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2007 Solstice GXP Mysterious
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Discussion Starter · #1 ·
I know exactly what to do, I just have a couple of questions before I actually start.

1. How do I access the spark plugs?
2. What is the cylinder order? (The only post I could locate about firing order was 13 years old, and while it had the order, it didn't bother to mention which cylinder was which.)
 

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Discussion Starter · #2 ·
Okay, got the cover off, changed the plug, swapped the coils, still got the code. And the nasty idle. What are my next steps? There's no carbon buildup anywhere that I can see.
 

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Could be a multitude of things. If it's not the ignition try swapping injectors nd see if the code follows. After that I would check crank and camshaft sensors. After that a leak down and compression test would be in order. This is of course that you verified all electrical and vacuum connections are in good working order.
 

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Okay, got the cover off, changed the plug, swapped the coils, still got the code. And the nasty idle. What are my next steps? There's no carbon buildup anywhere that I can see.
When you say "swapped the coils" do you mean that you moved them from one cylinder to another? Is it still the same code?
 

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Exchanged the coils on 3 and 4. Same code.
Then my next step would be what @07 Boss suggested: switch injectors.

If you are only getting the P0304 it is almost always cylinder-specific to cylinder 4.

Now that I have thought about this, there was one group of cars that used the firing order for codes, and not the cylinder number. I will look for the TSB, but it is possible that your problem is not where we think it is, so switching the coils between 1 and 2 might be a logical step first.
 

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I have not found the TSB, but did find a reference to it. According to that reference, the LNF uses firing order and not cylinder order for the cylinder-specific codes.

That said, I believe that the firing order is 1-3-4-2, so switching components between cylinders 3 and 4 should still move the fault.
 

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Haha, I never knew the code was based on firing order and not cylinder designation. I would have been trouble shooting the wrong cylinder.
 

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Haha, I never knew the code was based on firing order and not cylinder designation. I would have been trouble shooting the wrong cylinder.
It varies by manufacturer, and even engine. From what I have read, the LE5 uses cylinder number, while the LNF uses firing order.
 

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Discussion Starter · #15 ·
I'm just grateful to the forum for giving me the idea. I'm an old school kind of guy who remembers the cylinder numbers on the N* were engraved in the valve covers and that was that.
 
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