will a bad map sensor cause a car to backfire once when starting,also can smell gas after it starts
Sep 9, 2009 at 8:33 AM
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RASMATAZ
CAR REPAIR CONTRIBUTOR
75,992 POSTS
Running rich:
Probable causes include a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode.