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Cavalier Starting in the 1980s. the Cavalier made a name for itself by offering an affordable 2 and 4 door compact.
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Rich mixture

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Old May 6th, 2022, 2:33 AM
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Default Rich mixture
Hi All.
1996 2.2 automatic Cavalier coupe. Gas smell in exhaust, black plugs, terrible gas milage. What are the most common causes for rich mixture? What should I look for?
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Old May 7th, 2022, 6:37 PM
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Injector stiuck open. Pull the plugs. The plug with the stuck injector will be a mess, the other three will look nornmal
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Old May 7th, 2022, 6:40 PM
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If an injector has been dumping fuel into a cylinder a lot of that gas will get past the rings and into the oil, diluting it. Pull the dipstick, if it smells of gas, change the oil.
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Old May 7th, 2022, 6:42 PM
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Other possibility: temp sensor telling the Engine control module that the engine is cold, resulting in rich fueling.
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Old May 9th, 2022, 8:42 PM
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Plugged up catalytic converter?
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