Question about 1987 Oldsmobile Delta 88
The oxygen sensor just reports back to the computer if the fuel mixture is too rich or too lean so the COMPUTER can control the fuel flow.
You are sending raw fel into your converter that is overhating trying to treat that much unburned fuel. Don't do this for long or you will ruin the converter.
I'm not familiar with your ignition system, but that is where the problem is. It may be the distributor cap that has a carbon track (looks like a crack) in it. Or, it could be a coil that's bad if you have a separate coil for each spark plug.
Try removing 1 plug wire at a time to see if the misfire is the same or worse. If the ame, that is the problem area. Don't do this with the engine running unles you hae special unsulated plug wire puller or you will get a good shock.
Posted on Mar 03, 2009
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