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06 STS-V & 06 STS 4 (sold 2016)
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Annoying........ I had cleaned the MAF and got gas at a better station (I know the gas is not likely the issue) and P0174 went away for quite a while, but it came back yesterday.

Since it's only one side, I guess I'm leaning (no pun) towards loose intake bolts. Still runs fine. Whatever it is must just be on the edge of being an issue.

Any other thoughts? I still don't get why I never had this until the coil went out.

One thought I had was an O2 sensor or cat got damaged by driving for a little while with one cyl. not working, but I would think I'd have other codes as well.
 

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06 STS-V & 06 STS 4 (sold 2016)
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2,713 Posts
Man that's digging up an old thread. I'd forgotten I even typed all that. But I should have updated with the end result.

I ended up taking it to the dealer and they figured out by spraying carb cleaner that I needed some new gaskets that go under the Supercharger.

I've always wondered if really the bolts were just loose, but that's what they did (and charged a lot for).
 
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