91 Sunbird runs very rough when cold


Old 10-14-07, 06:50 PM
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Join Date: Oct 2007
Posts: 1
91 Sunbird runs very rough when cold

I have 1991 Sunbird, 2.0 litre engine, auto, the motor runs very rough up until it gets well within operating temp. While driving the car when it is running rough you can help it along by pumping the accelerator. Check engine code is 45 which is rich fuel. I have checked all vacuum hoses, changed oxygen sensor, new air breather, tried a couple of different fuel injector cleaner, still the same. It almost seems that it will run rough until the raidiator fan cylces once!!! I would like to sell this car but I do not want to burden anybody else with the problems.
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Old 10-14-07, 08:18 PM
Join Date: May 2006
Location: Iowa!!!!!
Posts: 3,673
Assuming all your basic tuneup items are OK ...change the water temp sensor. The one for the computer.

Hope this helps,


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