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Heavy Isolated Misfire Under Load

What if his roller lifter collapsed? I would check that out before pulling the head.

I have 4 LS7 lifters if you want them Joe if that is what it ends up being.
 


Drunkie said:
What if his roller lifter collapsed? I would check that out before pulling the head.

I have 4 LS7 lifters if you want them Joe if that is what it ends up being.
Click to expand...

Wouldn't I hear some kind of ticking if the lifter collapsed?
 
Got the head off woooo.

No damage to the piston wooo. They sure look ugly though.

I haven't got a chance to remove the valve because I forgot my spring compressor at home.

i also manage to break all the rear injector o-ring retainer things.

I'll post pictures when I get home.
 
Sorry, my camera is a potato

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Here's the suspected bad valve. It has a burn mark on it.

Also I cleaned the new head surface with a wire wheel. Did i **** up?
 


put that valve in a drill, and spin it. you'll know asap if its got a bend or not.

the lifter could be jacked up too. maybe worth changing it while its open.
 


Car is running like complete ****. I have several codes. I think I ****ed up the wiring harness because the trans is whining.

Oh and that miss is still there when I give it quick throttle.
 
p0118- High coolant temp ; i broke the temp sensor

p0560- System voltage > 16; It was like 18-20v wtf

p1115- coolant temp sensor.

p1635 "5V Reference (B or 2) Circuit" ?


I also noticed the PCM isnt telling me its misfiring, but im pretty sure it is.

 
Last edited:
Okay I fixed all the codes. Its because the coolant temp sensor was smashed leaving only the three prongs left.

I connected its wire on the harness to the three spring wrong.

Anyway it still misses. All that work for nothing.
 
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