Oil Pressure Warning on Auto Check System '91 200 TQ

[Joshua van Tol]

Actually, they're just simple switches. One for low engine speeds  
(below 2800 RPM) and one for high engine speeds. The high speed one  
has a higher switch point. They're very cheap, and they do go bad.


On Nov 14, 2006, at 7:37 PM, Grant Lenahan wrote:

>
> Its generally the sender unit.  Audi's system is partly fail-safe
> because it requires that two senders agree within a certain %. It is
> not uncommon for them to slowly go out of calibration.  in an
> unregulated system, the oil pressure varies with RPM, so they could be
> within spec at some RPMs and out at others.
>
> of course, you also might have no oil pressure. So check carefully.
> But I doubt it.
>
> Grant
> On Nov 14, 2006, at 7:34 PM, Abe Berman wrote:
>
>> My buddy and I set off from Burlington, VT in his silver 91 200tq on
>> Friday and drove both these cars back from Portland, ME on Saturday
>> through the white mountains, needless to say, lots of fun.  Can  
>> anyone
>> help with the question below?
>>
>> TIA,
>>
>> Abe Berman
>> 93 S4
>> 96 A4
>>
>> ---------- Forwarded message ----------
>> From: Keith Franchetti <skidfranc at gmail.com>
>> Date: Nov 14, 2006 5:22 PM
>> Subject: Oil Pressure Warning on Auto Check System '91 200 TQ
>> To: Abe Berman <yellowcuda at gmail.com>
>>
>>
>> Can anyone help with this?  Just picked up this great Pearl '91 200
>> TQ.  It's a killer great car, but the oil pressure warning on the
>> autocheck system comes on between 2k and 3k rpm.  Above about 2800,
>> it's on constantly, so on the highway at least it quits beeping.  But
>> around town its on and off constantly.  Previous owner said it's just
>> in instrument cluster gremlin, which I'm inclined to believe, as he
>> put 75k on the car and said it was a problem all along.  Also, I do
>> notice the oil pressure guage tends to run a little low, e.g. mid
>> range or lower when idling, and just above midrange when engine is
>> working or revving.  Could this be the pressure sender?  Anyone have
>> experience with this problem?  Thanks for any help.
>>
>> Keith Franchetti
>> Burlington, VT
>>
>> -- 
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