Update on loss of power/backfiring into the intake Audi 5000....

[Ameer Antar]

yes, this makes a lot of sense, b/c an o2 sensor becomes less and less
sensitive to oxygen as it ages. This makes the sensor output read richer and
richer, making the ecu compensate by leaning out the mixture. changing your
sensor should solve the problem, as long as the mixture setting was right to
begin with...BTW, burning oil and other soot leaves deposits on o2 sensors
which shorten their life a great deal...

-ameer

----- Original Message -----
> Message: 1
> From: "Stephen Ankney" <ankneys at hotmail.com>
> To: quattro at audifans.com
> Subject: Update on loss of power/backfiring into the intake Audi 5000....
> Date: Sat, 29 Dec 2001 03:49:14
>
> Listers,
> Spent a couple of more hours digging through the engine bay...
>
> Removed and checked intake boot for leaks/cracks. Found none. I also ran
th=
> e
> car at idle and wiggled all vacum hoses and intake boot to see if I could
> get the engine idle to change. Nothing...
>
> So I disconnected the O2 sensor leads to see what difference that made and
> the car runs darn near perfect! I now get the mandatory check engine light
> and O2 fault code but the car runs good. I think that my O2 sensor must
hav=
> e
> been pretty dead. I ran the car for about 20 minutes and it did not
stumble
> once with the O2 sensor disconnected...
>
> So here's my next questions: Is it OK to run the car for a few days around
> town with the O2 sensor disconnected? What would be the pitfalls of doing
> so? Bad gas mileage I'd assume...? Car running rich?
>
> Does it sound feasable for a dead O2 sensor to cause backfiring into the
> intake like so...?
>
> Thanks again everybody!
> Steve
> 88 5000S
> Michigan
>