overheating 4000q

[George Nimmer]

I checked the timing today, and it's at about 6 degrees @ idle (Bentley
says it should be 6 degrees + or - 2), and at about 40 degrees @ 3500
rpm.

My Bentley manual says to look on page 28.40, however 28.37 is the last
page in the ignition chapter!  Guess my book has a printing error?

Any idea how I reduce the amount of advance?

Thanks


On Wed, 2002-09-11 at 12:46, Bruce Bell wrote:
> 87 is correct for the thermostat. Did you replace everything, radiator etc.,
> because of the overheating problem? You said you flushed the system after
> all the replacements. Did you suspect some of the parts? Could the radiator,
> if used, have some blocked cores?
>
> My first thought is you are running a bit lean (creates extra heat). Check
> injectors system and control pressure. It also wouldn't hurt to make sure
> you aren't running too much ignition advance. Set it at the factory spec 8
> degrees or better yet make sure you aren't running more than 34-36 degrees
> total advance. It would be interesting to see the plug colors after one of
> these overheating runs.
>
> Good luck
>
> Bruce
> 98 A4 2.8qm 70,000
> 87 4kq 300,000
> 84 quattro 50,0000
>
> -----Original Message-----
> From: quattro-admin at audifans.com [mailto:quattro-admin at audifans.com]On
> Behalf Of George Nimmer
> Sent: Tuesday, September 10, 2002 10:37 PM
> To: quattro at audifans.com
> Subject: overheating 4000q
>
>
> I have a puzzling problem with my '85 4000s quattro overheating.  It has
> 156k miles on it.
>
> Again, it only overheats when driving for 15 mins or more, at greater
> than 70mph, when outside temps are 90+.  It does this whether or not the
> A/C is on.
>
> It runs cool as a cucumber when the A/C is on high and I'm stuck in
> traffic, driving in the city, or crusing at only 60mph, even when
> outside temps are 100+ degrees.
>
> I have replaced the water pump, thermostat, coolant expansion tank, all
> coolant hoses, the radiator, radiator fan, water temp sender, and
> flushed the coolant more than a few times.  I'm running a 50/50 mix of
> distilled water and G12, and there are no leaks in the system.  In
> addition, I had the coolant system pressure tested at the local VW/audi
> independant shop, and had them ensure there were no air bubbles stuck in
> the system.
>
> What other components could I possible check???
>
> The engine starts and runs marvelously, revs cleanly and smoothly all
> the way to redline.  it is meticulously maintained, and I've taken
> several recent ~500 mile drives without any problems whatsoever (with
> the exception of the aforementioned overheating under certain conditions
> situation).
>
> Ideas?
>
> Thanks.
>
>
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