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Answered 2011-09-13 10:26:59

I had the same problem with my 92. Both the mechanic I took it to and the muffler said it needs a new catalitic converter. It is not getting warm enough in the idle mode and that is why is failing.

You should also take the car to a qualified emmissions specialist and have him pull trouble codes. There may be other reasons for your problem.

AnswerYour engine needs to be up to operating temperature. My 99 Metro had the same problem and was due to stuck open thermostat. If your water temperature gage does not read in the middle and stays near or at the bottom, then your thermostat is stuck open and you need to replace it. The needle should almost always be at the middle of the water gage and you should pass emissions.
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