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P0300

leathermaneod

By leathermaneod
in Troubleshooting & Recalls

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leathermaneod Enthusiast

leathermaneod

Posted
Posted

Hi all,

 

I have a 2018, 1500, double cab, 6.5’ bed, 4x4, 5.3, with 144,000 miles on it. I got it at 132,000 and it seems to have been very well taken care of. I put new oem plugs and wires on shortly after buying it. It runs and drives like a new truck and the only real mods are a Diablo, but only to remove afm and bump drive idle rpm up a little. Tonight I saw the CEL for the first time. It flashed a few times, then shut off, then flashed a few more times, then shut off and stayed off. I was driving around 55, cruising with light throttle input. I felt zero hesitation or roughness, not a blip. I researched it while eating dinner and understand it is likely a misfire code, but I certainly didn’t feel anything. I pushed it some on the way home, a few hard pulls, couldn’t get it to flash again or act abnormally. I read the codes when I got home and only one is pending P0300. I’ve briefly read all about what the problems could be, but I’m interested in hearing what everyone recommends that I do now? I have no warranty. I’m not looking to turn this into something major if I can help it, but I depend on this truck and want to take care of it. What can/should I do while waiting for more codes to help point me in the right direction? Maybe fuel system cleaner or higher grade gas to help clean things out? Should I do some type of intake cleaner like Seafoam? Or do nothing till I get more info? 
 

I just realized one other weird thing that happened today. My Bluetooth hasn’t worked for months. Today when we got in the truck to leave, it started pairing with mine and my wife’s phones again. Maybe it’s just an electrical gremlin lol. 
 

thanks in advance for your recommendations! 

CamGTP Senior Enthusiast

CamGTP

Posted
Posted

You kind of need to see what cylinders are misfiring to really chase the problem. The P0300 is pretty generic and a live data scan tool seeing the misfires in real time would tell you what cylinders to look at.

 

Fuel system cleaner and that sort of stuff never hurts anything but may not help either.

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leathermaneod Enthusiast

leathermaneod

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Posted

Thank you for the input. Kinda what I expected to hear. It kills me to have to wait for a problem to resurface before I can do anything about it lol. 

mikeyk101 Senior Enthusiast

mikeyk101

Posted
Posted

I've always been happy with Chevron Techron. I usually try to wait until I have a longer drive to take, wait till tank about half full, dump whole bottle in and drive down to about 1/8th of a tank. I do like seafoam as well and always have several bottles on hand but use it mostly for my lawn mower, snowblower, generator, woodchopper, etc... I normally put several oz in 5 gal gas can and fill it up with gas. As I don't always use it right away, it kind of pretreats it so gas is still ok when I use it. It would probably work fine for the truck as well. 

rlcole321 Enthusiast

rlcole321

Posted
Posted

First question, are you sure that code wasn't there before the flashing?, like Cam said it is a random mis-fire code, I'd clear it and see if it comes back shortly after.  As for the injector Maintenace, "In the tank" cleaner is a good idea, but since it is direct (inside the combustion chamber) injected, the intake valves have no cleaning method, Seafoam makes a great product for that, with a special designed sprayer, it goes between the intake duct and throttle body and cleans the intake system, look it up on YouTube, with that milage my need more than one treatment. Also I know the AFM is disabled, but the collapsible lifters are still in there and can cause some misfire issues, just listen closely foe any "Ticking" sounds with the hood up, you may not hear driving.

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