2003 Pontiac Aztek misfire

Tiny
S3AHAWKS
  • MEMBER
  • 2003 PONTIAC AZTEK
  • 3.4L
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 160,000 MILES
I have a misfire on the 6th cylinder. I have replaced the wire and plugs and no change. The misfire started when stopped at a light no misfire prior to that. I then replaced the plugs and wires.
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Monday, November 10th, 2014 AT 9:07 AM

9 Replies

Tiny
JDL
  • EXPERT
Are there drivability issues or just a code? Can you feel the misfire? Just about anything can cause a misfire, fuel--spark--compression.
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Monday, November 10th, 2014 AT 9:54 AM
Tiny
S3AHAWKS
  • MEMBER
Yes, I can feel the misfire.
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Monday, November 10th, 2014 AT 10:02 AM
Tiny
JDL
  • EXPERT
Did you visually check for spark at that cylinder? If you have spark everywhere, check fuel--compression.
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Monday, November 10th, 2014 AT 10:05 AM
Tiny
S3AHAWKS
  • MEMBER
It does have spark on all cylinders.
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Monday, November 10th, 2014 AT 10:09 AM
Tiny
JOHNNYT73
  • EXPERT
Sounds as if you may want to replace the coil pack. Try this, remove the two wires that go the coil pack for cylinder #6 (I think its coil pack 3 and 6). Remove them both and start the car. If you are getting a good strong spark then the two towers should arc to each other. If they do not, then I suspect a weak/bad coil.
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Monday, November 10th, 2014 AT 1:39 PM
Tiny
JDL
  • EXPERT
Hope you got it going your way?
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Thursday, June 25th, 2015 AT 8:13 AM
Tiny
S3AHAWKS
  • MEMBER
No I have replaced the coil pack and no change.
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Thursday, June 25th, 2015 AT 8:18 AM
Tiny
JDL
  • EXPERT
If good spark at all the spark plugs then it isn't the coil pack. Try swapping the #6 fuel injector to a different cylinder, see if the problem follows the fuel injector?

You got a code p0306 correct?
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Thursday, June 25th, 2015 AT 9:09 AM
Tiny
JDL
  • EXPERT
Do an ohms test on fuel injectors, all fuel injectors should be within 3 ohms of each other. If the reading on any fuel injector is way off compared to the others, that fuel injector is suspect.

One fuel injector spec, 11--14 ohms at 50--90 degrees F.
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Thursday, June 25th, 2015 AT 9:24 AM

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