Misfires on cylinder 2, 4, 6 VVT with multiple codes

Hey folks, thanks for the look see,

- 2002 Toyota Avalon 3.0

I will go ahead and upload the report of the DTCs that came up when I scanned this car, but my priority is focused on the misfires on cylinders 2, 4, and 6, which are all on the same bank controlled by VVT.

About eight months ago, I also had misfires on 2, 4, and 6.  After some research and diagnostics, I determined that it was a dirty VVT oil control solenoid.  I cleaned it with some brake cleaner, reinstalled it, and the misfire codes (and glowing catalytic converter, ha) were gone.  

So, showing those same codes (with some new codes), I ordered a new solenoid and was going to install it, but after checking the solenoid that is currently installed, it had continuity.  I probably will swap it out with the second VVT solenoid as maybe it is intermittently failing.  

The reason I am thinking it probably is not that is because of some of the new DTCs which pulled up which are - Igniter Circuit #2, #4, and #6.  So I am then thinking, perhaps they are tied into the same circuit going into the ECM and that is where it is failing.  They look to be on separate circuits, so probably not a failing ECM.  Then I am thinking a timing issue.

I just looked up another code on Mitchell 1, and, although it doesn't actually show the specific code scanned (P1354), it does show P1350, which mentions the VVT sensor for camshaft position.  It seems logical that it could throw off the whole bank igniter circuits.  How would I check this without a scope?  I only have a meter and test light.

Another is P1150, which is A/F ratio sensor stuck at 3.3 v, which indicates possible open.  Could an open A/F sensor cause the misfires?  But why would the VVT sensor (P1354) scan.  I do have a coolant issue, which it says could be related to that.

Things I have done:
- disconnected coils and did notice a loss in power.  So apparently, the misfires are intermittent (intermittent misfires did scan as well).
- checked VVT oil sensor for continuity.  There was.
- quickly sprayed brake cleaner around the engine bay.  I did not notice any change in power (although I will give it a more thorough spray tomorrow). 
- purchased a one month subscription to Mitchell 1, and I have been researching the wiring, codes, tips, etc.  
*that is all I had time to do today   EDIT: Oh yeah, I also reached out to all of you knowledgeable individuals through ScannerDanner's awesome site and forum !

Like I mentioned earlier, I will upload the DTC report along with some screenshots of live data and diagrams.

Any suggestions or tips would be highly appreciated.

Thanks,
Michael


 

Instead of trying to eat the whole cow in one bite, I'll make a sandwich or two until it's gone.
I would clear the codes and troubleshoot the ones that come back first.
You have a new solenoid, I wouldn't be too proud to change that part, take it for a ride and see what crops up.