[s-cars] RE:Was - Original Chips - Now - MPG

[Ned Ritchie]

Oxygen Sensors 101

"What Happens to Fuel With an Engine Miss?"

A little engine MISS will drive the oxygen content of the exhaust upward.

This is correctly detected by the O2 sensor, but an inappropriate conclusion
of a TOO LEAN condition is reached.  The Computer lengthens the duration of
the pulse of ALL the injectors to correct the SUPPOSED LEAN condition
causing a RICH STUMBLE which may make another cylinder MISS with it's oxygen
not burned going out the exhaust.  WHOA!  More oxygen!  The situation just
gets worse.  More fuel is added.  VERY POOR MILEAGE!!!  

Now throw in a defective temp sensor, thermostat, or a sluggish O2 sensor. .
.

Ned Ritchie
www.IntendedAcceleration.com


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Bill Clancy
Sent: Wednesday, April 06, 2005 10:00 AM
To: Abhijit Kondajji; s-car-list at audifans.com
Subject: Re: [s-cars] Re: Was - Original Chips, Now - MPG

Hmmm
I have known for a while that my thermostat is not working correctly.   But
since I rarely need the heater I forget about it.    That must be part of my
problem.

thanks for the reminder.
-Bill


----- Original Message -----
From: "Abhijit Kondajji" <abhijitkondajji at gmail.com>
To: <s-car-list at audifans.com>
Sent: Wednesday, April 06, 2005 7:44 AM
Subject: [s-cars] Re: Was - Original Chips, Now - MPG


I get about 24 MPG on the highway with intermixed 75 MPH/90 MPH
driving. In the city, my daily work commute is 5 miles one way, in
heavy stop and go traffic and I still get about 20 MPG. The car is on
Mihnea Crack II chipset and is otherwise up to date on maintenance.

When I had a stuck open thermostat, the most I got was 13 MPG and a
severe cold/sniffle from living in an Igloo (maybe it just resembled
one inside).

Adding my 2 Rupees, which is $0.00002......

Regards,
Abhijit


Date: Tue, 5 Apr 2005 21:58:19 -0400
From: "Tom Mullane" <tmullane at snet.net>
Subject: Re: RE: [s-cars] RE: Original Chips
To: <s-car-list at audifans.com>
Message-ID: <200504060159.j361xYYj028343 at ylpvm53.prodigy.net>
Content-Type: text/plain;       charset="us-ascii"

Since this fuel thread is turning into a survey, I may as well weigh in.

My car gets somewhere around 10 mpg.

Due to this crazy FMIC project and the winter weather, the S lives in the
garage most of the time.  When it does come out, it is usually only for a
few hours of driving that would make Paul K look like my grandfather.  It
also gets plenty of idling time.  Current status is immobile, but I have
hopes.

I follow the same course with the Miata, but I can't seem to get less than
20 mpg out of that.  Maybe a chip....?

Tom