For the past 3 visits to the gas stations I've been getting about 18mpg outta my corolla which seems terrible. For the calculation I do the old fashion way where you reset your trip A to 0 after a full tank and drive until you needa fill up again. Takes the miles you driven then divide by the amount of gallons of fuel you put in the car and gives you your MPG.
But anyways I don't get how my gas mileage is that bad. I mean in terms of maintance I'm on top of that.
- Mobil 1 oil change and oil filter every 5k miles or less
- Toyota ATF Type T-VI every 15k miles or less
- Tires at 32psi
- New K&N air filter
- Cleaned throttle body
I barely drive the car hard keeping it under 3000rpm. I've tried fuel additives once in a while but not often. Doesn't seem to help though. I even seaformed the car too.
I'm thinking its my mass air flow sensor being bad. I change my K&N filter quiet often and the amount of oil being sucked in and covering up the sensor is probably causing all this mess.
Anyways what do you guys think?
For the past 3 visits to the gas stations I've been getting about 18mpg outta my corolla which seems terrible. For the calculation I do the old fashion way where you reset your trip A to 0 after a full tank and drive until you needa fill up again. Takes the miles you driven then divide by the amount of gallons of fuel you put in the car and gives you your MPG.
But anyways I don't get how my gas mileage is that bad. I mean in terms of maintance I'm on top of that.
- Mobil 1 oil change and oil filter every 5k miles or less
- Toyota ATF Type T-VI every 15k miles or less
- Tires at 32psi
- New K&N air filter
- Cleaned throttle body
I barely drive the car hard keeping it under 3000rpm. I've tried fuel additives once in a while but not often. Doesn't seem to help though. I even seaformed the car too.
I'm thinking its my mass air flow sensor being bad. I change my K&N filter quiet often and the amount of oil being sucked in and covering up the sensor is probably causing all this mess.
Anyways what do you guys think?
Any CELs? How many miles? Are you letting your car warm up for a while before you drive? Have a lot of short trips? K&N filters do allow oil to get on the MAF, why dont you clean the MAF and put in a WIX or Toyota air filter? After you clean the MAF and replace the filter, I would lean towards a bad O2 sensor.
Any CELs? How many miles? Are you letting your car warm up for a while before you drive? Have a lot of short trips? K&N filters do allow oil to get on the MAF, why dont you clean the MAF and put in a WIX or Toyota air filter? After you clean the MAF and replace the filter, I would lean towards a bad O2 sensor.
The car has 67k miles on it. Yes, I let the car warm up everytime before I drive off. Very light on the throttle until it reach normal operating temp. I don't often take short trips. I can't get a toyota air filter only because I have a K&N intake on the car.
I think my best bet is to replace the MAF sensor rather than clean it. I know the sensor is a bit pricey but it's what I rather do.
The car has 67k miles on it. Yes, I let the car warm up everytime before I drive off. Very light on the throttle until it reach normal operating temp. I don't often take short trips. I can't get a toyota air filter only because I have a K&N intake on the car.
I think my best bet is to replace the MAF sensor rather than clean it. I know the sensor is a bit pricey but it's what I rather do.
How long do you let it warm up? Can you take your car somewhere where they can test your MAF and O2 sensors?
How long do you let it warm up? Can you take your car somewhere where they can test your MAF and O2 sensors?
I let the car warm up more than 3 minutes on a cold start, I usually wait until I see my temp gauage goes above the cold mark. I don't know any place that would check them. I scaned the car for any codes and no codes appear.
Warming the car up for several minutes in the driveway is a real fuel killer. With modern ECU equipped cars you can start them up and drive, more than 30 seconds of idling is a waste.
Yeah, I understand that is a real fuel killer but I always let the car warm up a bit before driving off. It shows on my other car how idling will drop your gas mileage down from the trip computer. But I play it safe and always warm up the car first.
How long have you owned it? Is 18 MPG just all of a sudden? Or have you only owned the car for 3 or 4 tanks? Letting it warm up 3 minutes will really kill your mileage. It's actually better for the engine to get in and drive it. All that fuel economy loss when your car is sitting there idling...where's the fuel going? Not all of it goes out the tailpipe; a lot of it goes straight into your engine oil, diluting it and reducing its capacity to lubricate. The absolute best thing you can do for your engine is to get in and drive it. By letting it warm up that long, you are truly doing more harm than good.
How long have you owned it? Is 18 MPG just all of a sudden? Or have you only owned the car for 3 or 4 tanks? Letting it warm up 3 minutes will really kill your mileage. It's actually better for the engine to get in and drive it. All that fuel economy loss when your car is sitting there idling...where's the fuel going? Not all of it goes out the tailpipe; a lot of it goes straight into your engine oil, diluting it and reducing its capacity to lubricate. The absolute best thing you can do for your engine is to get in and drive it. By letting it warm up that long, you are truly doing more harm than good.
i've actually owned the car since new. i have taken care of it and maintained all. the 18mpg was kinda all of a sudden which is what i dont understand. the temperatures here are like in there 20s so i tend so warm the car up first thing in the morning.
the car does idle at 2000rpm on these really cold days but i dont see it really hurting the fuel economy that badly. at least not getting 18mpg.
i've actually owned the car since new. i have taken care of it and maintained all. the 18mpg was kinda all of a sudden which is what i dont understand. the temperatures here are like in there 20s so i tend so warm the car up first thing in the morning.
the car does idle at 2000rpm on these really cold days but i dont see it really hurting the fuel economy that badly. at least not getting 18mpg.
That is odd. The strongest reasoning I have against letting it warm up is actually oil life rather than fuel economy. Fuel dilution isn't good for engine oil. I hope you can fix it by cleaning the MAF sensor. I would recommend taking out the K&N and putting a Denso fiber filter back in.
Hey guys, I replaced my mass airflow sensor today and when I took a look at the old one it was completely covered up in like some black colored oil. I took a tissue and wiped it and it was like pretty damn dirty. I could've cleaned it but I rather not take the chance to damage it so I replaced it. These sensors are damn pricey, 173 dollars is how much I paid at the dealer.
Anyways, if you guys been using K&N air filter I recommend checking on the condition of your mass air flow sensor. Its easy to take off, just a small allen key.
That's a great reason NOT to use those silly oiled filters. Did you install yours new? In other words, you installed it pre-oiled, and not oiled yourself?
I have an AEM Brute Force intake on my Dakota with their Dryflow filter. That's the only aftermarket filter I'd install if I wanted an aftermaret one on the Corolla. It's completely dry -- no oil to fool with. Oil bath filtering systems are yesterday's technology. I need more than a thin film of oil between the outside world and my engine internals, please.
If you replaced your entire intake system, and have a K&N cone filter on it, there are better options for you. You can spec out the size of the AEM Dryflow filter you need, and replace the K&N. You won't have any issues again!
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