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

Huw Powell audi at mediaone.net
Sat Dec 29 14:48:43 EST 2001


> By the way, what would be the proper way to confirm that the timing is in
> specs without any fancy equipment?(read: shadetree mechanic/lack of tools)

You can probably get close by lining up all the markings at TDC - back
of cam pulley, flywheel in window, and distributor.  if you can find the
markings, of course.  You may have to find the cam/crank setup, then
turn the engine to whatver position equals your stock static advance and
then check the dist?

> Spent a couple of more hours digging through the engine bay...

> 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 have
> 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?

Probably no worse than running with a bad one - it's probably been
telling your engine that it is either too lean or too rich the whole
time it is warm, and then the ecu tries to compensate as far as it can
(via the DPR...) and actually makes it too much of the opposite the OXS
was saying.

> Does it sound feasable for a dead O2 sensor to cause backfiring into the
> intake like so...?

sure, it could, I suppose...

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/



More information about the quattro mailing list