[s-cars] Strange Boost Problem

[Bruce]

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Ugh, I hate emails with titles like this one.

I am having a weird issue. When flooring it through the gears, sometimes af=
ter a shift when getting back on the gas hard, the boost only goes to 8-10 =
lbs and the car feels slow as a result. Then, I keep my foot in it, and in =
three seconds or so, the gauge "pops" back up to 24 lbs and the car pulls h=
ard again.

No stumbling, missing, etc. Just not enough boost, and then it "unsticks" i=
tself somehow and goes back to normal.

I did get check engine light flashing once, and code was for hi/low fuel mi=
xture issue.

It feels like bad BPV, but I have tried two new ones, and both look OK. Cha=
nged injectors, ECU sw, and MAF (thank you Bob!), and same problem remains.

It only happens after I've come off the gas completely, and then get back o=
n, like after a shift or coming through a turn. When I floor it from highwa=
y speed while I am cruising and on partial throttle, no problem.

I'd say it happens 40% of the time when flooring it through the gears.

Thanks all, I am supposed to leave for Watkins Glen on Friday and am worrie=
d I won't track this one down in time.

Bruce
'93 S4, almost perfect (ha!)