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Had the same problem on my 89, the fan doesn't come on until around 230, no big deal there, but if the blend door actuator is not working that is a big pain.

ok thank you:)

Thank you for your help. one more question, there are two sensors, one upstream, one downstream by the cat. Do you need both?

Hello my question is for my 89 vette. We are building a stroker moter for it and want to put headers, with no cat converters. The question is how to get rid of 02 sensors, or do you just tap them into new exhaust? ;help