Oxygen Sensors

If the oxygen sensors for the 1991 Chevy 4.3 is running rich when it is warmed up it is best to have the sensors replaced. Once the sensors are replaced this should resolve the issue.

All Oxygen Sensors are located in the exhaust eitherbefore or after the catalytic converter. Your O2 sensor may not be defective as a vacuum leak can cause the code.

start at the exhaust manifold and follow the pipe or if it has dual exhaust follow both, you will see it.

no Sorry to have to correct you but yes it does. When you turn on the heater in a car two extra loads are added to the engine. First the heater fan is turned on, This adds an extra load to the alternator, which in turn puts more drag on the engine, using more fuel.

Is the extra amount of fuel used large enough to be detectable? yes, but only after you have run the heat for a long time. The second additional load, is not universal. On some cars there is an electric heating element which is turned on when the heat is turned up to high. When this element is being run, it put a pretty big load on the alternator so when it is running there is definitely a drop in MPG for the car.

it would be easiest to get a O2 sensor socket to remove it, they are located on the exhaust pipe itself, not far at all past the engine, i cant tell you how many you need but if you look and count them that would tell you that (if you cant get a O2 socket you could get it with a wrench, or sometimes a regular deep socket)

There are typically two oxygen sensors, but as many as four on a standard vehicle.

Depending on model as some have one sensor, some have two and some have four of them, I would look just before and just after the catalytic converter. The sensor reads oxygen content and reports back to the Powertrain control module (computer) the one before and the one after have a different reading as the converter changes the content. The PCM evaluates and change the fuel air mixture to correct

Bank 1 is the side of the engine that includes cylinder number 1, bank 2 would be the other side. Sensor one is before the catalytic converter, sensor 2 would be after.

The upstream O2 sensor is mounted in the ehxaust manifold The downstream O2 sensor is mounted in the exhaust pipe after the catalytic converter

bank 1 means the side of the engine where cylinder 1 is, which should be the front, by the radiator. sensor 2 is the second one you come to if you follow the exhaust manifold from the engine to the back of the car. it will be after the catalytic convertor. it looks like a spark plug, with a small wire coming out and is plugged into the wiring harness. it will be threaded into the exhaust pipe.

O2 sensors are located in the manifolds & front pipes

Leak not found and repaired.

Yes. An oxygen sensor is susceptible to contamination by buildup of oil and grime associated with the operation of the engine and it's exhaust fumes and chemicals. As long as no damage has been done to the sensor itself. When you have other mechanical problems such as bad spark plugs or dirty fuel and clogged fuel filters or even a dirty air filter your car will not run well and will cause an overabundance of waste in the exhaust that will quickly clog the oxygen sensors. Some people say if you try to clean the sensors you will damage it. So what? If you are trying to clean it, it is because it already does not work properly. Right? So use a little common sense and go for it. The best way is to use specific aerosols from your auto parts store developed for the sole purpose of cleaning sensors such as the vehicles Mass Air Flow Sensor. And sensors should be cleaned often if you want them to last. Just do not try to clean an oxygen sensor unless you get a bad code on it, and are sure it is malfunctioning. So take care of your vehicle. Spray clean your throttle body where the throttle position sensor is located. Spray clean your (MAF) mass airflow sensor which is located on the air filter housing or tube. Clean out your EGR valves because they clog up with engine gunk. Replace your fuel filters and air filters. Do all this at least once a year. These will help keep your vehicle running in top condition which will keep your oxygen sensors from getting fouled up for a longer period of time. And if no physical damage occurs to any of these sensors they will last a very long time which means you keep more money in your pocket.

The 2002 Chevy Cavalier 02 sensor can be found attached to the air cleaner housing. The O2 sensor will be on the back side of the air cleaner housing.

Every new car, and most cars produced after 1980, have an oxygen sensor. The sensor is part of the emissions control system and feeds data to the engine management computer. The goal of the sensor is to help the engine run as efficiently as possible and also to produce as few emissions as possible. A gasoline engine burns gasoline in the presence of oxygen. It turns out that there is a particular ratio of air and gasoline that is "perfect," and that ratio is 14.7:1 (different fuels have different perfect ratios -- the ratio depends on the amount of hydrogen and carbon found in a given amount of fuel). If there is less air than this perfect ratio, then there will be fuel left over after combustion. This is called a rich mixture. Rich mixtures are bad because the unburned fuel creates pollution. If there is more air than this perfect ratio, then there is excess oxygen. This is called a lean mixture. A lean mixture tends to produce more nitrogen-oxide pollutants, and, in some cases, it can cause poor performance and even engine damage. The oxygen sensor is positioned in the exhaust pipe and can detect rich and lean mixtures. The mechanism in most sensors involves a chemical reaction that generates a voltage. The engine's computer looks at the voltage to determine if the mixture is rich or lean, and adjusts the amount of fuel entering the engine accordingly. The reason why the engine needs the oxygen sensor is because the amount of oxygen that the engine can pull in depends on all sorts of things, such as the altitude, the temperature of the air, the temperature of the engine, the barometric pressure, the load on the engine, etc. When the oxygen sensor fails, the computer can no longer sense the air/fuel ratio, so it ends up guessing. Your car performs poorly and uses more fuel than it needs to.

