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04 GT codes

913 views 6 replies 3 participants last post by  straybullitt 
#1 ·
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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#4 ·
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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#6 ·
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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