[s-cars] Cold weather and lousy fuel mileage

[Mark Strangways]

Your coolant should be 95 to 100 C ....
Change your stat, you should be ok then.
BTDT..

Mark
----- Original Message ----- 
From: "Stott Hare" <stott at gwi.net>
To: <s-car-list at audifans.com>
Sent: Friday, March 09, 2007 1:12 PM
Subject: [s-cars] Cold weather and lousy fuel mileage


> Weather here in the Northeast has had the temps hovering around 0*F, and 
> my
> fuel mileage has gone straight to the toilet.
>
> Nice weather (40*F>) and 95% highway I can pull 21mpg and around 400 per
> tank.  Cold weather and 85% highway and I watch my mileage plummet to 
> 16mpg
> and maybe 250-300 miles a tank.  Watching the TDS1 when the outside air 
> temp
> is an indicated 0 - 15*F  shows an intake air temp ~20-25* warmer.
>
> Patient is a 95 S6A with 252k on the clock.  Still stock.  Receives 
> routine
> maintenance.  She plugs, oxy sensor and fuel filter were done around 204k 
> so
> they could be considered due, but I would expect that to cause decreases
> across the board, not temp specific.  Coolant temp is rock solid at the
> first fat bar (~10 o'clock).  Multi-function temp sender was done at 204k.
> The HVAC temp sensor in the coolant line between block and heater core
> replaced about 230k.  No CEL or codes.
>
> My prior experience with the CIS cars didn't yield such temp sensitive
> performance, if you had the car tuned right and all sensors working.  Is
> this something particular to the Motronic / hot-wire MAF systems?  Is the
> incoming air so cold that the hot wire isn't?  I don't have my mixture 
> gauge
> in at the moment, but I suppose I will hook it up this weekend and watch
> mixture over the next week.  When I had it hooked up in normal temps
> previously (within 5k), mixture behaved as expected at idle and cruise, on
> throttle and off.
>
> This just the way things are? or is this an indication of a (temp) sender 
> or
> something that is begging for replacement.
>
> Thanks!
> -Stott
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