Avant died and reborn again...
pjrose at frontiernet.net
Sat Mar 6 19:59:23 EST 2004
At 1:27 PM -0800 3/6/04, Bernie Benz wrote:
>Phil, I'm not sure that I buy your suggested reason for stall after sudden
>throttle closure under boost with a failed closed BPV. The throttle plate
>is a pressure balanced valve, i.e. equal plate area on either side of the
>throttle shaft center line, thus it's position is unaffected by differing
>pressure drops across the valve. More likely IMO, just that the ECU is not
>programmed to control idle in a timely manner, while the ISV is still
>subject to boost pressure.
You suggest that the stall is a "lean-out" situation caused by
excessive (boost-derived) air being passed through the ISV? You could
be right; I was just stating what I thought I'd read to be the
"official" reasoning. I'll accept your explanation unless someone has
evidence or better reasoning to the contrary.
>If this throttle body had a throttle air bypass
>adjustment aka the 7A, this problem could be adjusted out.
What is that?
mailto:pjrose at frontiernet.net
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