Hello!
I have a 2017 honda CRV with the 1.5t Earth dreams engine with 102k miles. I recently bought a scan tool and noticed my LTFT and STFT are running a little over -11%. I looked up more about it online and every article states that anything above +/- 10% there is a problem: my car is running too rich.
I change my oil and filter every 5k miles. 2k miles ago I cleaned the MAF sensor with cleaner and used royal purple fuel injector cleaner, changed the spark plugs using oem, and cleaned all my filters (all part of my 100k maintenance). I uploaded a picture of my spark plugs with 100k here and Scotty said they looked great.
I have no problems with my car and wouldn't even know that these numbers are off if I never plugged in a scan tool. I am actually averaging 31-32 mpg in the city and 35-36 on the highway with awd so it makes sense my car is using less gas. I use a k&n cotton air filter, 0w-16 oil and drive in econ mode 99% of the time.
Should I dig deeper into finding out why my car is running rich as this is a problem? Or would this be normal because a combo of thinner oil, a cotton air filter, the software update honda used to reduce oil dilution and driving in econ that my car is compensating for it?
Thank you!
I would try cleaning off the MAF again, and switching to an OEM paper air filter and see if that helps.
You cannot use an oiled air filter with engines that have a MAF sensor. Dry paper filter only. Of course K&N won't tell you that. MMJoe has your solution.
Adjust the valves as well.
Is it too late to change the air filter as I have had it since the car was new?
I cleaned the MAF sensor and will change the air filter tomorrow. Any particular brand or oem air filter?
you can change the air filter any time you like.
OEM is a safe bet. I also like NAPA, Wix and Purolator.
Give the engine time to calibrate itself.