[s-cars] I want my MPG

Wed Jun 11 17:47:09 PDT 2008

If we could find out what the computer wants to see (resistance) at 95 C 
then you could substitute a resistor and test the results.
Maybe the cold start valve is sticking, but I would have to imagine that 
would screw the idle.

Mark
----- Original Message ----- 
From: "Theodore Chen" <tedebearp at yahoo.com>
To: "s-car-list" <s-car-list at audifans.com>
Sent: Wednesday, June 11, 2008 8:13 PM
Subject: Re: [s-cars] I want my MPG

> i'm reviving this topic because my car isn't passing smog.  a little too 
> much HC at 2500 rpm, but passes otherwise.  low O2 in the exhaust, 
> indicating that the cats are probably doing their job (and the cats have 
> just been replaced).  without getting into all the hairy details yet 
> (since i don't know exactly what the shop has done so far)... it occurred 
> to me that a faulty engine temp sensor might cause the computer to think 
> the engine was still cold, and keep the mixture too rich.
>
> how do i test this?  the temp gauge in the instrument cluster shows normal 
> operating temperature.  i've also used an IR pyrometer to check the 
> temperature of the radiator, and it's about 195 degrees (so i'm ruling out 
> a bad thermostat).
>
> from the email below, it sounds like the climate control uses a different 
> sensor from the one used by the ECU.
>
> -teddy
>
> ----- Original Message ----
> From: Stott Hare <stott at gwi.net>
> To: Floyd Noel <floyd.noel at gmail.com>; Tom Green <trgreen at comcast.net>
> Cc: s-car-list <s-car-list at audifans.com>
> Sent: Friday, December 28, 2007 8:12:16 AM
> Subject: Re: [s-cars] I want my MPG
>
> Couple things to keep in mind...  if the MIL lamp doesn't prove out at 
> start
> up, Floyd's car may have a burnt out bulb, or be one of those car where 
> the
> bulb is missing altogether.
>
> Regarding temp senders, I believe the sender in the heater core T fitting 
> is
> to tell the Climate Control what the coolant temp is, and it is the 
> reading
> that can be viewed by the CC head diagnostics.
>
> However, the temp sensor that the ECU uses for determining fuel mixture is
> the white sensor screwed into the rear of the head or block (I forget 
> which
> exactly).  Then there is the multifunction temp sender in the water 
> manifold
> which drives the temp gauge in the instrument cluster.
>
> HTH,
> Stott Hare
> 95 S6A
>
> -----Original Message-----
> From: s-car-list-bounces at audifans.com
> [mailto:s-car-list-bounces at audifans.com] On Behalf Of Floyd Noel
> Sent: Thursday, December 27, 2007 12:41 PM
> To: Tom Green
> Cc: s-car-list
> Subject: Re: [s-cars] I want my MPG
>
> The computer hasn't said anything strange, no lights are on. I still
> need to get a VAG-COM to check for codes. The smoke is gray.
>
> R/S
> Floyd Noel
> Sgt/USMC
>
> On Dec 27, 2007, at 9:17, Tom Green <trgreen at comcast.net> wrote:
>
>> Mail call, Floyd.  Now, listen up!  Like when the Gunny holds mail
>> call on TV.  :-)
>>
>> Have you been getting a MIL (check engine light) ?  It does come on
>> when you
>> turn on the key and then go out when you start, doesn't it?  Have
>> you blinked out
>> any trouble codes or checked them with a VAG-COM ?  A bad O2 sensor
>> will give
>> codes.  Almost everything else that affects mileage will drop
>> codes.  After you read
>> them, tell us what they are.   What color is the tailpipe smoke?
>>
>> Use that procedure to read the data on the climate control head,
>> especially the
>> engine coolant temperature to compare with the instrument panel
>> gage.  If you
>> mess with the hoses and fittings on the back of the engine and the T
>> fitting that
>> holds the temp sensor, be gentle as these plastic fittings get very
>> brittle with age.
>>
>> Tom
>>
>> -----Original Message-----
>>> Date: Wed, 26 Dec 2007 20:39:31 -0800
>>> From: Floyd Noel <floyd.noel at gmail.com>
>>> Subject: [s-cars] I want my MPG
>>> To: s-car-list <s-car-list at audifans.com>
>>> Message-ID: <E09434D2-6047-4F68-BD0B-D23930DCAE0D at gmail.com>
>>> Content-Type: text/plain;    charset=US-ASCII;    format=flowed;
>>> delsp=yes
>>>
>>> Listers,
>>> My s-car has been getting horrible mileage lately (around 11.5) and I
>>> have been trying to diagnose the problem. Power seems like it has
>>> gone
>>> down as well, but my butt dyno isn't the most accurate, and it still
>>> has way more than my work Malibu. It also seems like to me that there
>>> is more smoke coming from the tailpipe than I would prefer on cold
>>> mornings, but in the daytime it is not really a problem. I just
>>> replaced the spark plugs recently, not much difference.   From the
>>> research I've done, it seems like it might be the oxygen sensor, and
>>> I'm not sure when the last time it was changed, so I figured it
>>> wouldn't hurt to change it. Are there any other things I should
>>> consider or steps I should take? I bought fuel injector cleaner as
>>> well but haven't used it yet.
>>> TIA
>>>
>>> R/S
>>> Floyd Noel
>>> Sgt/USMC
>>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
>
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
>
> _______________________________________________
> S-CAR-List mailing list
> S-CAR-List at audifans.com
> http://www.audifans.com/mailman/listinfo/s-car-list
> 