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Posted by Alain(Luxembourg) (more from Alain(Luxembourg)) on Mon, 18 Mar 2002 01:59:50 Share Post by Email
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This WE I hook the pressure gauge in the line from BPC valve to the wsategate, just to see what goes on there during my boost fluctuation phase (Thanks for the hint Tapani !!). Well, the reason of my fluctuation is the BPC valve (boost low, line pressure high; line pressure low, boost high and so on). The pressure level in the line during that phase is oscillating between 0.2 and 0.3 bar. So now that I know the boost fluctuations are BPC valve driven, again the old question : why does the BPC valve do this ??? Again I noticed the fluctuation starts as soon as the needle touches 2500 rpm and stops as it touches 3000 !!
I also had quite noticeable missing at +/-2000rpm at light throttle, but this happens from time to time, usually with cold engine but also (less often) with warm engine. This also happens with a different DI cassette !!??

If I only could find a known good ECU to swap......

Alain

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