Subject: [s-cars] great mileage

[Vincent Frégeac]

There is two common culprit for bad mileage: T-stat and O2 sensor.

For the T-Stat, check if the temp gauge is stable around 90C whatever
the speed you're driving. If not, follow the instructions on
http://www.12v.org/maint/cc.html, go to channel 51 and check if the
engine temperature stays between 87C and 92C whatever the traffic.
Sometimes, the gauge is not stable but the engine temperature is. If the
HVAC gives low temperature when cruising on highway, change the T-Stat.

For the Ox Sensor, remove the black plastic cover behind the engine on
the firewall (two quater-turn vises). Locate the only round plug with
one wire, O2 sensor signal (all the other plugs are rectangular and
multi-wires). Pull the rubber boot and check the voltage with the engine
running. At idle, you should get a variable voltage somewhere between 0
and 1V. If not, change the O2 sensor. Locate also the rectangular plug
with two white wires coming from the O2 sensor (heating resitance for
the O2 sensor). This second plug is close to the round one. Unplug and
check the resistance on the sensor side with the engine not running. I
don't remember exactly the resistance you should get but if it's 0 or
above 1Kohms, change the O2 sensor.

HTH.




Vincent Frégeac
Research & Development
Consoltex Inc.

-----Message d'origine-----
De : s-car-list-admin at audifans.com
[mailto:s-car-list-admin at audifans.com] De la part de John Mertz
Envoyé : 20 février, 2003 10:39
À : 'Mike Platt'; outex at charter.net
Cc : Scar
Objet : RE: Subject: [s-cars] great mileage


I must have something a bit off on the car.  I'll do some checking.  How
do I check the O2 sensor and whatever else I should be looking at?  Thx.
John


 -----Original Message-----
From: 	Mike Platt [mailto:mplatt911 at yahoo.com]
Sent:	Thursday, February 20, 2003 9:28 AM
To:	outex at charter.net
Cc:	Scar
Subject:	Re: Subject:	[s-cars] great mileage

Hey Hey, on my last trip to/from Wilmington, NC... I
live in Massachusetts. Do this trip twice yearly BTW.
I averaged 25mpg in the summer, with summer tires and
no roof rack. My car is chipped also. I was pleasantly surprised. Now
the bad news. Winter time:With my skinny snow tires, gigantic fiberglass
ski box (coffin) on the roof, and cold weather. I usually get 20mpg
highway(over 65mph) and 18mpg city Summer time: With 3 place bike rack,
1 tandem and 3 kids bikes, and wider summer tires I get the same as
wintertime. Moral to story. Drive your car with nothing on the roof,
warm weather, stock size tires, and your mpg should be mid 20's on the
highway.

My $.02

Mike P.
95.5 S6 avant, 114k (with many high mile road trips)
75 911 Carrera Targa (25mpg sometimes, 7 mpg on track)
74 914 2.0 (who cares, odometer busted)

This is a multi-part message in MIME format.
--
[ Picked text/plain from multipart/alternative ]
Over the past 36 hours I had to drive to Wilmington,
NC and back on
business.  The drive down was just that:  mostly
downhill the whole way
so I
didn't calculate mileage.  The return trip (mostly
uphill) yielded
28.39
MPG!  Is that what normally happens when you put the
cruise on 74 mph
and
leave it?!?  I'm used to 20 mpg or less because of my
heavy foot/city
driving combo.  Other than that, an uneventful
trip--just wanted to
share.

Chad Hall
'95 S6
--


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