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

[chris chambers]

Nathan,

It sounds like the exact same issue I had for about a year until it finally 
popped code 2224 and I found my answer.
Essentially your ECU is being tricked believing you are overboosting, and wen 
that happens it momentarialy shuts off the fuel pump.
I bet you either have a boost leak, defective MAF or dirty MAF connections at 
the cable

Read here: http://www.sjmautotechnik.com/trouble_shooting/20vboost.html#oboost

HTH
Chris






________________________________
From: Nathan Belo <nathan at license2sell.com>
To: S List <s-car-list at audifans.com>
Sent: Fri, May 20, 2011 10:11:21 PM
Subject: [s-cars] Hesitation at 3,500 rpm WOT - bad BPV?

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 doesn¹t seem I¹m
getting the peak boost I used to get?  About 1,000 miles ago cyl. 3¹s 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 hasn¹t 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 & it¹s 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 Œ92 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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