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1985-1998 [Subscribe to Daily Digest] |
... this problem can drive you insane...
and the best way to eliminate the BPC as the main cause is to buy a new one for $200, IF you don't have anyone you can borrow their known working BPC from.
I went through TWO used BPC's that worked worse than my origional BPC did, which was almost half the cost spent on those two than buying a $200 new one would have cost me.
Once i got the new one from eeuroparts, and pluggged it in, my problem was solved.
of course, i had checked everything else by that point, just as you had, and i knew that everything else in the car was working.
My car is a 1990, so by then my BPC was 14 years old. Time for a replacement.
My new one worked great, although it buzzes sometimes, but this is because of the engine modifications i've done.
DO a search of my previous posts for my method on testing the BPC solenoid for proper operation. the thread is called something like "my non-pantented BPC test procedure" or something like that.
When you read through it, it'll tell you how to manually test the BPC for ELECTRICAL operation, and give you an idea of wether it's working correctly. I'm not going to say my method is fool-proof, and i've had a suggestion that it isn't a perfect test, but i'll tell you in a second if you'r bpc is truly NOT working...
...you might test it and conclude that you rbpc IS working however, and it might just not be working WELL...
I'll give you a breif rundown of how the BPC works:
your turbo compressor housing runs a hose to the top line of the solenoid.
this runs pressurized air into the solenoid...
then the electromagnetic disc on the inside of the solenoid directs the pressurized airflow into either the Wastegate, OR the intake boot, right before the turbo.
When the air is directed into the Wastegate, this causes baseboost...
because the wastegate actuator is being PUSHED open by the pressurized air from the compressor housing.
however if the air is directed to the R hose, the bottom connection, the wastegate isn't being blown open... and thus you have FULL BOOST.
I've been told that the W hose WILL RECEIVE SOME AIR PRESSURE from the compressor, EVEN IF THE AIR IS BEING ROUTED TO THE R connection...
...however, this isn't enough air pressure to blow the wastegate into an open position IF YOUR WASTEGATE ROD IS ADJUSTED CORRECTLY!!!
that's another thing to check... the mechanical adjustment of the wastegate rod...
so...
the electrical test will walk you through the two positiions of the BPC solenoid.
air routed from C -> W
and air routed from C -> R
in the C -> W situation, when you blow into the c line the air should come out of the W connection, and not the R...
and when you blow into the C line for C -> R, a LITTLE bit of air should come out of W, but not much, the majority should come out of the R hose...
go read my post about the procedure, and this will all make more sense to you...
...i'm writing this here in this post because it's sort of a revision to my original post.
Let me know if you have any questions...
-gavin
posted by 69.168.104...
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