Date: Thu, 20 May 2004 14:36:09 -0600 From: "Zon" <johnnospamy-to-group.please> Subject: Follow-Up: my boost problem seems to be temperature related ...
I've been posting to this newsgroup about my intermittent boost problem and you have helped me to limit possible causes to BPC valve or it's control. Car is '99 9-3 FPT (185hp) I'm reluctant to invest $200-250 in a part that may be functioning perfectly, so I haven't purchased new BPC valve yet. However, I have had enough time to develop a feeling that the lack of the boost is actually temperature related. It seems that when I drive engine hot It starts to lack the boost. When engine bay get's extremely hot, I loose all of the boost. Hotter the engine bay, lousier the boost. When I let it cool down in shadow for several hours, it works more or less fine again. Hot days seem to be worse than cool days. The worst day was when I drove engine hot, parked it under the prairie sun for 4 hours, and when it was time to go home I let it idle w/ A/C on for 5-10minutes to cool down interior while I was collecting my stuff. When I headed back home, I had no boost whatsoever. So, now I'm thinking it is temperature related, and probably it is engine bay temperature that counts. When the problem appears, everything under the hood is hot, even BPC-valve almost burns my fingers. When I disconnect wastegate hose from BPC-valve, I get the boost back. Can BPC-valve malfunction in such a manner that when it becomes hot, it becomes sticky and leaks pressure to wastegate actuator? Or could one of the sensors start malfunctioning when hot, thus mislead engine electronics to think there is too much boost? I haven't taken it to dealer yet, since the problem is intermittent. With my luck, it does not appear when it is there, so they make a guess, charge me couple of hundred dollars, send me home, and next day I find nothing has changed. Been there done that. BR:Z
 |
 |
 |
 |
 |
