Quote:
Originally Posted by blue62
I hate to say it but I think you still have valve train issues on bank 2.
A leak down test only tells you if the valves and rings seal (or not) when the piston is at TDC. It is a static test.
It can't tell you if you have weak valve springs or lifter issues, or worn cam lobes, or...
You could do a vacuum test. It is an operational test. It will tell you how well the cylinders are filling with fuel/air mixture. Which is affected by any type of valve train issue. If a cylinder or cylinders are not filling with fuel/air properly it causes performance issues.
If the test is done correctly (and that is very important). It should give you a very good idea as to if the valve train on bank 2 is an issue or not.
Another (possibly) important thing to know is:
What RPM range are the misfires happening in????
Does it misfire in just a certain range like idle? or mid range? or high RPM?
Or are the misfires all across the RPM range??
Why did the head need replaced in the first place???
Did you ever have a misfire issue on bank 2 before replacing the head???
Edit:
Just re-read your posts.
What do you mean in post #3 when you say you "swapped" valves????
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Ahhh that's not what I wanted to read. I was kinda worried it might be a stuck valve.... but I the only test I saw online for a stuck valve was kinda simple and the car easily passed. Just holding a piece of paper up to the exhaust pipe.
Vacuum test seems like the key now! This same one that blue62 described? Teeing off a vacuum gauge into the intake plenum?
This is all happening at idle. Off of idle i don't think it misfires at all. Engine pulls strong too. The head was replaced because it cracked and started dumping coolant into the SAI port on the exhaust.
I swapped the valves from my old head onto the new one. Lapped them, did a leakdown test a few times since and it all seems alright. Rough inspection of the valve guides, valves, cams... nothing showed excessive wear... I really hope i didn't f that up.