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

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