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Engine light on, code P0304

Tiny
BASSCHELSEA061
  • MEMBER
  • 2009 GMC SIERRA
  • 5.3L
  • V8
  • AUTOMATIC
  • 160,000 MILES
Engine light came on, sometimes it just blinks and sometimes it will just stay lit. Gave trouble code P0304 misfiring, and service stabilitrek and traction control light on.
Sunday, December 31st, 2017 AT 9:07 AM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

The 304 is a misfire code for cylinder number four. In most cases, it is a spark plug or coil. How long has it been since you had a tune up?

Roy
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Sunday, December 31st, 2017 AT 9:54 AM
Tiny
BASSCHELSEA061
  • MEMBER
  • 2 POSTS
Not sure, but I did a compression check and I only have 35 psi on that cylinder and 120 on the other ones.
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Sunday, December 31st, 2017 AT 12:34 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, good find. You have an issue in that cylinder. It is either burned valve or damaged piston. It will require removing the head for inspection.

Roy
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Sunday, December 31st, 2017 AT 12:40 PM

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