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Old 07-08-2013, 03:01 PM   #1
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PCV questions??

So i noticed my 2001 viggen was having low boost issues, so after a cel code for the DIC came up, I replaced it thinking this would cure the low boost, it did not.....so with some more research I found that if I take the top hose off of the PCV(I think this is the R hose not the W or the last hose on the bottom?)and plug it and the boost comes back, that it means it is a bad PCV.....WOW the boost was back and my viggen no longer felt like a toyota corolla, now here is my worry, is it ok to drive my viggen with that hose plugged, will I hurt anything and does this little trick of plugging the hose really mean the PCV is bad or does it need cleaned?? Thanks guys, sorry for all the stupid Ques. but I am really really trying to understand my viggen so i can do the work, I dont really trust any1 else to touch my dream! LOL
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Old 07-08-2013, 08:43 PM   #2
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That's not the PCV that you're taking hoses off of. That's the APC, the Automatic Performance Control. You should probably replace it so that your car runs properly, although some people disconnect it completely and use a manual boost control valve.
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Old 07-09-2013, 05:58 AM   #3
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Originally Posted by Jeremy R. View Post
That's not the PCV that you're taking hoses off of. That's the APC, the Automatic Performance Control. You should probably replace it so that your car runs properly, although some people disconnect it completely and use a manual boost control valve.
You can't run an MBC on T7 cars without it freaking out.

OP: As long as you're sure its the R hose, you can leave it unplugged forever.
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The only reason it took all day to install was because we couldn't keep our dicks out of each others mouths.
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Old 07-09-2013, 08:34 AM   #4
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Jeremy, I looked up the part on saabsite and it said PCV valve and the picture was of the exact same part that I took the hose off of, so I have no idea?

Saabeh, how do I know which one is the r hose, the middle hose does have a W on it, so is the R hose the top or bottom hose?

Thanks guys
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Old 07-09-2013, 08:38 AM   #5
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Originally Posted by viggentuff93 View Post
Jeremy, I looked up the part on saabsite and it said PCV valve and the picture was of the exact same part that I took the hose off of, so I have no idea?

Saabeh, how do I know which one is the r hose, the middle hose does have a W on it, so is the R hose the top or bottom hose?

Thanks guys
It doesn't say PCV on thesaabsite.

http://www.thesaabsite.com/93old/Saa...s.html#linkbar

The hoses are labeled on the valve.
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Old 07-09-2013, 02:13 PM   #6
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So I think I will just replace the BCV and APC(wherever that is) and be done with it
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Old 07-10-2013, 03:17 AM   #7
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This is what you want..55557331 Genuine Saab - Boost Control Valve - Free Shipping
APC is the old school name used back in the 900 days.
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Old 07-10-2013, 02:09 PM   #8
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This is what you want..55557331 Genuine Saab - Boost Control Valve - Free Shipping
APC is the old school name used back in the 900 days.
Thanks lms! I now know for sure that the BCV is bad because I disconnected the W line and I had boost, it even dipped into the red and hit the fuel cut off, of course that scared the shit out of me I have never experienced that b4....so I put the W hose back on and plugged up the R hose, that seems to give me more boost but does not dip in2 the red.....so I will prob drive it like that till I get the new BCV, should I b ok with keeping the R line plugged??
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Old 07-10-2013, 02:18 PM   #9
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Originally Posted by viggentuff93 View Post
Thanks lms! I now know for sure that the BCV is bad because I disconnected the W line and I had boost, it even dipped into the red and hit the fuel cut off, of course that scared the shit out of me I have never experienced that b4....so I put the W hose back on and plugged up the R hose, that seems to give me more boost but does not dip in2 the red.....so I will prob drive it like that till I get the new BCV, should I b ok with keeping the R line plugged??
Unplugging the w line does not prove the BCV is bad. T7 valves very rarely go bad. Plugging the R line is a very common and permanent mod. Just leave it plugged.
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