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Is this possible? I cant find a genral consensus out there.
Ive experienced this here in FL but I am thikning that the "freezing" 60F temps that we are having should not effect mileage that much. I think ive experinced a 2mpg drop on average.
I think its a bad senor but i am not getting any codes, will it always throw a code?
Also I put a bigger CAI pipe on (3.25") a few months ago but i dont think that is whats doing it.
Do you guys think its a sensor?
PS: Full tueup done 2 months ago (filter, plugs, oil, breaks etc) and driving style has not changed.
I doubt it would be cold weather. If anything it would make your engine MORE efficient and improve your fuel economy. Cold air is denser air. 9 time out of 10 it is an oxygen sensor, whether of not it throws a code.
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Originally Posted by DarkMastyr
Is it just me, or has TN just become this massive gay fest? It's like you can't avoid the hot gayness in every thread.
The colder air will effect fuel mileage. Yes, colder air is more dense and therefore you can force more of it in to the cylinders, but you will also need more fuel to compensate for the added air. That's why one of the things most modern engine computers monitor is the temperature of the incomming air. Also, warmup times, the time it takes for the engine to reach normal operating temperature, is longer. During this warmup period your car is running a richer than normal mixture, resulting in slightly increased fuel consumption. In addition, in some metropolitan climates they switch to a Winter blend of gasoline this time of year. That Winter blend usually contains more ethanol (up to 10%). Ethanol doesn't contain as much energy as pure gasoline and therefore you get slightly less fuel mileage. You might check to see if your area does switch blends this time of the year. Here in the Chicago area we must use ethaynol blends year round, due to the polution levels.
^yes, but remember, things that usually improve power improve gas milage. An exhaust and intake will add power and mileage because the efficiency of the engine improves. But the old addage is true. You can use the effeciency to improve mileage or improve performance, but you can't use it for both.
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Quote:
Originally Posted by DarkMastyr
Is it just me, or has TN just become this massive gay fest? It's like you can't avoid the hot gayness in every thread.
The colder air will effect fuel mileage. Yes, colder air is more dense and therefore you can force more of it in to the cylinders, but you will also need more fuel to compensate for the added air. That's why one of the things most modern engine computers monitor is the temperature of the incomming air. Also, warmup times, the time it takes for the engine to reach normal operating temperature, is longer. During this warmup period your car is running a richer than normal mixture, resulting in slightly increased fuel consumption. In addition, in some metropolitan climates they switch to a Winter blend of gasoline this time of year. That Winter blend usually contains more ethanol (up to 10%). Ethanol doesn't contain as much energy as pure gasoline and therefore you get slightly less fuel mileage. You might check to see if your area does switch blends this time of the year. Here in the Chicago area we must use ethaynol blends year round, due to the polution levels.
Mike
Mr Mike,
Well said...
The cool temps increase fuel usage until the engine reaches operating temp. A slightly rich engine runs more stable than a lean one, plus your shift points are delayed so the engine doesn't stumble until the magic temp is there for everything to be happy.
The shift points alone could be noticeable. My 95 1Mz jacks the idle almost 500 rpm when down in the 40's and delays OD for a good time too, not to mention later shifts on all the other gears too.
In short, it all adds up! Then if you throw in that methenal crap, yes it burns producing less CO, but it does nothing for power and most cars I have been around get worse MPG...
Just my 2 cents...
73...
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95 Cam, V6 1MZ, Auto A541E, LE >245,000 miles!
Yeah, there are several theoretical reasons engines should get better or worse fuel mileage at lower temperatures. However, my own experience says that your fuel economy will drop at lower temperatures.
That's just the way it is!
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Digger1
"If you don't understand the technology you depend upon, you will someday be a victim of that technology."
Mine drops a few mpg's in the winter, but I've always attributed it to the fact that I jsut leave my car sitting places running a lot more, and usually let it sit there and thaw out for 10minutes each morning.
Interesting. In my Toyota 2001 Camry manual, they warn against warming up the car more than 30 seconds. Which struck me as odd. Here in New York State, we're used to warming up the cars for at least a couple of minutes. IIIRC, the manual said that's not needed so much with modern cars and that anything over 30 seconds just ads wear and tear. I'll try to find the page # and post it here
Interesting. In my Toyota 2001 Camry manual, they warn against warming up the car more than 30 seconds. Which struck me as odd. Here in New York State, we're used to warming up the cars for at least a couple of minutes. IIIRC, the manual said that's not needed so much with modern cars and that anything over 30 seconds just ads wear and tear. I'll try to find the page # and post it here
I agree with your manual. Once the oil is circulating throughout the engine, it is best to drive the car conservatively until normal operating temperature is reached. This will warm up the car as quickly as possible and at the same time give you the best fuel economy possible, given the ambient air temperature on that particular day.
Mmmmmmm.....
So new O2 sensors will IMPROVE fuel economy????
My 1992 I-4 has 150K on it and the sensors have never been replaced.
Would I just waste $$$ on getting new ones?
Also where is a good place to get em?
I'm impressed your O2 sensors lasted to 150K. I'm of the impression they don't typically make it much past 100Kmiles. I too would like to know if replacing O2/Air-Fuel Ratio sensors can really improve fuel economy.
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MPG drop due to colder weather?
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