Yep oil is at full mark and always changed with full synthetic around 7000km intervals, car burns ~.5L (half way between max/min dot on dip stick) in the 7000km oil change interval. Timing chain recall was also performed by dealer back in 2017, reading the thread made me think it might be exhaust leak which then leads to the cat codes.reggiebrown40 wrote: ↑Mon Mar 18, 2019 6:39 amTlaspec, are you topped up on oil? If the car warms up and the oil is circulating properly I'd suspect that your oil needs to be changed or is low.
For a blanket statement, I agree...for our VK56VD motor, I'm not sure. Even though the manual says 0-10% ethanol, the oxygenated blends burn cleaner. Less carbon to the cats.
I will continue to use BP 93 oxygenated gas. I created a spreadsheet to document my ongoing P0420 issue. It popped up again at 100,320 miles. The CEL went out on its own (for the 3rd time) at 100,500 miles. For the second time, I did not add Cataclean. I will have to look at the spreadsheet to see the mileage when I stopped using the pure gas. Outside temps have an effect on A/F ratios. Cold air is more dense, so the engine will run more rich, more soot, etc. More chance of throwing a cat code if you're hovering on the edge of the efficiency threshold like I am. I know that during the warmer months, the car runs leaner, less soot on the tailpipes...less chance of throwing cat codes.EdBwoy wrote: ↑Mon Mar 11, 2019 9:53 pm...if you would like to help out and do an experiment and give us another data point like we did with UpRev earlier in the thread, I'd encourage you to keep using the non-ethanol fuel while armybrat goes with ethanol-added fuel. After a while you and he can compare notes.
I do not think any damage has been done by the fuel, but I recall you mentioning that the code came when it got cold outside. If this issue is triggered mainly by outside temperatures, then these next months might be tricky to collect good data since it's warming up. Maybe temperature is the reason armybrat's code has stayed off so far? (Not sure what the ambient temperatures are where you are Sir)
You're right, I'm not sure why I made that statement. I was conversing with someone on my cell phone about the crossplane firing order and its effect on scavenging and sound signature. I meant to answer that person's exhaust question, not respond to your statement - sorry 'bout that LOLEdBwoy wrote: ↑Mon Mar 11, 2019 9:53 pmI apologize if I misguided you on that matter. I do not think there is anything wrong with the firing order that Nissan has used since at least 1989. I think the issue is structural - probably a crack in the manifold, or even a faulty catalyst element; none of which we can confirm without a visual observation. However, the ethanol vs. non-ethanol experiment might help shed some light.
Frog, interesting indeed. Does your light usually go away by itself or do you manually clear it and it stays off until the next fill up?
Spoke too soon. CEL came back on my way home from church. I'm starting to think it is REALLY sensitive to temperature. The wind picked up in the early afternoon as opposed to the morning so that my have put the temp down just a smidge.Ilya wrote: ↑Sun Apr 14, 2019 8:48 amIt's gotten a bit warmer here and we're pretty regularly in the 50s now. Yesterday it was near 70. I had filled up the day prior with 91 non ethanol. My CEL has been on for a few weeks or maybe even months.
Well, after doing a 5hr round trip to Syracuse, NY and hitting 120kmi in the process...i filled up again with 91 non ethanol when I got home last night. This morning my CEL was off and all diagnostic tests are complete.
I'll keep an eye on it. It's about 60 today. The only other thing I did was added half a quart of oil before I left on my trip. I'm at my OCI but my dad's garage has a taken apart car on the lift so I haven't been able to change my oil yet.
Most 'experts' will tell you that catalytic converters - on ANY car should last for the life of the car. BUT, they don't don't tell you how many years or how much mileage is considered 'the life of the car'. It is NOT a planned repair at any age or mileage. It is also not included in maintenance schedules. My CATs went just after 100k miles and 9 years on my M35. I know a mate with an original Q45 and 230k miles that still has the original CATs with no issues. From what I read whilst coming to grips with my bloody expensive repair has not taught me anything conclusive. No single thing that we can do to extend the life of the CATS, but there are things that experts 'suspect' can have an effect on the lifespan:cejac63 wrote: ↑Tue Apr 16, 2019 2:56 pmHello. Fill disclosure ...I do not own a M56 or M37 but the M56 is one of the cars that I am researching for purchase more so than the M37. I have a question about the issue with the catalytic converters for the M56. Is the failure of the cat inevitable for this particular model and years(2011-2013) with higher mileage or random("you just got a bad one"). From what I am hearing $3000 for replacement is a lot. Also how many forum users have had to replace their M56 cat or did they decide to get rid of it. Please advise. Thanks.
So far, mine is still coming on intermittently. This past Friday, my CEL was on. I decided to clean my air filters (which were dirty BTW) and also reflash my custom tune. Started the car to move it and the light went out. Moved the car to the left side of our garage, and turned it off. Just out of curiosity, I hooked the scanner up, and the P0420 code was gone. Usually when the light goes out, I still have to clear the DTC with the scanner. However, there was a U1024 VVEL CAN Communication code showing:Ilya wrote: ↑Fri Jun 07, 2019 7:16 amMine has been on solid now for a few weeks. Been trying to use the same gas if possible, etc. I did clear it one day when I went through a car wash as I didn't want to be embarrassed, but it came on shortly after lol. I think at this point I'm SOL and need to pony up for the fix by October as I will not be able to pass inspection this year.
My CEL hasn't come back since I posted about the reflash. (about 800 miles) I believe the hotter weather helps, as there is less soot at the tailpipes compared to the cooler months.