Date: Wed, 12 May 2004 13:20:04 -0600 From: "Zon" <johnnospamy-to-group.please> Subject: Re: Where to buy BPC-valve / APC -valve?
"Fred W." <Fred.Willsnospampam myrealbox.com> wrote in message news:P42dnZGtJfsH-j_dRVn-ignospamphia.com... > > Ah, OK. This is the less usual failure mode then. Usually the failure is > that you never get full boost, you get base boost only. In your situation > you are getting a failure to limit the boost. Yeah, I get some boost, somedays better some days worse, but never full boost. On one day there was no boost at all (base boost I guess). But when I unplug W-hose, I get all I wanted and more! Of course, I don't dare to drive it like that all the time. > What happens if you unplug the APC solenoid? Does it then drop to base > boost? If so, you still have a control problem. Haven't dared to try that since some people say I get 'check engine' light and I have to visit dealer to clear that. But I guess I have to try it... > If you still get max boost and hit the pressure limit switch the problem is > that the wastegate is not being operated. You'll want to see if you can > manually move the wastegate. Then try moving it by pressurizing the W hose > with a pump of some kind. Also, check that you have pressure coming out of > the W port on the APC valve with it unplugged. OK, I'll try unpluggin APC valve when the problem gets worse again. Now its quite ok. But it seems to come back ... What comes to the operation of wastegate I made this simple tool: I cut the valve stem from bicycle tube. That fits well into wastegate hose and let's me build up some pressure on wastegate actuator. I pumped air in there with a bicycle pump, which has a pressure gauge and I noticed I need like 0.5bar to wastegate rod start moving. Accuracy of the gauge is poor, but at least I saw that pressure makes wastegate rod move. I believe that part is ok. I also checked bypass valve, and it does not seem to leak. BTW; whatever I do with APC valve, touching it always fixes the problem for short period of time (not like days anyway, more like 10-15minutes or so). Then the problem comes back and somedays it is worse, somedays it is better, but unplgging W-hose brings all the boost back. When I play with APC-valve and it starts to work, everything seems ok: smaller boost on first gear (it's manual) and boost goes down a little on high rpms. But then it starts faiing again... Someone gave me a tip that some CRC or WD-40 may work as a first aid. I did that, and it works now, but that may be just coincidence. BTW; I haven't made up my mind yet if ambient temperature has something to do with the problem, but I have a feeling it is worse on hot days. Cannot be sure thought. Car also seems to work better when engine is not all hot, but that is also something difficult to tell for sure since I hate to push it hard when engine is cold. BR:Z
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