12 MPG very poor mileage
I am having a very poor gas mileage. On highway it goes to over 19 MPG, and in the city it drops to 12 MPG. Air filter, tires pressure and spark plugs are ok. I need to check the fuel filter, but the reading is to low and I am wondering what else could be. O2 sensor? Catalytic Converter? I dont have any code, can they be bad if you dont get a check engine light? What else can cause so poor gas mileage?
Thanks for the responses
I would definitely change the fuel filter. And it could be those other things you listed - O2 sensors or the cat. Dragging brakes can be a possible issue, as well as a bad reading throttle position sensor (can be tested with a multimeter easily). Do you have excessive weight in your van? That could explain the difference between highway mpg being good while the city mpg is not due to acceleration. A leaking fuel injector(s) could be a problem, or bad fuel pressure regulator. It could be a lot of things, but I wouldn't think you would need to worry about damage happening. If the O2 sensors or Cat converter gets really bad, you will get a check engine light, but they could still be 'bad' without it triggering the light as well. Wheel bearings can even reduce mpg by increasing roll resistance. You can test this a bit with a coast test, put the car in neutral and if it slows down quicker than you expect then it could be sticky calipers and/or bad wheel bearings.
I'm having the same problem with my 2010 T&C Touring. 13,5 MPG!!! Did you find out what was the problem? (No visual leak, no weight..)
Some o b d codes are whats called pending codes where the sensor is not having an all the time problem so it doesn't set the service or check engine light a restricted,or plugged catylist, o2 sensor can cause these issues. Scan twice fix once,
I'm having the same gas mileage issues with my 2012 Chrysler Town&Country i just bought, only get 12.9 MPG in town. I fill up and i'm well off of the full mark with in 30 miles of leaving the gas pump, i so have a severe foul smell of rotten eggs from the rear tail pipe. leads me to think the cat. is faulty. I've got no check engine lights, no roll resistence, i'm super upset here, my 07 Dodge Grand Caravan SXT w/ the 3.8L V-6 could go an easy 80 miles plus before it even thought about leaving the full mark after filling it up.
Check the fuel pressure regulator
I'm going to take it back to the Chrysler Dealer in the spring once weather breaks here, that is if the cost of gas don't break me first. It's under warranty.
Raymond, it sounds likely it is your catalytic converter. However, never overlook the fuel system (overfueling/running rich causes sulphur smell) or the air filter, if that is clogged it can also cause low power and sulphur/egg smell.
I just replaced the MAP sensor on mine and my gas mileage jumped back up to 18 in the city. The MAP sensor is very easy to replace and only costs $24.99 at autozone.
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