[s-cars] Hesitation at 3,500 rpm WOT - bad BPV?

[Michael Wakefield]

That's the way my 1.8 coils started to go out. For some reason, mid rpm range would get a little rough when flogging, then be fine all the way to 7K+.
Mike Wakefield

On {May20}, at 8:11 PM, Nathan Belo wrote:

> Subject ur-S4 approx. 235K miles.  When I drive the speed limit at civilized
> speeds I have no issues, but when I want to be a hooligan and romp on the
> accelerator (WOT) I get a hesitation/flutter around 3,500-4,000rpm at gears
> 2, 3, 4 and the car bucks but smooths out after 4,000rpm.  I noticed it
> first during a track day going up hill in 2nd gear at ORP (Oregon Raceway
> Park) http://www.youtube.com/watch?v=fyvUS4zvf50 (not my video nor car)
> http://www.youtube.com/user/ProFormanceSchool#p/u/1/ESG2qY55TWQ
> 
> I have the stock digital boost gauge (1/1992) and it doesn’t seem I’m
> getting the peak boost I used to get?  About 1,000 miles ago cyl. 3’s Bosch
> F5DPOR sparkplug (with less than 2,000 miles on it) grenaded
> http://s242.photobucket.com/albums/ff107/belikeh20/Audi/?action=view&current
> =39af4d73.jpg  so I replaced all 5 plugs, which hasn’t changed anything.  I
> ran compression on cylinder 3 & it checked out fine.  I connected a VAG/VAS
> 1552 & nothing displayed.  I have the Samco (red) hoses except off the
> turbo.  I checked the moisture trap at the firewall & it’s connected.  I had
> somebody drive it that thought it felt like the turbo was going out.  Could
> it be when the spark plug grenaded and shot out it damaged the turbo?  This
> only happens at WOT, or could it be a boost leak or bad BPV?
> 
> BTW- I have the ‘92 sport springs for sale
> 
> -- 
> '05 Ducati Monster 1000S - ride naked!
> '92 Audi //S4 IA III+ w/S2 (CGR) 6-spd, 2B Stage 2 Big Reds, Samco (Red),
> 710N BPV, H&R Sport/Bilstein,Pearl/Ecru
> Nathan Belo
> Seattle, WA  98119
> 
> 
> "Brake later & open the throttle before normal"- Valentino Rossi
> 
> 
> 
> 
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