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Re: Boost/vacuum numbers...
While riding in my friend's '88 5000tq, I noticed that when he let up on
the throttle, the boost guage would go down to 0.1 bar; sometimes he
says that he can get to 0.0 bar on a long hill. In my '91 200tq20v,
I only get down to 0.4 bar (maybe 0.3 sometimes), but never that low.
0.0Bar is damn hard to produce in a laboratory. His gauge lies big time.
I typically see about 20InHg vacuum on decel, occasionally peaking in
the 25InHg region, on a fresh engine, all new hoses/etc, expensive and
Do I have a vacuum leak somewhere? No obvious driveability problems I
can see or feel. Any ideas of what to check for? Or is there no
I would think you should see well less than .4Bar, but if you average
out lying gauges/sensors, you get .2 bar, which is in the right range.
In a '91, your hoses shouldn't have rotted out yet (unless Audi has
switched to new high-tech accelerated-rotting hosing), so you're pro-
bably OK. If your idle is stable, and starting is not a problem, then
I wouldn't try to fix it, you'll only break something.