[V8] Excessive Oil and Emission Pressure

[Dave Saad]

Your motor can burn oil for any reason any other motor can, and a few  
extras as well!

My '91 had a symptom where it would smoke really bad on a long hill  
descent with the throttle closed.  So bad that it would kill the  
engine if I just pushed in the clutch at the bottom of the hill  
without revving the motor to clear the oil out of the cylinders.  The  
solution was to replace the rings.  Apparently some of the earlier 3.6  
motors came from the factory with less than optimal rings in them.   
Mine was burning more than a quart per 1000 miles with about 80K on  
the odometer.  I finally replaced the rings at about 150K miles.  I  
found the cylinders to be within wear limits, but valve guides needed  
replacing.  Having done both of those things now, I no longer burn oil  
and the motor is strong.
If you choose to go this route, you will not be able to replace main  
or rod bearings - so don't remove the crank and be very careful with  
the rod bearings.  You can replace the stretch type rod bolts and head  
bolts.  All other gaskets and parts necessary for a valve job are  
readily available.  I think if you really wanted to, you could do this  
with the engine in the car by removing the subframe.  I chose to pull  
the motor.

Dave


On Sep 22, 2009, at 11:45 AM, <bw at UDel.Edu> <bw at UDel.Edu> wrote:

> Hi, I am new to the list, but have been working on my 3 V8s '93s and  
> '92 over
> the years, so I believe that only one O2 sensor is necessary in 4.2 V8
> automatics, or let me know more!
>      My Pressure concern is like another member wrote "when you jump  
> on it, can
> smoke quite a bit....then other times it seems fine." I have a fine  
> '93 V8 that
> pegs its oil pressure gauge when started and sends heated oil out of  
> the hood
> when raced about and stopped with strong braking. I don't believe  
> the oil is
> being combusted, but leaked at high pressure on to the exaust. I've  
> replaced
> valve cover gaskets and distributor O rings etc. It may be the oil  
> pan gaskets,
> my next "improvement" . But, is there an oil pressure regulator of  
> any sort?
>      I also notice a high pitched whine coming from the fuel cap  
> after stopping
> the car. The mysterious carbon canister and its solenoid valve seem  
> to be
> suspect. Since I am new to the list, can I search the archives by  
> key word or by
> date only? Does anyone know why the pressure is building up either  
> of the two
> systems in an otherwise functioning Audi.  Thanks, Bob Williams -  
> Delaware -
> I will be selling a V8 and have an Audi 100 front end and parts you  
> may need.
>
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