Resolving Rough Idle
By Jesda Gulati
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
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.
– 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
Knock Sensors or KS
Oxygen Sensors or O2 Sensors
Crank Angle Sensor or CAS
Throttle Position Sensor