my 07 ss/sc is setting a #4 misfire code, plug keeps fouling out with oil
#1 cyl has 150psi compression and i have 85psi on #4
the idle is very rough
when i get hard on it, it pops the dipstick up and blows oil out the stick...
any ideas?

 

#4 rings are gone. Blowby.

 

I smell engine rebuild time.

 

Compression sucks across the board, time for some new rings

 

if its popping out the dipstick you have a busted ringland time for some pistons

 

Time to order up some Wiseco Forged pistons!!

 

Yeah these guys are correct. It just happened to me last month. Got the motor tore down and when i removed the 4th piston the ring fell in my hand in pieces. Now it's time to go FORGED!!

 

how much did it cost grand total for new pistons and install?

 

well i am gonna keep my mouth shut... hehe.... its going to the dealer on thursday it is still under powertrain warrenty.

 

I just saw a set of K1 rods and Wiseco pistons for $850 shipped. (Not LSJ but just saying there are some decent deals out there to build it up!)

 

better at least put your stock tune or gm stage 2 back on the car b4 u bring it in for warranty work. If its a blown piston there definately gonna check ur ecu

 

Good luck, I hope they will fix it.

 

wow thats crazy ... Same exact **** happened to me..
Anyway to remove the pistion without taking engine out..??

 

If you can get the head off, and the oil pan off, you might be able to take the connecting rod off the crankshaft from through the oil pan, then the piston and rod should come up through the top.

 

if you get gm sportcompact third edition it will show you how to do all that in the book

 

Yes you can that is how i did mine. The worst part is removing the timing.

 

Rods really aren't needed... The stock lsj rods were rated over 350hp, way more than what you establish with the M62. A nice set of forged wiseco or diamond pistons at stock compression will be all he needs.

 

**** on stock compression go up to 10 or 10.5 i went 10 and it was worth it

 

sub'd

 

Figure about $800 in parts (600 for pistons and 200 in gaskets/fluids) minimum, and the swap can be done in a weekend if you are mechanically inclined. Pull the head and front cover, drop the oil pan, pull the rod/piston out the top.

 

well got the gm stage 2 tune and pully back on ready to go to the dealer thursday morning

 

lol they can tell if the pcm has been messed with

 

you dont need to pull the front cover just use the timing marks on the balancer and the cover

 

Sure, you do that...

How do you know the chain is on the correct link/mark spot with the cover on? It takes 30 min tops to pull the front cover and put it back if you are already that far in. It takes many hours and more money to correct missed timing or possibly bent valves.

 

Agreed it took nothing to pull that cover off. Very simple and worth the time to do so.