Friday, April 16, 2010

Low fuel mileage, Nissan Maxima

What should I do if my fuel economy is excessively low on my Nissan Maxima?

If your fuel economy is excessively low on your Nissan Maxima, your vehicle may need to be serviced or repaired. You may want to contact your Nissan dealer or a reputable repair facility to check your vehicle. The following are some of the diagnostic checks a mechanic will typically conduct for poor mpg on your Nissan Maxima:

Perform "On-Board Diagnostic System Check" for diagnostic trouble codes (sensors or actuators which may be malfunctioning)

Check for dragging brakes

Check transmission shift patterns for slipping, use of all gears, lock-up operation

Check ignition timing

Check owner's driving habits including A/C usage, hard accelerations, carrying heavy loads

Check emission control system

Check vacuum hoses for leaks, kinks, proper routing

Check tire pressure

Check fuel type, quality, and alcohol content

Check fuel pressure and fuel system for leaks

Check air cleaner element

Check coolant level

Check ignition system for wet plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits, cracking or improperly connected ignition wires

Check for proper calibration of speedometer

In extreme cases, there may be engine problems such as poor compression or faulty fuel injectors. Replacing fuel injectors on a Nissan Maxima is not for the beginner or backyard tech. It is advisable to take it to the Nissan Dealership or a repair shop that you trust.

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