It's been almost 10 years now
that the Holley Pro-Jection has been atop the AMC 360 in my
Jeep. It's performance on and off road has been
exceptional. I have had no significant problems, a few
minor issues, but nothing is perfect. There has always
been a debate on which is better, carbs or efi. I am
not going to begin to debate that here.
Holley Pro-Jection on a 78 CJ-5 AMC 360
What it's on...
Jeep has a
rebuilt AMC 360 with an
Edelbrock Performer cam and aluminum manifold. GM HEI
distributor and stock manifolds. Great V8 combo for a
I decided on the Pro-Jection for the advantages off-road,
some carburetors are unpredictable off road and may cause
flooding and stalling. Not something you need when
trying to climb a steep hill. Fuel injection systems
are unaffected by the angle of the engine or bouncing.
Starting is quick and precise too. The Holley system I
am using is a rather simple installation with only a few
sensors, actually two that need to be installed. The
sensors are an engine temperature sensor and tach sensor.
There is a controller, throttle body, and electric fuel
The projection system uses an electronic fuel controller
with several knobs to allow fine tuning. You can
adjust fuel mixtures, choke settings, and response with ease
and while driving.
Problems I have
Actually, I have been through three. I can't blame
Holley or the injection system, I blame the fuel tank.
Steel fuel tanks in Jeeps are prone to rust and the tight
tolerances in electronic fuel pumps that are used with these
type of systems do not take well to rust particles flowing
through them. These screw type pumps do not provide
very good suction so a filter more than a fine screen is not
usable on the suction side of the pump. I needed to
eliminate the rust so I installed a polyethylene fuel tank
in place of the steel. That was 2 years ago now and I
have not had another fuel pump problem.
Throttle position sensor...With
any component failure is inevitable. This sensor
simply monitors the position of the throttle so the
controller can regulate fuel flow. When this sensor
failed there we throttle positions that caused engine
behavior to become erratic.
This system has been as reliable as anything else on the
Jeep. If it fails beyond repair I may consider an
off-road carburetor like a Holley Truck Avenger but I would
probably stick with the injection.
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