Down to about 200 miles per full tank. . .what is going on???
Thread Starter
AudiWorld Member
Joined: Oct 2006
Posts: 403
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Down to about 200 miles per full tank. . .what is going on???
When I first bought car it was around 300 miles per tank or more(in 2005), then just a few months ago, it got down to 250 or less, and now about 200.
2000 2.7T. . .timing service done, O2 sensors changed, no CEL. No engine mods.
Normal city/highway driving.
The only thing that appears abnormal is that the trip computer fuel readout is extremely (and I mean extremely) eratic. It keeps changing from 8mpg, to 35, to 12, to ---, to 45, to 75mpg, to ---, to 16mpg, to ---, to 57mpg, etc. all in a matter of two or three seconds. Continously as I drive.
It never did this before!! Of course it would change according to my driving habit, and how much effort was being put on the engine, like when coasting it would be high, when flooring it then it would be low. . .but would adjust predictably, not jump around all over the place.
What could be causing this? What is the trip computer fuel guage hooked up to, for it to get such an eratic readout?
Any help would be appreciated it, since I am getting a full tank every few days now at $60 each time!!!!
2000 2.7T. . .timing service done, O2 sensors changed, no CEL. No engine mods.
Normal city/highway driving.
The only thing that appears abnormal is that the trip computer fuel readout is extremely (and I mean extremely) eratic. It keeps changing from 8mpg, to 35, to 12, to ---, to 45, to 75mpg, to ---, to 16mpg, to ---, to 57mpg, etc. all in a matter of two or three seconds. Continously as I drive.
It never did this before!! Of course it would change according to my driving habit, and how much effort was being put on the engine, like when coasting it would be high, when flooring it then it would be low. . .but would adjust predictably, not jump around all over the place.
What could be causing this? What is the trip computer fuel guage hooked up to, for it to get such an eratic readout?
Any help would be appreciated it, since I am getting a full tank every few days now at $60 each time!!!!
AudiWorld Super User
Joined: Jun 2004
Posts: 2,954
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Questions: How many miles on the car?
Has anyone pulled codes from the ECU?
I'm assuming you've calculated actual fuel economy and not relying on the trip computer?
If O2 sensors are new, then could be a plugged cat or something going on...or, you could have a faulty fuel tank level sending unit.
I'm assuming you've calculated actual fuel economy and not relying on the trip computer?
If O2 sensors are new, then could be a plugged cat or something going on...or, you could have a faulty fuel tank level sending unit.
Thread Starter
AudiWorld Member
Joined: Oct 2006
Posts: 403
Likes: 0
about 89k miles on car. calc actual fuel economy, not trip comp.
no codes have been pulled, I will get around to having someone do that.
how can i diagnose plugged cat or faulty fuel tank sending unit?
how can i diagnose plugged cat or faulty fuel tank sending unit?
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