Have you checked your air filter recently? I just checked mine, it is very dirty, more so than my Murano with 50k miles on it. My JX only has 5k on it, and the air filter is almost black, what's wrong?
So you guys are refering to the cabin air filter right? These filters tend to get dirty real fast especially if you drive around construction sites. I replace mine every 6-8 months, I have kids so im more on the safe side. I could care less for myself but for childs sake right. These filters cost like $60.
I donot go very close to construction site, but my office is next to one, where I park. The thing is, it is really dirty in just 5 month, comparable to a 50K filter before. I suspect may be there is engin backfire or something that caused it to be dark so quickly. Will change it out soon.
Fuel injected motors don't backfire. Carbed cars could backfire because the intake runners between the carb to the intake valve would be filled with a combustible air/fuel mixture that could explode. Fuel injectors are right before the intake valve, it's just air in the runner, and it can't explode. There is a case of timing being waaaaaaay off, where the plug sparks on the intake stroke when the valve is open, and it can blast backwards. That would be an extremely rare anomaly, which would have thrown a check-engine code.