Hey,
I've been researching my issues and it seems like I am always linked back here, so I decided to make an account. Going to give a back story if it helps any, and because I like to type. lol.
Last year, I bought a 2001 Chevy 2500HD 4x4 with a 6 inch rough country suspension lift and 36 inch military tires. Has headers, unsure of brand. When I test drove the truck, the check engine light was on, and the truck seemed slow. Being the dummy that I am, I thought it was just slow due to the large tires. Transmission gave out a week after I bought it, and I had it rebuilt. The guy told me the check engine light was on because it needed a tune up, so I told him if he performed the tuneup, I would buy the truck. He called me a week later and said he had performed the tune up, and sure enough, the check engine light was off. On my way home the check engine light came back on, I think all he did was unplug the battery, but I don't know. Also, I found out later that this truck was not treated well at all, so I have no idea what maintenance was done when, truck has 180k miles. IT also burns a quart of oil every 1000 miles.
So... I have that P300 random misfire code, which apparently, can mean just about anything lol! When I had a friend who worked at a dealer, we hooked up the truck to his machine. Rear 2 cylinders had a really bad misfire, and the other cylinders were misfiring occassionly. I pulled the sparkplugs, and they were worn out champions. I replaced with AC Delco. I have also replaced the fuel filter, the PCV valve (Which had ALOT of gunk in it) and checked the spark of the rear 2 cylinders using a spark tester. Spark was fine (Blue/purple). I've tried to run lucas injector cleaner, and seafoam, through 2 different tanks with no success. Right now, at idle, the CEL flashes. IF I floor it, the CEL flashes. IT stumbles really bad at acceleration. The rear 2 cylinders is where my biggest misfire is.
So, before I go on the chase of trying to get the truck running right, I wanted to make this thread to make sure I am on the right track. Right now, at idle, the CEL flashes. IF I floor it, the CEL flashes. IT stumbles really bad at acceleration. The rear 2 cylinders is where my biggest misfire is.
Plan: Test fuel pressure at o'rlys. Clean MAF sensor and throttle body with carb cleaner. Check the intake for leaks with carb cleaner. Check compression. Mail in the rear 2 injectors to an ebay seller who rebuilds them.
If there is something I am missing, or I should approach differently, please let me know.
Thanks!
Devin
I've been researching my issues and it seems like I am always linked back here, so I decided to make an account. Going to give a back story if it helps any, and because I like to type. lol.
Last year, I bought a 2001 Chevy 2500HD 4x4 with a 6 inch rough country suspension lift and 36 inch military tires. Has headers, unsure of brand. When I test drove the truck, the check engine light was on, and the truck seemed slow. Being the dummy that I am, I thought it was just slow due to the large tires. Transmission gave out a week after I bought it, and I had it rebuilt. The guy told me the check engine light was on because it needed a tune up, so I told him if he performed the tuneup, I would buy the truck. He called me a week later and said he had performed the tune up, and sure enough, the check engine light was off. On my way home the check engine light came back on, I think all he did was unplug the battery, but I don't know. Also, I found out later that this truck was not treated well at all, so I have no idea what maintenance was done when, truck has 180k miles. IT also burns a quart of oil every 1000 miles.
So... I have that P300 random misfire code, which apparently, can mean just about anything lol! When I had a friend who worked at a dealer, we hooked up the truck to his machine. Rear 2 cylinders had a really bad misfire, and the other cylinders were misfiring occassionly. I pulled the sparkplugs, and they were worn out champions. I replaced with AC Delco. I have also replaced the fuel filter, the PCV valve (Which had ALOT of gunk in it) and checked the spark of the rear 2 cylinders using a spark tester. Spark was fine (Blue/purple). I've tried to run lucas injector cleaner, and seafoam, through 2 different tanks with no success. Right now, at idle, the CEL flashes. IF I floor it, the CEL flashes. IT stumbles really bad at acceleration. The rear 2 cylinders is where my biggest misfire is.
So, before I go on the chase of trying to get the truck running right, I wanted to make this thread to make sure I am on the right track. Right now, at idle, the CEL flashes. IF I floor it, the CEL flashes. IT stumbles really bad at acceleration. The rear 2 cylinders is where my biggest misfire is.
Plan: Test fuel pressure at o'rlys. Clean MAF sensor and throttle body with carb cleaner. Check the intake for leaks with carb cleaner. Check compression. Mail in the rear 2 injectors to an ebay seller who rebuilds them.
If there is something I am missing, or I should approach differently, please let me know.
Thanks!
Devin