1998 Buick Century code po304

1998 BUICK CENTURY
100,000 MILES • 6 CYL • 2WD • AUTOMATIC
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MANTUNO
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  • 1 POST
the car was running fine when it suddenly developed a a misfire vibration. took it to autozone computer scanned a code po304. already changed the plugs and wires checked the #4 coil and ignition module a autozone both were ok\, still have the misfire problem, any solutions?
Jul 26, 2008 at 12:12 PM
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JDL
  • ✓ASE Certified Mechanic
  • 16,098 POSTS
  • ASE Certified Mechanic
Did you see the spark on #4? If you have good spark, check the fuel system. How is the fuel pressure? Can you tell if the injector is pulsing? Does the vehicle act the same way, at idle and higher rpms?
Jul 27, 2008 at 3:23 PM
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