My repair that is making things worse! p0420 Code
Hello everyone! I have only had my Murano for maybe a month or two, but I am not stranger to Nissan. I work a lot on my 1994 300zx TT, but I leave that in the garage in the winter and I am finding that working on this newer Murano is much more difficult than even the Z that people say is the worst.
The car is a 2005 Murano SL AWD. I received it from a family member who mentioned that he did not want to keep up with its oil consumption so I got a good deal on it. It seems to drive great, no issues that I can tell even in the snow up in the mountains with some studded snow tires I got for it.
So far I have Changed the oil and filter and Changed rear PCV (It was recommended that this is the one to change for oil consumption issues) and I installed a catch can on that line to see how much oil was getting sucked in that way. I verified the catch can sealed well and had media for the oil vapor to collect on just in case. It has remained empty for maybe 300+ miles, though I work from home so I don't drive it that much.
The car almost always smells like burning oil inside. I freaked out thinking that it could be the transfer case/CVT seal right above the exhaust like some people have an issue with. I didn't see much of an active leak on the TC, just a little MILD wetness where the fill and drain plugs are, not fresh. I plan to drain and refill the Transfer Case with the Redline GL-5 75w-90 gear oil I used for the Z32's rear diff. I know on my manual trans in the Z I have to make sure to use GL-4 as GL-5 will eat the softer metal on the synchros. I don't think that is an issue here with the transfer case but I had a hard time finding an answer to that question anywhere. I did see a leak on the CVT side at the axle. I attached a picture that I scaled down to get it to attach. It looks like the CVT to CV Joint seal. I checked the CVT oil according to instructions by warming it up on the street and then selecting each gear and then back to park with the engine on I checked it. It was EXACTLY at the hot notch. So if it is a leak, how is my fluid level so perfect? It would have to be a really small one. The only other fluid leaks are the power steering hose like like every Nissan I have ever owned and possibly the rear valve covers, though I am not sure since I haven't taken the intake manifold off too look, I only looked at the small corner of it and it seemed like it was moist.
I received a P0420 code a couple days ago, which is the catalytic converter below threshold. I got worried because I know that they way Nissan does their valve timing (Mostly an issue on the 2.5 liter, but i heard it can happen on the VQ), it could get pieces of the catalytic converter into the cylinder and screw it up. So I took off both converters and noticed that the one nearest to the firewall was falling apart, sliding down in the housing where it was supposed to sit. While I did this repair I had to remove the heat shield on the front exhaust manifold. One of the bolts that held it on was really close to the low pressure line for the AC. I BARELY bumped it and wouldn't you know it, all the coolant leaked out of the connection between the hose and the compressor. Is this a common issue? Did I break something? I barely moved it. I will buy a new hose if need be, but the bolt that held it on is still tight. Maybe it bent? I don't know.
Maybe the oil burning smell is only from a bad rear valve cover gasket. I didn't want to pull the manifold but I do have the gasket if that is not reusable, I just need to find the procedure for this somewhere when I get the motivation. I have new plugs to put in when I do.
Thanks for reading my rant and ramblings.Any advice you can give to to restore my sense of accomplishment on this? I appreciate it!