Running Rich?
 

My Z seems to like/enjoy running rich. My exhaust tips get dirty fairly quick and I am wondering if anyone else is seeing this or not. The dirt is not slimy as burning oil would indicate; it is more sooty.

Thanks in advance and today is my 370's one year birthday.

you should take your Z out to a nice dinner tonight

:tup::driving:

mine runs rich! with test pipes my rear stays sooty all day. haha

I don't have hfc just cbe and my tips are always clean.

any symptoms
 

does it affect performance?

who does your routine maintenance? what do they think?

you should be running lean with test pipes...not rich...unless you had a tune done to make it run rich...

Don't worry about it. You can get a Scangauge or similar if you're concerned. No Nissan dealer is going to tell you anything other than "it's normal". They're exhaust pipes...you could run waaaay-lean and you'll still get exhaust grime on the pipes.

I am wondering if an ECU reset would change things.

Maybe check you air filters,maybe got leaf inside or dirty.?

Anyway most cars now runs richer.

you need a tune to fix AFR

I am going to look at my air filters tomorrow -- I am at 12,000 miles since I saw them last.

Soot is totally normal with TPs. You don't need to be running rich-- you can run really lean and still leave a ton of crap on your pipes and bumper. You will also often notice the bumper yellowing above the outlet over time.