Mechanics

BACKFIRING ON ACCELERATION

Nissan Sentra

1988 Nissan Sentra Wagon, mileage: 175,000, engine: 1.6L E16. Last week the car, hesitated and then backfired while accelerating quickly making a left turn from a light. The car runs smooth at idle and smooth at 35 MPH or on freeway at a steady speed. At times it runs fine. Today, it ran fine for an hour then started to hesitate and backfire unless I accelerated at a painfully slow rate. I got the car home but the other drivers probably thought I was crazy as they drove around me. But, if I pushed the accellerator down too fast the engine would backfire and I wouldn't get anywhere. What do you think? Throttle position sensor, ignition module or something else? How do you test?
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Marriott
April 28, 2007.



Engine backfires: a. Excessively rich or lean mixture
b. Overheating of engine
c. Engine conditions such as excessive
carbon, hot valves
d. Ignition timing incorrect
e. Spark plugs of wrong heat range
f. Low fuel pressure
g. Dirty fuel injectors

Rasmataz
Apr 28, 2007.