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P0300 code without check engine light!

Old Mar 7, 2016 | 06:48 PM
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GS13
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Default P0300 code without check engine light!

Hi Guys,

I did heads and cam swap a month ago and the car run fine. However, I checked for codes and I got P0300( random misfire). I changed plugs and wires but its there yet. I noticed that at high RPM I get a whistle sound, I think from back of the intake. Is the code because a tune that it supposed to tell the engine there is a cam or something like that? Did anyone have the same issue? BTW, the heads are trick flow and the cam is not that big!

Thank you
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Old Mar 7, 2016 | 09:12 PM
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You may need to do a crank position relearn. It solved my P0300. I used EFI live.
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Old Mar 8, 2016 | 10:43 AM
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yea bro you have to mess with the tune because of the cam the motor thinks its detecting misfires i think what is happening is the tune was just set to not set check engine light for p0300 but its detecting the error
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Old Mar 8, 2016 | 02:40 PM
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A whistle sound use to be/could be associated with a vacuum leak. Not sure if it happens too much anymore though.
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