I have a 2004 Nissan Titan 5.6L LE Crew Cab 4X4 automatic. Purchased it used from private owner who had all his service records. At 33,000 miles the check engine light came on; code scan stated "high idle RPMs". Dealer stated a Nissan tech. bulletin required a reflash of the computer for it to relearn how to idle. Just out of time warranty by 6 months; it cost me $200.
How did it unlearn how to idle? One month before engine light came on I cleaned the throttle body to remove grime using TB cleaner and paper towels. Ran fine for a month.
Maybe it is my imagination but it still seems to idle a little high; 650-700 RPMs. Fuel mileage seems to have decreased from avg. of 13 mpg to 11 mpg. Using brand name 87 octane fuel. Changed all of the fluids with Nissan fluids but still the same.
Idle is smooth, air filter is new and had been using Mobil 1 and tried Pennzoil Platinum with same results. Dealer serviced last time while in for idle RPMs and used Pennzoil regular oil.
Anyone have this issue with their Titan? Comments are welcomed and I thank you in advance. Guy