Hello, I looked 2008 GMC Sierra 1500 that I was interested in purchasing with the 5.3L V8 has 174,000 miles. Truck runs rough at idle, rpms are fluctuating. Check engine light is on with codes P0300 and P0301. Can’t troubleshoot the problem. Coils, spark plugs, spark plug wires, new O2 sensors, new catalytic converters. Guy says that rockers all move so it isn’t Active Fuel Management lifters and he says 150 psi of compression across all 8 cylinders. Truck was at dealership, dealership says problem with cylinder numbers 1 and 8 the P0301 explains problem with cylinder 1 but why isn’t code P0308 being thrown? What else could be the problem?
Just wanted to relay a story in case anyone runs into this issue. Well, a couple weeks ago I did a simple pan drop, filter change, and added 6 quarts of Amsoil Signature series fluid. The truck was shifting really smooth and running great for about 3-4 days. After that I noticed a shudder at 20-30 mphs. Nothing major and it felt like it was coming from the back of the truck, so I assumed it was the rear wheels needing balancing. After more driving of the truck I slowly realized the shudder was likely due to the torque converter.
I had bought 3.5 gallons of amsoil fluid and had planned to disconnect the trans line and pump out old fluid and add new. I finally got around to doing that yesterday and drove the truck about 10 miles or so and have now noticed the shudder is pretty much gone. The fluid was extremely dirty but didn't smell burned and my truck is a 2014 with only 46k. For only 46k I felt like the fluid was way too dirty but I didn't feel the pan had an excess amount of metal shavings in it. I have never had a shudder develop after a simple fluid change but wanted to share this with anyone in case it happens. If the shudder doesn't completely go away I may end up (unfortunately) buy another gallon of fluid and exchange it out. However so far it seems like the shudder is gone or very minimal.
Here's my new to me CPO 2016 Chevrolet Silverado 1500 5.3/8spd LTZ w/ LTZ Plus Package and Z71 Package. Silver Ice on Jet Black
Here are pics the day I picked it up from Lone Star Chevrolet in Houston TX on Feb 28.
Mods are going to be the usual and will be listed below
Thanks for looking!
I have a question I just bought a 2018 Sierra 5.3 I got it with 260 Miles on it, never owned a new vehicle before so it seemed okay (they sold it to me as “New”)with me after taking it home I noticed my driver door wasn’t closing as smooth as it should for a brand new pickup, I saw a video where a guy was sold a “new” truck and it turned out to be a “dealer trade” and also he found out the truck had been wrecked before after finding pieces of glass in the truck , any way I became paranoid after watching this video and thought maybe mine has had a previous accident and the door not closing as smooth as I expect for a brand new pickup is a sign,figured mine had 280 miles on it, the door doesn’t close smooth, there wasn’t a window sticker when I bought the truck and maybe I’m just crazy but I feel like it doesn’t shift so smooth out of the first few gears (it’s an automatic), so naturally became more and more paranoid, so I got under the passenger side where door with the minor problem is and tried my best to find evidence of a previous wreck I saw a cable that was taped with electrical tape which looked fairly sloppy it split with another cable near the transfer case and it led to a connection adapter that was mounted on the chases of the truck and it ended right there at the adapter there was nothing connected to it so I was wondering is that normal? Like could it be there for some added accessories or am I missing something I don’t want to take it to the dealer in fear that they are well aware of an issue and won’t want to help, I already took it because the door not closing as smooth as the rest and they told me it’s a brand new pick up let seals break in and it shouldn’t be an issue, so please help . I’ll add pics to my profile for y’all to see because they’re to big to attach
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