Quote:
Originally Posted by dinfire
I get oil changes every 3500 miles. I've replaced the air filter twice. When I take it in for service I have them look at all the stuff you mentioned and they always report no issues. It goes into Nissan regularly. I don't think driving my car two miles a day at 30 MPH is "severe duty." I do get on the highway all the time to rev it good and blow out the carbon.
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Oil changes and air filters are one thing, but all your short trips are not helping extract the engine's potential. Review your service manual. IIRC anything under at least 5 miles is severe duty.
If you have an opportunity, pull off one of the maf sensors from the intake (don't disconnect any wires). I'm sure the backside will not be so clean.
Review page 9 of this pdf
http://www.nissanusa.com/pdf/techpub...2010_N_SMG.pdf
If you haven't already, try a bottle or two of chevron.