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Old 05-18-2015, 09:43 AM   #1
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04 GT codes

Pulling p0300 and p0316. It's a misfire, correct? One code says misfire at start up but doesn't feel like it's missing.

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Old 05-18-2015, 12:31 PM   #2
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Probably a bad coil pack


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Old 05-18-2015, 12:55 PM   #3
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Yep. Misfire.
First, check your charging system.
If that checks out good, start with checking for vacuum leaks of un-metered air entering the intake.
Also, any or all of the basic tune up items can cause these codes.
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Old 06-15-2015, 05:06 PM   #4
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Checked my charging system. All tested good. Changed out plugs and runs a whole lot better but still having the random misfire code at start up (3000 revolution). Tested fuel injectors and they came out good. I guess I'm down to the coil packs. I can hook a voltmeter to coil pack and test like that? Because my car is cam and i cannot tell by unplugging 1 coil at a time.

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Old 06-15-2015, 05:11 PM   #5
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You need a more sophisticated piece of equipment, to test the coils, than a multimeter.

Did you check for vacuum leaks?
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Old 06-20-2015, 11:34 AM   #6
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No, haven't checked for vacuum leaks. I switched over to 93 octane and no codes are popping back up. And idles a lot more better than it did. I don't know if it affects from 87 to 93. I bought this car used so i couldn't tell you if it has been tuned or not but by switching to 93 i think it does. It also has LT headers and cams if that affects anything.

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Old 06-20-2015, 11:54 AM   #7
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The car must be tuned if it has anything more than what would be considered as "stage 1" cams.
I wouldn't have thought that too low of octane would cause a misfire but if the code has gone away... Then it's fixed!
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