[s-cars] Please Help - Car bucking under WOT

[Paul Friedenberg]

Boost leak? Bad MAF?






>From: "Scott Munger" <mungerts at uneedspeed.net>
>Reply-To: <mungerts at uneedspeed.net>
>To: "'S-Car List'" <s-car-list at audifans.com>
>Subject: [s-cars] Please Help - Car bucking under WOT
>Date: Mon, 11 Nov 2002 22:16:39 -0700
>
>
>While the image of a bucking car is humorous, I'm not laughing :-(
>
>My wife and I took the S car to Vegas yesterday.  We live in Flagstaff
>(7300
>ft, 42 degrees))... after about 2 hours on the interstate under moderate,
>with stints to max (80-120mph), boost we come into Kingman (< 4000ft 68
>degrees) for a pit stop (I ran minimal boost and light footed for about 5
>minutes before pulling into a stop), turn off the car, bathroom break, back
>into the car and start it up.   Heading up a fairly steep grade in 4th, I
>get excited about the sound of the turbo on the concrete dividing wall and
>ask my wife to "listen to this"... I depress to WOT and the turbo spins,
>wooshes, then the car horribly thrashes as if I've stalled the car and
>tapped the brakes (heavily).   It feels like the engine is being cut off
>abrubtly by the ECU in response to boost... but I've no idea.  I test it a
>few more times and can repeat the behavior.  Ugh, I'm sorely disappointed
>:-(  The car seems to be running well other than when at heavy throttle.
>
>I gingerly drive the remaining 100 miles with no problems, yet never get on
>the accelerator (no need to be stranded in the desert).  On the return
>trip,
>today, I test the same procedure to no avail, although it seems like boost
>isn't kicking in that much... the car feels much slower at WOT.  The whole
>trip home I drove with a reasonable degree of light footed ness, then once
>I
>was closer to home, tried to reproduce the problem... no problems, yet
>boost
>still isn't kickin' me in the butt.
>
>
>Any insight into this problem is greatly appreciated.  Is it an electrical
>cutout by the ECU?  Perhaps detonation and subsequent adaptation by the
>ECU?
>I've never had a problem like this.
>
>--Scott Munger
>'93 S4
>
>
>
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