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Discussion Starter #1
Hello all,
My 06 aero with 145,000 miles was running perfect until tonight when I get a CEL code P0303. Car missing etc. I am second owner and bought with 113,000. I have never changed coils or plugs while I’ve owned and don’t know if ever done by previous owner.
Would like the correct stock plugs to replace and coils? Want to make sure I get the correct parts. Rock auto has the Bosch, are those ok?
Engine is stock

thanks
 

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NGK PLFR6C-10G plugs
 

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I would only do .032-.035. A gap of .044 is too big for boosted motors IMO and is one of the main reasons 2.8s go through coils. GM later updated the HFV6 motor to work off .035 in the ATS-V and that made significantly more power than the 2.8 with no misfire or coil issues.
 

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I would only do .032-.035. A gap of .044 is too big for boosted motors IMO and is one of the main reasons 2.8s go through coils. GM later updated the HFV6 motor to work off .035 in the ATS-V and that made significantly more power than the 2.8 with no misfire or coil issues.
That is good info right there. I’ll regap once I get tuned. As of now I only drive the car a few hundred miles a month and am not pushing it hard.
 

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Discussion Starter #7
Thanks for the reply’s. I’ve read .80-.90mm or .031-.035” is good. So you have answered my my question.
 

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If you get tuned, you really need to tighten the gap! Upping the cylinder pressure makes the chance of a misfire even worse. I ran 0.80mm (.0315”) on my tuned ‘11 9-5 Aero with the 2.8. Worked out great. I’m also a fan of the Denso Iridium IKH22, which is about one heat range colder than stock (great for tuned cars) and incidentally comes tapped at 0.80mm from the factory. ;)
 

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I would only do .032-.035. A gap of .044 is too big for boosted motors IMO and is one of the main reasons 2.8s go through coils. GM later updated the HFV6 motor to work off .035 in the ATS-V and that made significantly more power than the 2.8 with no misfire or coil issues.
I am getting confused now. If I have a stock motor with no intention of tuning what gap should I be at?
See my previous post.
 

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Discussion Starter #14
All plugs replaced and one coil replaced. Runs like a champ now. Rear plugs and coils were not that bad to do actually.
 
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