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2007 Chevy Suburban misfire P0300 cylinder 1 and 7

Tiny
GULFGAS181
  • MEMBER
  • 2007 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 93,000 MILES
I have replace plugs and wires, even coil, clean out fuel system swap around injectors, on cylinder #7 and replace coil, still misfire. Replace PCM and crank position sensor, had it flash at the dealer, still misfire check wires and ground to computer did a compression test ok, check for pulse at injectors ok? Can any one help me?
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Thursday, November 19th, 2009 AT 2:05 PM

2 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,179 POSTS
If you are getting fuel, spark, and it has compression, then the cylender should fire. The only thing I can think of is a bad crank sensor sending spark signal at the wrong time.
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Sunday, November 29th, 2009 AT 10:05 PM
Tiny
TYMO
  • MEMBER
  • 1 POST
Gulfgas181 have you resolved your misfire problem. I also have a 07 Sub. Has misfire on cylinder 5. I have replaced all the items you replaced plus the local dealer told me I needed to have the heads reworked that there was a valve problem on left side causing the misfre. After they reworked the heads and complete valve job and $1200 later I still have a misfire on 5. Repost if you have resolved your problem.
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Monday, May 9th, 2011 AT 2:25 AM

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