Jump to content

P0300

leathermaneod

By leathermaneod
in Troubleshooting & Recalls

 Share

Recommended Posts

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.

  • Thanks 1
leathermaneod Enthusiast

leathermaneod

Posted
  • Author
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.

  • Thanks 1

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Latest Articles

  • Posts

    • Chuck FB
      Towing In Loose Gravel

      By Chuck FB · Posted

      I agree, there is no one answer fits all as every rig is different, one may be pulling some little aluminum fishing boat while another is towing a monstrosity that weighs a lot and hopefully the owner if the rig has some prior experience to know what drive mode they should choose.    It also struck me and this is from watching a few of those boat ramp escapades videos in the past, Ford being one of the vehicles that has the auto front axle hubs and sure enough its found out that one hub has crapped out and won't engage and may not have manual hubs to even select on both sides so they are on the boat ramp stuck with no four wheel drive and spinning .... they flat out need a tow to get up the ramp and deal with the vehicles new found issues. That can happen to all brands of pickup, finding out either four wheel drive or 4 low isn't working right at the time its needed it to work as some electronic crap has failed. 
    • Chuck FB
      Towing In Loose Gravel

      By Chuck FB · Posted

      Its possible you never had the joy of the crappy boat launches we tend to have around here or really some of them are just grades down to the river if its a river scenario and the conditions change all the time with the river levels and silt deposits. Some of the lakes we went to years ago, there was no such thing as a cement pad that went down into the water that the trailer stayed on, it was gravel maybe up to the water line and then duck crap much beyond that so sinking the boat tires into mud. Of course some of the more established lakes had a cement bar type boat ramp but sometimes it was covered in green slime closer and certainly within the water and a two wheel drive had all sorts of fun if one had to touch that slime with the rear tires.    A neighbor of mine had made a comment years back with his chev truck that was probably about the same year as yours but a half ton extended cab 4x4 and he a a fiberglass boat with an inboard so it wasn't a feather weight and he had gone out to one of the large popular lakes in the area and don't ask me how this happened but he was in two wheel drive as he figured he didn't require four wheel drive for that boat ramp and somehow upon pulling the boat out he twisted one of his drive axles. I suspect it must have spun and then grabbed on the cement ramp and shocked it to the degree of twisting it. He would have had the standard 8.5 or whatever it was axle housing as the 9.5 ring gear like my truck has also has larger drive axles as far as I know. Anyway he was feeling a vibration driving home and had it checked out and a shop found that the tire/hub was wobbling because of the axle had twisted so in went a new drive axle. After that bad experience he said he made sure to put it into four wheel drive to lower the stress on the rear axle. Of course that is where an HD truck can handle a lot more stress and no doubt these newer half tons with their larger ring gears probably have larger drive axles as well to match vs back in the day. 
    • asilverblazer
      2027 GMC Sierra: Official Discussion

      By asilverblazer · Posted

      Desirable - as in does someone WANT one, aspire to have one. Could reasonably buy any car they want and CHOOSE these instead.    I didn't watch the video, why did they win?
    • Atlas
      Towing In Loose Gravel

      By Atlas · Posted

      The use of absolutes like "always" to describe gear selection, and giving free advice at a boat ramp sounds like a recipe for disaster. It's a boat ramp, not a farm, for starters.   IMO gear selection should depend on the obstacle. If low range is working and this is a slower speed, controlled ordeal, I'd keep using that.
    • diyer2
      Towing In Loose Gravel

      By diyer2 · Posted

      I had a boat for many years, never had a problem even with a 2 wheel drive 93 Silvy for 20 years. Good tires, proper use of the gas pedal worked.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...