2004 suburban z71
198k
I just got this truck a month ago. I changed new sparkplugs ac Delco.
I had a knock sensor code also when I bought the truck, prior owner said he replaced the mad sensor also.
I ran 2 full tanks of e85 then I got a p0300 misfire. And a knock sensor code.
Stuff I've done so far
new coil packs, sparkplug wires, air filter, fuel filter. I put 87 octane with half a tank left of e85 and I out seafoam in the gas tank.
I checked all the wires and all grounds. I even pulled the 02 sensor to see if cats were clogged no luck truck still misfires...
Quick view
Ran 2 tanks of e85, got p0300...
My last guess is a clogged fuel injector?
198k
I just got this truck a month ago. I changed new sparkplugs ac Delco.
I had a knock sensor code also when I bought the truck, prior owner said he replaced the mad sensor also.
I ran 2 full tanks of e85 then I got a p0300 misfire. And a knock sensor code.
Stuff I've done so far
new coil packs, sparkplug wires, air filter, fuel filter. I put 87 octane with half a tank left of e85 and I out seafoam in the gas tank.
I checked all the wires and all grounds. I even pulled the 02 sensor to see if cats were clogged no luck truck still misfires...
Quick view
Ran 2 tanks of e85, got p0300...
My last guess is a clogged fuel injector?