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Boost Pressure Control Valve (?) Posted by Peter [Email] ![]() ![]() ![]() In Reply to: Mid boost problem, in NC, Thu, 6 Jan 2005 17:41:51 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Some component used in regulating the boost may not be working correctly. (cracked vacuum line, bad boost control valve, loose connection...)
The following may or may not apply to your car, depending on what you mean by "surge".
I had reduced power during mid-boost and car appeared to surge or nearly stall during hard acceleration in 3-5th gear. Problem was intermittent but graduallly got worse, but only during hard acceleration. Repaired a hole in the plastic end tank of the stock intercooler and a couple cracked vacuum hoses. Boost and power improved, but the "surging" and fuel cuts during acceleration actually got more pronounced (because the boost was now getting to the edge of the red zone).
The turbo was actually going into overboost, and the ECU was cutting the fuel (which it is supposed to do to protect the engine). It turned out to be a sticking 'boost pressure control valve' (p/n 7485576) located on the passenger side near the air intake (see pic below). Mechanic was able to get it to work by blowing compressed air through it and cleaning it. A new part is about $200.
This is the post that gave me an idea what to look for in solving my own problem, or search for BPC on this board.
posted by 69.212.64...
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