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DME and fuel efficiency

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B

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Dec 15, 2010, 9:41:55 PM12/15/10
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could low fuel economy be explained by a dying DME?

Bill Noble

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Dec 22, 2010, 1:46:40 AM12/22/10
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On 12/15/2010 6:41 PM, B wrote:
> could low fuel economy be explained by a dying DME?

no, but low fuel economy could be imaginary - I thought I was down to 9
mpg, but it was the odometer gear failing.

low fuel economy is frequently the driver. or the cat. or a dirty air
cleaner.

B

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Jan 17, 2011, 4:40:09 PM1/17/11
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yeah, its looking like the new DME isn't making a huge difference.
figured the fuel pump is controlled by it, also changed the fuel
pressure damper, so if that wasn't right...

On Dec 22 2010, 1:46 am, Bill Noble <nob...@nowhere.czm> wrote:
> On 12/15/2010 6:41 PM, B wrote:

> the cat.

really - how so?

-Bryan

Bill Noble

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Jan 22, 2011, 12:49:58 AM1/22/11
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been there, done that - at the age of your car the cat is almost for
sure bad - backpressure reduces engine economy and power, and poisoning
of the catalyst makes it not work - on the last 2 944s that failed NOx
tests, changing the cat fixed it and improved mileage, power, and
smoothness. The DME is digital, pretty much it's going to work or not -
I smoked a transistor in one once (and repaired it) but that is not a
common failure (it was a "mechanic induced" failure)

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