badz24s

iTrader: (1)

alright, so the truck's almost 5 yrs old, has 21K miles & ran fine last night, but today it threw a code. Plugged up the autocal & found out it's P0300 only. no other codes.

I'm searching around, but while I'm searching, if anyone has any insight, please post it up.

Is this something that would be covered under the 5yr/100K powertrain warranty?

dewmanshu

iTrader: (4)

do you have aftermarket spark wires? a P0300 is usually associated with a spark issue. Unfortunately the 300 means random so good luck nailing it down to a cylinder. Make sure all your spark plug wires are good, plugs, boots, and so on. Reset and see if it comes back. If it does then move on to real troubleshooting. You don't have any other codes right? No lean or o2 codes?

dmelvin

iTrader: (8)

My truck used to randomly throw this code every once in a while, usually happened after I came out of the automatic car wash or cleaned my motor with water to a vacuum line. My dad's truck used to do it too. I'd clear it out and ignore it unless it starts coming up frequently.

Could be a spark plug, plug wire, coil pack, just to start the list.

texasglock23

iTrader: (1)

Even a faulty injector.

badz24s

iTrader: (1)

burnt #5 plug wire, I knew I should have spent more for the LT's without the hump

ForcedTQ

iTrader: (1)

Glad you found it. Now when you replace it install a nice thermal sleeve on it and configure it out of the way (use a tough zip tie?) of the header.

texasglock23

iTrader: (1)

What headers

badz24s

iTrader: (1)

I had a silicone sock on it, didn't burn the sock

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