Posts Tagged ‘MPG’
I’m having problems with my car 2002 Pontiac Grand AM GT. It was very strange idling and has lope 500 RPM makes the car sound like it was struggling to stay alive and running. My gas mileage is around 12 MPG around 50% of EPA estimated 25 mpg when it was new. Checking the code I see that O2 (air) sensor to code, so I decided to change it. It turns out there are two sensors that you can change, upstream and downstream. One usually worsen and lead to skyrocketing fuel consumption is upstream, fortunately less than 2. $ 45.00 in Autoshope.
So I buy the sensor and replace the sensor soon return, and ultimately did not succeed. With youtube guide, not a single video or adequate description. So for anyone curious here is a walkthrough.
Some items to keep in mind, an O2 sensor requires a special socket to attach / detach, if you do not have one (you may not) Autoshope will let you rent part of the deposit, this can be done easily in the parking lot so no worries. Viewed 02 sensors will be in the back of the machine, the closest to the vehicle cabin. Opening a new sensor you to get a feel for how it should look. sensors can be found just below the rear set of spark plug wires. The best way is to let go of it so you have plenty of room to work. Think about the order in which they are installed, believe me if you do not put them back in the right order you’ll know about it before you install it.
Next how to remove the sensor from the electrical connection, it is very easy, I just slid right off. You may need a screwdriver to achieve this though. Autozshope have a special tool to remove the oxygen sensor, but unless you are exremely strong you may not be able to break loose O2 sensor. They must have a breaker bar and a special socket that will allow you to use leverage to loosen the sensor. After it is removed, note the carbon that has been built on the sensor.
What happens, the sensor does not tell the onboard computer the correct oxygen levels, which then causes the computer to inject more fuel for compression. So ride your MPG, spark plug fouling, kill the engine peformance.
Steps to install a new sensor is simple. The first screw in the sensor with your fingers until fingertight. Then use a breaker bar and tighten down sensor. Connecting the sensor to an electric power connector and replace the spark plugs in the exact order that they were in the beginning.
Start your engine must see that the cars start faster, idles a lot more subtle and does not emit excessive exhaust / exhaust odor. The true test is to see what you are up to the mileage. Go to full fill your vehicle, drive around for a few days. Trust me when I say that if gas mileage is as bad as factory smoke, if you replace your O2 sensor to work, you’ll know it’s really fast. Currently I am almost to the EPA estimated MPG to Pontiac Grand 2002 to 25 MPG, my average is 22 MPG. Fully save 50% increase just by changing the parts for $ 45.