Thread: P0300 Code
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Old 12-30-2018, 08:40 PM   #7
OutlawDrifter
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Join Date: Aug 2012
Location: Northeast KS
Posts: 1,775
Re: P0300 Code

I had a P0300 I chased on my LQ9 swapped Z28 for a year. Finally found it with a noid light set. Ended up being a fuel injector plug that had 1 strand of copper left connecting it.

I agree a faulty sensor could be the culprit. Grounds are a huge player in the LS engines as well, make sure they are all clean. Next place I would look into was plugs/wires.
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1999 GMC Suburban K2500 SLT, 454/4L80E
1991 Z/28, 6.0L/T56
1949 GMC 250, S10 Frame, 6.0L/4L80E

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