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?
I have a 2005 Silverado and I have a problem with it being in auto 4wd as soon as I start the truck some mornings. I have a brand new dash actuator and transfercase actuator on the transfercase. I just fixed some of the wires that were exposed for the 4wd. I still can't figure out the problem.
New to the forum. I installed a train horn behind the front bumper and removed my lower air dam. Things is, I want to replace that black Sierra plastic skid plate with the =Denali Chrome one. Give the front end a beefier front end... I will try to add mock up pics from my iphone. Anyway, I got the lower dam off, piece of cake. Got all but two screws from the upper plastic skid plate. The other two screws are almost impossible to reach. HAs anyone tried to remove this thing? https://www.generalmotorspartsonline.com/oem-parts/gm-skid-plate-23243492?origin=pla
I am really hoping I don't have to remove the front bumper,m valance trim etc just to get at those two screws. Anyone done this before? any ideas? Thanks in advance!
here is the phtoshoped version of what i am trying. The white letters for gmc i already did with reflective vinyl, looks cool at night when lights hit it! Plus it matches the truck. I did the rear as well
By Jett Gould
Ok, so here's the deal my truck keeps throwing the P0300 code (multiple cylinder misfire) and we can't figure out what is wrong with it. We've changed the knock sensor, the crank position sensor, changed the whole distributor to a MSD billet distributor (street fire model), changed plugs and wires, changed the coil. None of them have changed the fact that it keeps throwing this code. I also have the upgraded acdelco Spyder injection system. The motor is a freshly built 383 stroker built by a reputable engine builder when we first started the truck it ran like shit so we sent the computer to blackbear and had it tuned to the motors specs. When we got the tuned computer it in the truck it ran a hell of a lot better but it still keeps throwing this code. If anyone can point me in the direction of what could possibly be wrong or point me towards a good tech for these truck it would be greatly appreciated.
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