2002 Nissan Almera misfire diagnosis

2002 NISSAN ALMERA
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GILLIAN ASPINALL
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Engine Mechanical problem
2002 Nissan Almera Two Wheel Drive Manual 45661 miles

A malfunction light stays on. Garage diagnosis engin misfire, but they do not know why and say they have to drive the car to see when it happens. I said the car shudders slightly before the malfunction light came on
Aug 16, 2010 at 6:46 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Engine running rough or misfiring can be cause by the following:

Defective spark plug.
Inadequate spark/coil,defective spark plug wire.
Lack of compression
False air leakage.
Faulty fuel injectors.
Insufficient fuel pressure.
Contaminated fuel.
EGR valve that is leaking.
Oxygen sensors.
Throttle Position sensor
Idle air control valve
Aug 16, 2010 at 6:54 PM
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