Accel/dfi – Mallory Ignition ACCEL CHEVROLET APPLICATIONS (including LT-1) 74022 User Manual

Page 10

ACCEL/DFI

Turn the ignition key to the run position. Do not crank yet.
The fuel pump should run for two seconds, then shut off.
Now turn the ignition key off. Repeat this procedure of
turning the key on and off four (4) times. Again, listening
carefully for the fuel pump. This is needed to prime the fuel
delivery system. The best way to check is to connect a fuel
pressure gauge to the shroeder valve on the passenger side
fuel rail. ACCEL/DFI offers gauges for certain applications,
check your application with one of our dealers. Now check
for fuel leaks along the entire vehicle length. Crank the
engine. After the engine starts the engine should fast idle and
the speed will decrease as the coolant temperature heats up.
If the engine does not start after ten seconds of cranking,
listen or feel for the injectors opening and closing, insure the
following:

All electrical and mechanical connections are made
securely.

)

There are no fuel leaks. The cold start valve block off kit
was properly installed and tightened (if this applies to
your application).

The fuel feed line is pressurized with fuel. The most
common problem is the fuel pump is wired backward.
On the ACCEL pumps, the (+) and (-) designations are
casted in the pump adjacent to the terminals. If the
ACCEL 74702 pump is wired backward, it will run
backward.

Insure that the engine timing is properly set. After the
vehicle starts, check for fuel leaks along the entire
length of the vehicle.

User Interface Module (UIM, part number 74500)

This option allows the driver to change the three
dimensional fuel table while the engine is running. The UIM
contains two potentiometers for increasing or decreasing the
amount of fuel supplied to the engine during idle and WOT.
The idle potentiometer provides the user with the ability to
increase or decrease the amount of fuel at idle and part
throttle fuel by 10%. The WOT potentiometer comes into
play only when the throttle is fully opened. The percent
increase and decrease is 25%. The UIM does not change the
amount of fuel delivered during cranking.

The UIM must remain connected to the main wiring harness
after adjustments are made to the ECM. If it is disconnected,
the ECM will automatically default back to its preset values.

If your engine requires a somewhat different calibration than
is noted on the ECM, or you are calibrating a unique engine
combination, use the ACCEL/DFI Serial Communications
Interface option, CALMAP (Part Number 74990-S with 5ft
cable, 74990-L with 25ft cable). This software will allow you
to customize the Fuel and Timing curves as well as all other
parameters in the ECM.

F-BODY HEI DISTRIBUTOR KIT
(PART NUMBER 74170)

This kit will allow you to use a F-body HEI to control timing
with an ACCEL/DFI system. The kit consists of a jumper
harness that goes between the MWH and the distributor as
well as one that goes between the distributor and your coil.
In addition to these there is also a connector that will go
between your coil and a power source.

XII – OPTIONAL ITEMS

XI – STARTING THE VEHICLE