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Cavalier
Rich mixture

Cavalier Starting in the 1980s. the Cavalier made a name for itself by offering an affordable 2 and 4 door compact.
Platform: J-body

Rich mixture

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Old

May 6, 2022 | 2:33 AM

#1

OBwan

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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 7, 2022 | 6:37 PM

#2

Jiyu

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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 7, 2022 | 6:40 PM

#3

Jiyu

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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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May 7, 2022 | 6:42 PM

#4

Jiyu

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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 9, 2022 | 8:42 PM

#5

Jiyu

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Plugged up catalytic converter?

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