Why does my car backfire?

Question:
what causes my car to backfire

Answers:

I have a 1986 dodge aries.. my car runs like crap but on the dash bord when the power loss light

Well that depends on your definition of back fire. If it is happening out the exhaust pipe that is actually called and after fire. A back fire is when the spark has ignited the fuel and it comes out the carburetor or intake. If it's coming out of the exhaust that is a common sign of an exhaust leak. The hot unburned fuel when mixed with the cold air out side is igniting. The cold air enters in from pin holes or other cracks in the muffler or exhaust system. This causes the after fire to happen and the loud pop.

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Please Help !!?

hay it sounds as if you may have an intake leak, look over the vacuum lines, good luck:)

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Do all 17" wheels fit 205/40/17 tires?

To add to the two answers you've already got a less likely cause is the ignition timing being out. My money is on an exhaust leak at the manifold.

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S10 engine swap - 86 into a 83?

backfire is caused by an overly lean condition in one or more cylinders sending unburnt fuel into the exhaust system

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