I only get 250 miles per tank from my 2001 Nissan maxima.
I have a high flow intake and cataylic converter in which I thought I would see a change in my gas mileage. I have had a tune up and made sure tire pressure is good.
I noticed this change when the dealer changed the computer system 3 years ago however I have taking it back and they say it's not a problem. Can someone please provide feedback.
CURIOUS IF YOU ARE REFFERING TO THE ECM UPDATE THEY OFFERED FOR FREE ? IT WILL REALLY MAKE YOU WONDER? CHECK YOUR MASS AIRFLOW SENSOR- IF YOU GET A DTC THAT STATES YOUR TOO LEAN TO SYS BANK 1 REPLACE- BE CAREFUL THOUGH THE MAF SENSOR CAN BE EXPENSIVE-ORILEYS SEEM TO BE THE CHEAPEST AND DO NOT BUY THE SENSOR WITH THE HOUSING. 419.00 VS. 180.00 ITS ONE CLIP AND I BELIEVE 2 SCREWS. VERY TRICKY CAR SO BE CAREFULL . ITS A VERY DETAILED PROCESS THAT HAS TO BE FOLLOWED SO IF YA ARENT WILLING TO RISK IT TAKE TO
A DIFFERENT NISSAN DEALERSHIP ASK FOR AN ESTIMATE FOR REPAIRS AND A PRINTOUT OF ALL REPAIRS MADE BY NISSAN- FREE AND VERY GOOD TO HAVE- TRY THESE AS I HAVE AND SEE IF YOU GET ANY RESULTS;
CHECK BELT TENSIONER...
CLEAN FUEL INJECTION SYSTEM.
UPDATE YOUR ECM TO ACCOMODATE NEW INTAKE AND EXHAUST
REPLACE MAF SENSOR-
CHECK EHAUST FLANGE- MOTOR IS KNOWN FOR ITS ABILITY TO PRODUCE EXHAUST MANIFOLD LEAKS- WITH HOOD UP ITS THAT PUTTER SOUND NOT VERY LOUD AT ALL BUT GAS MILAGE IS REDUCED
CLEAN GAS TANK
GET GAS AT ANOTHER STATION- I FOUND THAT IF I SPEND THE EXTRA DOLLAR OR SO PER TANK ON 91-93 OCTANE MY GAS MILAGE PER TANK INCREASES 200 MILES EASY
CAR MANUAL EXPLAINS EVERYTHING SO IF YOU HAVE OWNERS MANUAL READ THRU TROUBLESHOOTING BEFORE SPENDING LOTS OF TIME N MONEY YOU DONT NEED TO . YOU HAVE THE ANSWERS IN THE BOOK . ALLDATA.COM HAS A GREAT MANUAL AVAIL ONLINE ALSO YOU MAY CHECK LOCAL LIBRARY. DO SOME HOMEWORK SAVE SOME MONEY
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Has the valve timing been checked? This engine has three timing chains and a very specific procedure for setting the timing. I'm assuming the engine came with heads, cams, and timing chains installed, but builders can make mistakes.
Start your car and with the hood open, give the mass air flow sensor a hard tap. If the engine stumbles when you hit it, the air flow meter is bad. It's located right after the air filter, inline with the air intake hose.
First off,do not install a cheap air filter,it will restrict air flow,use a napa gold,or equal ,You can change the oil,and use a synthetic oil blend,like castrol,it reduces friction.Add a good fuel cleaner,such as lucas fuel treatment.Also have a shop set the timing on the engine,over time,the timing will change,do to wear.Clean the air intake ,or throttle body,remove all the black carbon with a throttle body spray cleaner,or carburetor cleaner.
Try cleaning the mass air flow sensor. If you don't already have a Haynes Manual for yor truck, pick one up at a auto parts store. While at the parts store pick up a can of mass air flow sensor cleaner spray. It is diffrent than other cleaners. Mass air flow sensor is usually located somewhere in the air intake.The Haynes manual will help you in locating where it is. Do not use other types of cleaners on it as it could damage it.
i think i had the similar problem with my car. I'm tell what my car did and if it sound the same then do what i did. When you push the car hard usually beyond 3500-4500 RPM it would just sorta lock up. Almost like when you reach the Electronic speed limiter, which is 137mph on the maxima00-03. car looses almost all of the power and gains it back soon you let go of the gas paddle but same if you push it again.
i had to change Mass air flow sensor. There was a recall by nissan about this sensor. They would only fix it if your has less then 80k miles. If above this mileage limit you are out of luck. Sensor costs about 100 bucks. It is located right on the Intake pipe of the car. Which is that round black pipe. If you look at carefully you would see a sensor located right on that intake pipe after the air filter. May be around 1 foot apart from the air filter. you can replace the sensor by your self because there are only 2 screws you would have to open. very simple. My machinic had recommanded me to go get your car's computer reprogrammed after changing the sensor... but you don't have to because car's computer relizes the sensor change. i had to pay 60 bucks for dealers to tell me that you don't need to get your computer reprogrammed because it resets it self. Down turn........ this faulty sensor told my car after 80mph that car is not getting enough air in the air system and engine just would not generate as much horse power or reach its peak. so.....because of that my car gave very good mileage on the highway. I tested it out ... It gave me 454 Miles per tank before i replaced that senor. Now by replacing the sensor my mileage went down to around 375 per tank... this number is around what nissan claims. HOPEFULLY THIS HELPS YOU.... IT DID HELP ME.... IF YOU DON'T DRIVE FAST OR DO STUPID **** LIKE MYSELF.... DON'T REPLACE THE SENSOR AND KEEP GETTING THE GOOD MPG YOU ARE GETTING....