I got a tune up recently but my gas mileage still needs help. What else is there that can be done? Also my car vibrates whenever I come to a stop. Does this mean the motor mounts are worn or does it mean something else?
My Integra got a huge increase in fuel economy when I replaced the oxygen sensor. I would expect a Corolla would see similar gains if the sensor is old. And on OBD2 cars with 2 sensors, you only need to replace the front (primary) sensor as that's the one that controls the air/fuel mixture.
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Gas mileage can be affected by a LOT of maintenance items.
Vibration under braking is commonly from warped rotors, BUT it can happen from a number of worn suspension components too.
-SP
The vibration comes once the car has come to a halt. While waiting at the traffic light, for example, the car vibrates like crazy, sometimes it's not as bad, but other times its pretty annoying.
Ok, I was on partstrain.com looking at some O2 sensors and some say before catalytic converter and some say after catalytic converter. What does this mean?
Ok, I was on partstrain.com looking at some O2 sensors and some say before catalytic converter and some say after catalytic converter. What does this mean?
Depending on the year of your Corolla, you'll either have one or two sensors. From 1996 onwards OBD-II regulations were introduced for all cars sold in America, which meant they would require at least one extra oxygen sensor (although some 95s had the extra sensor too). The one that all Corollas have is screwed into the exhaust manifold, and for Corollas after 1995, the second sensor is screwed into the exhaust pipe under the car, about as far back as the passengers seat. But as Patrick mentioned previously, the oxygen sensor in the exhaust manifold is the one that reads the air/fuel mixture and is the one that can cause poor fuel mileage if it fails. So only look at replacing that one.
To diagnose if it actually is the sensor at fault then I suggest getting a diagnosis check done. If your Corolla is equipped with OBD-I then you can do this yourself by following the instructions in my post in the link I posted earlier, but if it's an OBD-II model then you'll have to go to a workshop and get them to plug their code reader into the diagnosis connector. This will save time and money on replacing parts that don't necessarily need replacing.
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Depending on the year of your Corolla, you'll either have one or two sensors. From 1996 onwards OBD-II regulations were introduced for all cars sold in America, which meant they would require at least one extra oxygen sensor (although some 95s had the extra sensor too). The one that all Corollas have is screwed into the exhaust manifold, and for Corollas after 1995, the second sensor is screwed into the exhaust pipe under the car, about as far back as the passengers seat. But as Patrick mentioned previously, the oxygen sensor in the exhaust manifold is the one that reads the air/fuel mixture and is the one that can cause poor fuel mileage if it fails. So only look at replacing that one.
To diagnose if it actually is the sensor at fault then I suggest getting a diagnosis check done. If your Corolla is equipped with OBD-I then you can do this yourself by following the instructions in my post in the link I posted earlier, but if it's an OBD-II model then you'll have to go to a workshop and get them to plug their code reader into the diagnosis connector. This will save time and money on replacing parts that don't necessarily need replacing.
I'm sorry about my noobness but does this mean the one I should buy is before catalyic converter? I have a 96 Corolla DX
I'm sorry about my noobness but does this mean the one I should buy is before catalyic converter? I have a 96 Corolla DX
I'd suggest getting a diagnosis test done first, but yep the sensor that would require replacing (if it's at fault) would be the one before the catalytic converter. It is classed as 'bank 1'.
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So gas mileage won't be affected by an old worn out sensor, only one that is giving problems?
Both. It doesn't make a difference if the sensor is completely dead or just on the brink of dying - If it is malfunctioning in any way at all then it will affect your gas mileage. As I've mentioned previously, a diagnosis check is all you need to do to diagnose the problem. Your sensor could be completely fine and you'd be wasting money by replacing it, and/or it could turn out to be something else in addition to a malfunctioning sensor. There's one sure fire way to find out, and that's by plugging in an OBD-II code reader .
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Yep. Just came from my car. Vibration has reached a point where if I see a reflection of my headlights on a car in front of me, I see my headlights shake. Man......
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