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Discussion Starter #1
2009 Saturn XR with tow pkg. 54,200 miles


Got a P0306 code (Miss on cylinder 6)
Chevy dealer says $150 coil pack on cylinder 6.
I asked him if the others were ok.
His reply was that they all had a high resistance and that changing the one may or may not affedt the resistance on the others.
Kind of sounded like others could fail at any time.
The number six is easy to get to but the rear bank are difficult, must remove a few hoses, wires and intake manifold.
I tow a travel trailer and spend a lot of time in out of the way places.
So I asked for a price to replace all six and the spark plugs while in there.
Bottom line is $1525.00

Whatever happened to the $25 coil that ran the whole engine ?
And why did they design so the intake manifold has to come off to change the coils and plugs ?
 

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Because when GM engineers design something, they design it to make that component easy to assemble. They usually didn't consider who has to work on that component when it was installed in the vehicle. Maybe the new GM is different. They also use the same engines in different vehicles which are easier to work on in most instances. One size fits all kind of thing.
Shop around to local shops for a better price, or do it yourself. I don't see where changing one will affect resistance on others. The parts go for $32-$65 on Rockauto. I haven't checked the cylinder numbers, are 2,4,6 in front? If this is the case lucky you. You can always swap two coils to see if the problem moves with the coil, or stays with the plug/injector.
 

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on the 2010- which is prob the same as the 09, there is a coil that hits parts of the intake-- and wont allow it to come off.... so removal is required.

but electbc--- I agree with what he said
 

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rbarrios said:
on the 2010- which is prob the same as the 09, there is a coil that hits parts of the intake-- and wont allow it to come off.... so removal is required.

but electbc--- I agree with what he said
Agree with what? What the dealer said about resistance being affected on one coil by changing out another coil?
 

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as in I agree with what electbc said.


I agreed with your post.... is what I meant.
 

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OK thank you for clarifying. It didn't seem logical that changing a coil would affect the other coils resistance.
 

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A lot of misfires have been surfacing on these lambda forums. On Acadia someone had a #2 misfire, changed just that plug and still it misfired. They went on to change all 6 and now it is running like a top.
 

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$60 dollars for plugs is a lot cheaper, and depending on your usage, probably necessary anyway. I'd go with the plug route first. Just my $0.02.
 

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Update. The miss returned, he is now looking into a fuel delivery problem. I believe the fuel rail has crud near the #2 injector since he is getting misfire on # 2 as well as fuel pressure fault. Pressure switch is just beyond #2 injector.
 

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Discussion Starter #10
Had all coils and plugs replaced.
1 week later, miss on cylinder 4.
One of the new coils installed had gone bad.
Dealer replaced no charge.
 
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