P0300 misfire help

[Tmoney10]

I got the plugs off eBay ac Delco but could be knock off china parts also, I'm guessing.

Gonna do a compression check this week

 

[Tmoney10]

1- 150
2-150
3- 153
4-120
5-152
6 cyl had 0 compression
Gonna take apart the head and see any damage these were dry numbers

 

[OR VietVet]

4 and 6 are next to each other. First thing is to remove the cover and look in to see if you see any problems with the rockers and push rods. Take pics thru the whole process to show what you find and help others.

 

[Tonyrodz]

1- 150
2-150
3- 153
4-120
5-152
6 cyl had 0 compression
Gonna take apart the head and see any damage these were dry numbers

That sux!

 

[corvette744]

1- 150
2-150
3- 153
4-120
5-152
6 cyl had 0 compression
Gonna take apart the head and see any damage these were dry numbers

Did you do 7 and 8-i would do a leak down test if you have an air compressor.You will no closer whats going on without removing head.I for sure would check rocker arm,push rod and valve spring or valve .But removing core from compression tester and injecting air in the cylinder with both valves closed will reveal the problem.Intake,exhaust or piston.Possibly head gasket but it looks doubtful.Good luck Bro

 

[Rocket Man]

Hoping for the best and following.

 

[Tmoney10]

So I'm still working on the car just been super busy someone hit my 14 day old model 3.... Super pissed waiting on insurance..


Well I'm looking at getting some long tubes now also and what can can I run?


I'm kinda new to doing more mods but I herd btr stage 2 cam is legit what engine management do I need and what else?


Here is my model 3 most likely salvag

 

[Monkeywrench78382]

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?

Shit fuel even though the truck says flex fuel its NOT flexible on fuel. My Yukon goes all wonky on fuel trim long and short and idles horrible trips mil for 02 sensors (all) uncle Joe is making the cost of gas so high can barely afford to drive. 02 fuel trim will cause the stumble and random misfire, cat threshold , 02 sensors bank1 SEN 1 bank 2 sensor 2 ect.

 

[corvette744]

So I'm still working on the car just been super busy someone hit my 14 day old model 3.... Super pissed waiting on insurance..


Well I'm looking at getting some long tubes now also and what can can I run?


I'm kinda new to doing more mods but I herd btr stage 2 cam is legit what engine management do I need and what else?


Here is my model 3 most likely salvag

Might want to wait on all the mods untill you see if your engine is blown up or not.Then you can do it out of the vehicle.

 

[Tmoney10]

So all valve's are messed up cyl 6 is toast and cyl 7 ring's are gone .. gonna rebuild the whole bottom end and top end...


So looking at getting some mods in while I have the motor out. This is a overland vehicle and nothing crazy family hauler etc... Should I keep the egr system or delete it? I found 2 pairs of headers also one with the egr but the driver side headers looks really funny.


What's a good small cam and what engine management do it need?