Update: well finally good news! Talked to a shade tree mechanic friend of mine and he recommended that maybe catalytic covertor might be plugged. Unbolted from exhaust manifold and dropped down. Fired it up and headed out, will fry the tires now. So will be removing and core them out and put...
Ok, after yanking the engine again, before I removed the heads, I removed rocker arms and pushrods. I decided to run another leak down test, still have a few cylinders leaking through intake valves (can hear it) is this acceptable?
Note: i did another compression test after adding a little bit of oil to cylinder 5 and compression increased to 150 psi, isn’t that a sign of poor rings
Ok guys, this is update after checking compression, all spark plugs were new when engine installed. As you can see all the plugs on1,3,5,7 look like they have never fired or just very clean compared to the others, anybody ideas?
I have a 2006 5.3l that I put a new rebuilt engine in due to very high mileage and bad camshaft. afrer re-install engine has misfire on cylinder #5, (according to Chevy house, they performed compression test and all cylinders seem ok, they changed coil packs (interchange with other cylinders)...
