?

[ItsALoveHateThing]

Im having the exact same problem with my 04 9-3 Aero, except my car is not throwing any cel lights. Please update if you find a fix, and I will do the same!

[BadBrains]

Originally Posted by 1995NG900S

code P0033 - Bypass valve control circuit open

This could be a problem in the wiring itself, not necessarily the part at fault. Be sure the connector terminals are clean and have the circuit tested for continuity. Open circuit is usually due to a bad connection or broken wire.

[ItsALoveHateThing]

So, even though my car didnt throw a cel, i plugged in the obd2 reader and it read code p0244. So i checked the boost control cyliniod? And cleaned the plug the put it back on very snug and now the car is fully boosting again. Ill update again if anything changes!