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I believe you are seeing your Oxygen or 'O2' sensor. It measures the ratio of oxygen in the exhaust and sends the info to your car's computer while you are driving. If the O2 sensor is bad your car can run poorly. It is one of the more important sensors on you car.

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โˆ™ 2006-03-13 02:08:32
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Q: You have a 91 Chevy lumina as it has on the manifold something that look like a spark plug but it is not as what is this and what does it do when the car is running or driving it?
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Ive replaced the thermostat water pump and flushed the radiator on my 96 Chevy lumina and now it jumps from 125 to 260 while im driving It also overheats while im driving.?

You may have the problem of your intake manifold gaskets. They are a problems on the lumina. I had to have mine replaced due to the same thing. Also check if your coolant is mixing with your oil if it is. Than it is definitally your intake manifold gasket.

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Most oxygen sensors are either on the exaust headpipe just after the manifold or on the manifold. I don't know where it is exactly on the Lumina but that is where you should start looking.

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Where is the starter on the Chevrolet lumina ltz?

Under the front bank exhaust manifold.

How do you change the thermostat on a 2000 Chevy Lumina?

do i need to change the manifold when replacing thermostat

What causes a surge in a 1993 Chevy lumina 3.1 sedan?

Try cleaning the intake manifold.

What is the torque specification for the lower intake manifold on a 97 3.1L lumina?

10 ft lbs

Where is the oxygen sensor for a 95' Chevy Lumina?

The sensor is located in the rear exhaust manifold.

Were is oxygen sensor on a 93 Chevy Lumina?

Back side of the engine....mounted in the exhaust manifold.

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its under the air filter box and below the exhoust manifold

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screwed into the exhaust pipe, under the vehicle, close to the exhaust manifold

Where is the egr valve on a 2000 Chevy Lumina?

The EGR valve on a 2000 Chevrolet Lumina is located inside the intake manifold. A replacement valve can be purchased at any auto parts store.

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It is installed on the top of the back side exhaust manifold.

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that's what it is, i have a lumina, had same problem, replaced the intake manifold. run like a top since

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A 1997 Chevy Lumina will hold roughly 18 gallons of gas. The 1997 Chevy Lumina averages about 18 MPG for city driving and 26 MPG on the highway.

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upper or lower? if it's lower you can bet on paying upwards of 400$

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Where is the O2 sensor in a 1990 Chevy Lumina Euro 3.1?

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I was driving down the road and my car lights went dim and my 1992 lumina started to lose power.

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The oxygen sensor is usually mounted in the exhaust manifold pretty close to where the exhaust pipe bolts on.

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The daytime running light module on the 1992 Lumina Euro is located in the fuse panel below the steering column. On certain models, this module is found behind the glove compartment.?æ