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Showing content with the highest reputation on 01/16/2020 in all areas
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The EFI computer sets the fuel mixture based on the Engine Coolant Temperature (ECT) sensor. Since your spark plug indicates a rich mixture and your engine temp reads cold, the ECT may be bad. I have seen this happen on EFI cars. I don't think the ECT is very expensive or hard to change. Might be worth a try.1 point
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