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2009 Saturn Vue Engine light

Tiny
CHARLIECHEETO
  • MEMBER
  • 2009 SATURN VUE
  • 3.6L
  • V6
  • AWD
  • AUTOMATIC
  • 177,000 MILES
P0302 (cylinder 2 misfire) is the obd2 code on my saturn vue awd 3.6L v6. Engine light always on and when I idle sometimes the engine light blinks. Service Stabilitrack and service traction control lights are often on also. A month ago my mechanic changed all the plugs, a coil and mass airflow sensor. Lights still on just like before the work was done. Occasionally I will get a rich gas smell. Any thoughts? Thanks for having this great site.
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Monday, August 24th, 2015 AT 11:47 AM

7 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,872 POSTS
Was there any change when the plugs were first replaced? Are any other codes coming up when it is scanned?
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Monday, August 24th, 2015 AT 7:28 PM
Tiny
CHARLIECHEETO
  • MEMBER
  • 4 POSTS
No change at all after plugs. No other codes showing up.
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Monday, August 24th, 2015 AT 8:22 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,872 POSTS
Remove the #2 plug wire and see if there is a change. If there isn't, make sure the plug is getting spark. If it is, check for engine compression in that cylinder.
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Thursday, August 27th, 2015 AT 4:39 PM
Tiny
CHARLIECHEETO
  • MEMBER
  • 4 POSTS
I appreciate the recommendation very much. I have coils apparently and not wires. Can I swap the #2 coil to diagnose?
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Friday, August 28th, 2015 AT 3:42 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,872 POSTS
Yes, you can. If the coil is bad, your trouble code should move to the different cylinder. If there is no change and the problem remains in cyl 2, make sure the plug is getting a good spark. If it is, make sure the injector is getting a pulse. If it is, check compression.
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Friday, August 28th, 2015 AT 8:26 PM
Tiny
CHARLIECHEETO
  • MEMBER
  • 4 POSTS
Not sure exactly what checks they did but Chevrolet dealership said I have low compression on cylinder 2. 85psi and others are 150psi. They were vague on repait cost other than saying very expensive. Any thoughts for me on repait or perhaps just a few things I could do or add to prolong the vehicle life as long as possible? As always, thank you for your time!
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Monday, August 31st, 2015 AT 8:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,872 POSTS
If you have 85 psi compression in that cylinder, that is the cause of the misfire. You could have a stuck valve, burnt valve, bad rings. At this point, the engine will need taken apart to determine what the cause of the problem is.
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Monday, August 31st, 2015 AT 8:46 AM

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