IN THE LAST YEAR MY 2003 4CYL 2.2L ALERO HAS BEEN SUCKING UP THE GAS REALLY GOOD, ON AN AVERAGE I GET ABOUT 300-340 KM A TANK ( 50L ). CHANGED THE OXYGEN CENSOR, BUT THE PROBLEM STILL PERSISTS. WHAT CAN I DO?
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There are many things that could conspire to rob mileage. My first thought was possible transmission slippage. Although your city rating is horrible, the highway mileage is just a little off. 23-25 hwy is correct, 23 for lousy doped California gas, and 25 elsewhere. My guess is that you have slippage but above 45 mph, you are still getting advantage once the converter lock takes effect in overdrive. Just slippage until you reach that lock point.
Start with a full diagnostic of all stored codes in the ODB II computer, both for the engine and the transmission, then an evaluation of your transmission from a good shop.
Good luck, the Equinox is a darned good car,and worth the effort.
run the fault codes first then consider a problem heated oxygen sensor/s
consider a blocked cat converter/s
your stated average consumption is 20 mpg so you are either speeding or have a problem to start with
That car should be around the 400 miles mark per tank
The gas tank capacity is 20 US gallons, but the tank will really only hold about 19.5 gallons. As far as mileage goes that really depends on your driving habits and the load it carries, just you? more? I would think that your average miles to the gallon would be in the range of 14-16 town and highway.
Here is the EPA ratings, which never match the real world gas mileage.
change your spark plugs if they haven't been changed in awhile. check your tires for the propper psi there should be a sticker on the inside of your drivers door that will tell you recomended air pressures go by this not the recomendations on the tires. also where are you getting you gas does it contain ethanol sometimes this can burn faster.
to increase gas mileage make sure you keep on top of tire air pressure you can also have your tires filled with nitrogen instead of air also a K&N air filter does wonders and is good for lifetime worth every penny. another smart move is to use a fuel system cleaner regularly Lucas makes great products for this try local parts store.
Sounds like you've got a defective fuel level sending unit. It's in your tank, probably attached to the boost pump assembly. Normally the top of the tank can be accessed via the trunk where you should be able to remove the assembly for replacement. While you're in there, look around in the tank with a very bright flashlight for any debris or pieces from the assembly laying on the bottom.
Horrible gas mileage can be caused by very many things. Try to buy an OBDII diagnostic scanner to figure out what's malfunctioning. Sensors don't last very long, and can wreak havoc on performance and economy.
I have the same problem as talked about above. 2002 Hyundai accent gsi. HORRIBLE gas mileage. I only get about 320 km per full tank. My driving habits are good. i took it to the garage and they put it on the computer and no error codes showed up. Question: Can a MAP sensor be faulty but NOT show up on the computer diagnostic? I had my O2 sensor checked out and my exhaust, and changed the flex pipe. Car runs pretty good just horrible gas mileage and kinda crappy power. Changed fuel and air filter. Cleaned the fuel system entirely ($80 at garage not $4 bottle).
Check the following things: air filter, wheel alignment, and timing belt, all of them if not serviced on time can affect your fuel consumption. I do not think its the heat because I drive my car in Phoenix AZ with temperatures comparable to Dubai and I still get 500+ km/tank.