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1998 Buick Century code PO304

Tiny
MANTUNO
  • MEMBER
  • 1998 BUICK CENTURY
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
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?
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Saturday, July 26th, 2008 AT 12:12 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
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?
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Sunday, July 27th, 2008 AT 3:23 PM

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