What would cause the car to run rich? - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com
 
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Old 05-18-2002, 09:44 PM   #1
Boots
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What would cause the car to run rich?

There was a car in the classifieds, and the price is marked down signicantly because it runs rich. The ad also mentioned that it had a new turbo/manifold. Would this be caused by a bad o2 sensor? what else could be wrong?
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Old 05-18-2002, 10:08 PM   #2
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also check temperature sensor(in thermostat housing.)

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Old 05-19-2002, 12:11 PM   #3
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A damaged O2 will surely cause a rich condition. Also a BIG aftermarket fuel pump, with no aftermarket fuel pressure regulator will cause it to run rich too.
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Old 05-19-2002, 01:11 PM   #4
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There can be a lot of things that cause a car to run rich. As mentioned a larger fuel pump will obviously make it run more rich. An intake leak will obviously cause it to run rich. O2 sensor as mentioned if fouled will cause the car to run rich. My question is what caused him to think that it is running rich? Spark plugs? Exhaust pipe caked in black as well as the back bumper? O2 voltages? Exhaust smell? Backfiring? I'm just curious.
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Old 05-19-2002, 06:41 PM   #5
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Quote:
Originally posted by 16g-95GSX
There can be a lot of things that cause a car to run rich. As mentioned a larger fuel pump will obviously make it run more rich. An intake leak will obviously cause it to run rich. O2 sensor as mentioned if fouled will cause the car to run rich. My question is what caused him to think that it is running rich? Spark plugs? Exhaust pipe caked in black as well as the back bumper? O2 voltages? Exhaust smell? Backfiring? I'm just curious.
He said black smoke and the smell of the exhaust
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Old 05-19-2002, 09:53 PM   #6
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"There can be a lot of things that cause a car to run rich. As mentioned a larger fuel pump will obviously make it run more rich. "

This shouldn't make the car run richer, as the base fuel pressure doesn't change.
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