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Old 10-24-2012, 03:08 PM   #1
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Viggen boost issues

I know there are a lot of threads on this but I've spent quite a while trying to find answers and tried many things with no success. I have a 2000 viggen and it makes lackluster boost. Very mild torque steer and its hard to outrun an Avalon. Sad. Ok, so I bought a new BPC a few weeks back hoping that would resolve the problem. Plugged the check valve hose and got better boost but still not the good stuff. So today I undid the W hose. Loads of boost and fuel cut! From what I've been reading it seems people say that means the BPC is bad, however my BPC is brand new. Also a lot of conflicting info on how the BPC should react when testing. All my vacuum hoses are good btw. Any ideas? I would really like to get this thing running properly.
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Old 10-24-2012, 03:36 PM   #2
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How many miles? What spark plugs and how old? How old is the MAF?
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Old 10-24-2012, 04:31 PM   #3
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How did you "test" the new BPC... hopefully not by applying 12v ?
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Old 10-24-2012, 07:57 PM   #4
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180,000 miles. Fairly new plugs and DI Cassette. I've tried disconnecting the MAF to see if there would be a difference, but that did not really make a difference. By testing BPC I mean disconnecting W line and also comparing it to the old one. The old one stuck at something close to base boost, about halfway into the yellow on the meter. New one gets me about 3/4 into yellow. Removing the w line sends the needle halfway into red, followed by a startling fuel cut.
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Old 10-24-2012, 07:58 PM   #5
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And the Plugs are NGK resistors of some type. Can't remember the exact ones, but I did my research before going out and buying.
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Old 10-24-2012, 09:24 PM   #6
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Clean the MAF, check for boost leaks.
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Old 10-24-2012, 10:00 PM   #7
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Unplug the R line to the BPC and plug the line with a bolt or something. Then test.
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Old 10-25-2012, 06:57 AM   #8
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Yup do what dan-the-kid says, then clean the MAF with the appropriate cleaner from an auto parts store. Then, unplug your battery for a bit. Then go out on the highway and do a bunch of full 4th gear pulls.
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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 10-25-2012, 07:25 AM   #9
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I cleaned the maf and plugged the R line a couple weeks ago No difference. I suppose it could be a leak, however it was having no problem blasting into the red when w was removed. like I stated before, all my vacuum lines are new, but there is a bushing on the intake manifold that feeds the brake booster. that thing seems very suspect. the hose seems too easy to pull out and the whole thing is loose-ish and just seems wrong. All though I don't really have a good one to compare it with. In the meantime I think ill try and hook a fogger and bike pump up to my plumbing and see if anything comes out.
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Old 10-25-2012, 07:34 AM   #10
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Honestly if its bone stock, 3/4 the yellow is pretty normal.
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Old 10-25-2012, 07:37 AM   #11
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Where are you located?
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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 10-25-2012, 08:39 AM   #12
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3/4 into yellow is below what it use to hit. When I first got the car several years ago it had no problem dipping just a bit into red. I've been dealing with reduced boost for several years, and it just keeps getting worse Like I said, it hardly torque steers. Saabeh, I live in Atlanta. It's still pretty warm here, so technically it should blow harder than when it gets chilly. It's just a constant mediocre pull. Maybe if I remove the floorboard I can Flintstone it just to get that extra pull.
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Old 10-25-2012, 08:41 AM   #13
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I know its not right, because it use to be able to break loose good tires in 2nd. Only chance of that happening now is by driving on a gravel road and mashing it.
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