[s-cars] Rich - continued.

[Mark Strangways]

Lots of these sensors are NTC, this means Negative Temperature Coefficient.
So, when a sensor fails open or it's wires break, what happens. The 
resistance goes to infinity. This translates into a VERY cold reading that 
the ECU thinks the engine is at.
Hence running rich.

Mark
----- Original Message ----- 
From: "Evan Levine" <evan.levine at gmail.com>
To: "S-CAR at audifans.com" <s-car-list at audifans.com>
Sent: Wednesday, December 15, 2004 3:04 PM
Subject: [s-cars] Rich - continued.


> Ok so those who recall... a few days ago I was stating how the car has
> been running rich and no one can figure it out. Had a weird glitch
> today...
>
> I get in the car after work, start it up. Immedietly the temp warning
> light comes on... run out to the front, check the coolant, full. Get
> back in the car, light is off... drive it very carefully for a couple
> miles watching the temps... they get up to normal, and stay there.
> Couple minutes later I look at the A/F and realize it's operating
> normally, not running rich anymore. Horsed her a bit... (16 psi or
> so), pulling smooth and strong... stayed this way all the way home.
>
> What are the odds that the light coming on for no reason is a
> coincidence?? It seems to me like this may be evidence that a sensor
> somewhere is not functioning properly?
>
> If the ECU is not getting a signal from a temp sensor will it run a
> default rich program or anything along those lines?
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