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P0300 code

Old 10-12-2018, 02:10 AM
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I have a 2006 CTSV, I have kooks long tubes, high flow cats, running ngk 7 spark plugs as I am tuned to run a 75 shot. Car has been on a trailer for about 2 weeks as I have just moved cross country. Went to drive car to gas station and started misfiring terribly bad, I have never had a problem before with the car. And it just started throwing a P0300 code. Pulled all the plugs and they donít look too terrible and wires look fine. I am about to replace all of them. And every once in awhile I will mix a little bit of 110 with 93 gas. I know itís scrabbled but any options would be awesome.
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Old 10-12-2018, 10:53 AM
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I guess you know by now the P0300 is a "random misfire" code, which seems obvious. Check ALL loom connections, as a ground might have gone bad, just enough to not connect all the time, or a connector might be just slightly loose.
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Old 10-12-2018, 12:27 PM
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Ok so are you thinking all the connections In the engine bay
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Old 10-12-2018, 03:59 PM
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Originally Posted by Sharky92s View Post
Ok so are you thinking all the connections In the engine bay
All engine harness related ones, yes.
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Old 10-15-2018, 10:46 AM
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When your V sat for 2 weeks, what fuel were you using before it was sitting?
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Old 10-15-2018, 11:51 AM
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93/110
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Old 10-15-2018, 12:54 PM
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well your injectors shouldn't be clogged or dirty just from 2 weeks of sitting using that gas, that can be checked off the list.
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Old 10-15-2018, 01:06 PM
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Ya I didnít think so. But only thing was we were moving from va to Cali and I drained most of the gas out so it was on pretty much beyond E and I drive to gas station. So maybe it sucked sowmthimg up in fuel pump?
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Old 10-15-2018, 01:16 PM
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I doubt it, only things I can think of for a misfire are injectors, plugs, coils, connections or maybe a vacuum leak ? Im sure someone with more knowledge will jump into this thread!
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Old 10-16-2018, 09:38 AM
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Why are you running plugs that are two steps colder than stock when you only have a 75 shot? Honestly, with proper tuning, stock heat range plugs would probably work and be much better about self cleaning and firing correctly. Even splitting the difference at a 6 heat range would be much better for drive quality and plug cleaning.
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