Question about 1991 GMC Sierra

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Oxgen sensor broke out of pipe

'not the original engine, standard 4x4 w/ dual exhaust
wher are #'s i might need to find replacment parts

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The only thing you need to be concerned with is the amount of wires that go to the oxygen sensor, you state that it is not the original engine but I assume that you still are using the original loom and computer control system for your truck and if so you can reference the oxygen sensor connector.. Will have to use same oxygen sensor for original engine....Good Luck

Posted on Jan 07, 2009

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1 Answer

Where is o2 sensor


You have not identified the vehicle and the locations are vehicle specific.

There is more than one sensor.

Typically on a single exhaust engine there will be one on the exhaust pipe running off the exhaust manifold and a second sensor on the exhaust behind the catalytic converter.

On a V6 or V8 engine with dual exhausts, typically there will be 4 sensors - one on each exhaust pipe leading off each exhaust manifold and one on each exhaust pipe after each of the catalytic converters.

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Where is the oxegen sensor


O2 Sensors are in the exhaust system

In the pipe from the engine to the exhaust converter
or in the converter inlet

That is the upstream sensor, used to control the
fuel injection pulse width or fuel trim.

There are other downstream O2 sensors, called monitors,
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The ones closest to the engine get replaced at 100,000
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You need the codes & have to test to find a solution

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I'm sorry for your troubles but have they checked for a plugged exhaust pipe after the cats or a plugged fuel filter? I had car in my shop some years ago that did the same thing as yours and it turned out to be a collapsed pipe between the cat and the muffler. some G.M. cars had a double pipe system and the inside pipe would collapse and shut off the exhaust from coming out. Have they disconnected the rear pipe after the cat to see if the engine responds better and changed the fuel filter? If it's fuel injected, did they check the preasure regulator by disconnecting the vacuum hose to it to see if it made the preasure go up? The fuel pump in the tank may not be giving the engine enough fuel preasure any more. Put your hand at the exhaust pipe while its running and see if it feels like its coming out o.k. The sock filter at the tank pick-up may be clogged also. These are things I would have checked before doing all of those expensive repairs that were done when most times it is'nt going to fix it. After almost 20 years, some of the original, never - removed pieces are going to go bad. Like the tank filter and exhaust pipes.
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Craig

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Stop by your local auto parts store and ask how many oxygen sensors the Honda Civic has installed. They are usually installed on the exhaust pipe before the catalytic convertor, and screw off with an open-end wrench. The heat causes the sensor to be a bit difficult to remove, and you will need to put some anti-seize compound on the threads of the new sensors. Most cars have 2 or 3 oxygen sensors.

Your local AutoZone can also put the diagnostic computer on you car which should indicate whether its actually a bad oxygen sensor, or they will read the error codes to tell you what the problem really is. Best of all, it's FREE.

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