06 fx35 catalytic converter glowing red hot

[guitfiddler]

Hi Guys, been working on my daughters fx35 chasing a misfire. Seems like I finally got it sorted, however now the driver side cat is overheating. There is no misfire code confirmed or pending. I can smell the unburned fuel so I believe this is causing the cat to over heat and not a bad cat since I have just done a bit of work I am thinking I may have either done something incorrectly or a part is not playing nice. The misfire started after changing the plugs and coil packs Here is a list of what I have done:

2006 Fx35 w/ 230kmiles
New throttle body - hitachi - throttle body relearn done
Plugs NGK iridium - didn’t play nice so swapped with NGK platinum
New coil packs - aftermarket from Amazon - didn’t play nice swapped back to original
New OEM valve/rocker covers - oil in cylinder 5 spar plug tube
Refurbished Bosch fuel injectors - took care of the misfire - idles good but running rich
New cam/crank sensors - Amazon aftermarket - crank was bad so swapped all for hitachi sensors - still having a P0335 code - swapped back to original - runs better but still the p0335

Not quite sure where to go from here - after I changed the throttle body everything started acting up. Appreciate any help you can offer…

[VStar650CL]

Most Nissan ECM's get spark timing from the crank but injector timing from the cam, so it's unlikely the persistent P0335 is causing a raw fuel problem. Check those new injectors, I have a sneaking feeling you'll find one stuck open or badly-sealed.

[guitfiddler]

Appreciate the reply. Wouldn’t an open injector throw misfire code though? I did have the raw fuel burning before I changed them. Currently I have no misfire code and it runs smooth at idle. The CAT that’s over heating is on bank one. Would the MAF or a bad O2 sensor throw off the mixture?

[VStar650CL]

Leaky injectors only cause misfires if they're severe enough to flood the spark plug, otherwise you just get lots of soot and lots of HC hitting the converter. If an A/F (front O2) is lying badly enough to cause a hot cat, it should also be causing codes, but you can diagnose most of that by looking at the A/F sensor outputs versus the STFT's. If the STFT is way negative but the A/F shows way rich, you probably have too much fuel coming in for the ECM to compensate, meaning an injector leak or high fuel pressure. If the A/F shows stoichiometry (normal) but we know from the cat that the bank is rich, then the A/F is probably bad. The A/F's on your FX are the early style. They read 1.5V at stoichiometry, lower voltage is rich and higher is lean.

[VStar650CL]

PS - With only one bank acting up, you can pretty much rule out problems like the MAF or anything else that would affect both banks equally. On a dual-MAF ride that would be a different story, but when there's only one it will affect both banks.