Fuel
Injectors - Bad gas or regional mixtures tend to result in
early injector failures. A fuel smell in the cabin also hints
at injector problems. Non-OEM injectors are not recommended.
Learn how to test your injectors.
Fuel System -
Purchase a can of BG44k
from Infiniti of Scottsdale and add it to a 3/4 tank of gas.
Repeat this in 2 months. Chevron w/Techron can be used every
3000 miles if BG44k is not available. However, despite being
the best off-the-shelf choice, it is not nearly as effective
or cost-efficient. Gas-line water remover (such as Heet or
GasDry) ought to be added to every tank of fuel that contains
ethanol.
A fuel
rail flush typically costs around $130 at a dealer.
Electrical - A bad
alternator, battery, battery cables or terminals will fail to
properly charge the battery and can cause idle
fluctuations. Optima is the preferred brand of battery for the
Q45. A temporary fix is to charge the battery using a separate
charger, or have a place like Autozone
do it for you.
MAF Sensor
- Steps on how to clean it for $3. A failed MAF (mass air
flow) sensor or MAF connector can cause
fluctuating idle, stalling, and bucking at any speed. The MAF
connector changed in 1995. A MAF or connector can be purchased
from Scottsdale
Infiniti. A used MAF may work as well.
Throttle
Body - Steps on how to partially clean it for $3.
Auxilary
Air Control - How to clean the AAC for improved idle and
cruise.
Use the search
page to look up the following at NICO. Be sure to limit your
search to either Infiniti General or Infiniti Online Mechanic:
- Knock Sensors or KS
- Bad Gas
- Seafoam
- Oxygen Sensors or O2
Sensors
- Crank Angle Sensor or CAS
- Throttle Position Sensor
or TPS
You can save money and buy
spark plugs and knock sensors directly
from Q45.org.
