Why should injectors
be ultrasonically cleaned and flow tested?
Over years of use, hundreds of warm-up and cool-down
cycles, and thousands of gallons of gasoline, injectors
can become restricted by deposits.
Deposits cause uneven flow between injectors and
incorrect injector spray patterns resulting in
insufficient atomization and incomplete combustion.
Off-car ultrasonic cleaning does what no on-car
chemical cleaner can do. Ultrasonic cleaning uses
sound waves, in a special cleaning solution, to break up
deposits – this is the same method used by jewelers,
dentists, and other professionals.
On-car chemical cleaners can do more harm than good.
Several major auto manufacturers now warn against using
chemical cleaners in their vehicles. Use of such cleaners
may void the factory warranty.
Most on-car chemical cleaners have not been tested for
compatibility with fuel tanks, lines, filters, injector
alloys, oxygen sensors, or catalytic converters. Damage
to all of these expensive components can result from
using untested products.
On-car chemical cleaners loosen dirt and contamination
from the tank, lines, fuel rail, etc., and move it into
the injector where the tiny filter screens and pintle
opening trap the contamination. Most automotive
technicians have seen a car with a minor problem
instantly transformed into a car that will barely run
because of using an on-car chemical cleaning solution.
On-car cleaning provides no way to identify injectors
with problems such as broken springs and damaged or
leaking pintles. Off-car testing allows us to cycle the
injector under an entire range of operating conditions to
Cleaning injectors will result in fewer emissions (may
help borderline cars pass inspection), better fuel
economy, and smoother engine operation.
When should injectors be cleaned and
A good time to test and clean any injector is when it
is removed from the engine. This might occur at engine
rebuild time. It is risky to re-use an injector
without testing it, since a lean injector can cause
engine damage, especially in performance applications.
- When an injector becomes restricted or is causing
an engine performance problem
- When a driveability problem is being encountered
and the injectors need to be eliminated as a
- When an injector has been in storage for a period
of time. Varnish deposits that form during
storage often cause injectors to become either
partially clogged or totally inoperative. This is
often the case with "junkyard" engines.
- When the vehicle's owner wants to achieve "like
new" engine performance