Question about Pontiac Grand Am

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Just bought 89 grand am. Owner said that it ran fine except for a few things. It has an hole in the muffler, It runs on three cylinders, and it's been sitting for months.He said it did stop on him, but didn't over heat.. I started the car and it ran for a few minutes and cut off. It didn't want to start so I assumed it was old gas. I changed the spark plugs and two of the coil on plugs because one had no spring in it. Also I added fuel cleaner in it. It ran good for afew days. Then it loss alot of power and wouldn't go pass 50 mile per hour. Now it wont stay on unless I keep my foot on the gas. I jumped terminals A & B like the book says and it said it's a bad oxygen sensor. Please help me with any advice you can give me.

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  • An Oxygen sensor sniff for fuel to adjust the fuel to air ratio. When they go bad the run lean all the time. So you don't get sufficient fuel. So if the code read O2 sensor then you should change one or both out. It's not to hard. Thing is there are two O2 sensors on your car. You have an Upstream and a Downstream. The Upstream is not far off the manifold and the Downstream is down the exhaust by the Catalytic Converter. It could really be either one. I put a video up on how to test an O2 sensor. If you don't have the proper gauge then you can rent one or replace one and if need be replace the other. If the vehicle has set for a while and is not performing right it might not be a bad idea to put both on. It's not to hard to change the O2 sensors. You pull the connector off it and put an O2 socket on the end and twist it out, like you would a spark plug. Then replace with a new one. I would start with the one on the exhaust not far off the manifold and then if need be move downstream. Sometimes you have to move a thing or two out of the way to get to that Upstream O2 sensor but it has to be done.

Regards, Tony

Posted on May 20, 2011


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