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Re: 2002 ford ranger 4 cyl exhaust backfires after...
Check Oxygen sensor and associated wires. if you have access to a scan tool watch the sensor signal. it should resemble a smooth wave at idle with engine warm, if its anything else you need a new sensor.
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Faulty ignition components or spark plugs may also cause backfires if the ignition timing drifts off or the plugs fire intermittently. An exhaust leak such as broken welds or other small holes can take in cool air during deceleration and cause a popping or backfiring in the exhaust system.
If your car has a mas air flow sensor (usualy located right aroung air filter or in air passage after the air filter) check and clean the sensor. This looks like a small spring on the end of 2 wires. BE CAREFUL not to damage the sensor. I have seen where the sensor gets dirty over time and this can cause a rough idle.
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