Your O2 sensor tells your computer how the engine is running. If your air/fuel mixture is too rich, it will try to make it leaner, or vice-versa. The computer will only adjust it so much before it stops and turns on the check engine light. You can ignore it for a while, but eventually you will damage your catalytic converter and your engine. In a nutshell ... NO

one at the front of the cat and one after the cat

All O2 sensors are threaded into the exhaust system at various points. Upstream O2 sensors are located before the catalytic converter(s) and downstream O2 sensors are located after the catalytic converter(s).

in the exhuast system one before the cat and one after the cat

its screwed into the exhaust manifold,loosen the end of that connectionand unscrew it from the exhaust manifoldand screw the new one in and connect the wire to the other end.

theres TWO sensors the one I changed was the UPDRAUGHT O2 sensor located at the top of the catalytic-converter, first obtain a replacement O2 sensor ask for the ORIGINAL type to save the idiotically expensive later model pin size connector/converter...ok so remove the air-filter front , two clips at top then take out the filter element, feel UNDER the remaining metal bracket holding the air-filter body for TWO 13 millimeter bolts carefully remove these and the box is loose...then look over the back of the engine to see the updraught O2 sensor, disconnect the cable you have to lift a plastic "retaining tab" to get the plug off...then clip off the wires to the OLD duff sensor, using a small hammer (yes!) tap the top of the OLD sensor and it will break off..discard the debris, then you are ABLE to get a Snap-On 23 millimeter end to remove the Old O2 sensor, Screw in the New O2 Sensor try NOT to touch the actual sensor head /bulb, screw in by hand FIRST, then tighten gently like a spark-plug, reconnect the plug, which will ONLY go ONE way , be sure the wires are secured to the press fit holder to avoid wires burning on the HOT!! muffler pipes. THEN look in the MAIN fuse box behind the battery, open lid see a >YELLOW (30 Ampere) fuse pull it out, WAIT for 30 seconds, this will clear the fault from the ECM /computer, replace, re-assemble the air filter assembly...start the engine it may run odd for a while till the ECM sets itself up again ...after a few miles ..done!

If you are trying to replace a faulty speedometer, there should be a couple of clips on the back of the instrument cluster. All you need to do is push the lever and pull the connector out. It is illegal to disconnect the speedometer in the United States for any reason other than to repair or replace it.

It depends on the engine/manufacturer. For example, Chev 350: #1 is left bank front, #2 is right bank front. Answer The above is true, but in addition there is a visual way to tell as well. If you look at the engine block you should be able to see one of the cylinder heads, or the forward part of the casting in the block is ahead of the other side (this is because if you look at the internal components of the engine you will see 2 connecting rods will be on a single journal of the crankshaft of any V configured motor one piston is slightly ahead of the other, modern maching and casting of engine blocks will have a slight setback on one side; I am not sure but this may not be the case on very old engine blocks due to far less sophisticated casting and machining prior to the end of WWII ?) In every case that I have seen the forward most cylinder is the #1 cylinder. Additionaly Chevy does number there cylinders alternating like described above, Ford will number 1-4 on one bank 5-8 on the other in either case the forward most cylinder is the 1# cylinder.

when you put in a new chip, your engine will be more efficient but will put out more heat due to stronger combustion. so it is smart to make sure you help the engine cool when you add horsepower

An oxygen sensor is an electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed. The sensing element is usually made with a zirconium ceramic bulb coated on both sides with a thin layer of platinum and comes in both heated and unheated forms. The most common application is to measure the performance of internal combustion engines in automobiles and other vehicles. Divers also use a similar device to measure the partial pressure of oxygen in their breathing gas. Scientists use oxygen sensors to measure respiration or production of oxygen and use a different approach. Oxygen sensors are used in oxygen analyzers which find a lot of use in medical applications such as anesthesia monitors, respirators and oxygen concentrators. There are many different ways of measuring oxygen. These include using technologies such as zirconia, electrochemical (also known as Galvanic), infrared, ultrasonic and very recently laser. Each method has its own advantages and disadvantages.

An oxygen sensor is a device that measures the oxygen in a car's exhaust.

The computer uses this to adjust the amount and timing of fuel injected.