Mallory Ignition ACCEL Digital Fuel Injection Engine Management System 74030 - Manual (Page 25)

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ACCEL/DFI
XII. TROUBLE SHOOTING GUIDE
The following are some common problems we have
encountered with various installations.
Injectors not firing (clicking) - the vehicle will not start:
• Usually due to a low battery. Voltage must be above nine
(9) volts during cranking to activate the ECM.
• Injector harness not connected to the main wiring harness.
• Short in either pin P1-C7 or P1-C8. Check continuity to
battery positive (+) and negative (-) wires with an OHM
meter.
• Tach wires to positive (+) side of coil instead of negative (-).
• P1-D7 (long pink wire with female spade connector) not
receiving +12 volts during cranking. Usually due to
connecting this wire to a voltage source that is disabled
during cranking.
Runs rich at idle:
• Vacuum line to fuel pressure regulator not connected.
• MAP sensor vacuum line pinched.
• UIM idle knob turned all one way.
• Wrong injectors for the application.
• Return fuel line is too small/restricted.
• Calibration in the ECM is wrong for the application.
Runs rich all the time:
• Wrong injectors for the application
• Return line is too small/restricted.
• Calibration in the ECM is wrong for the application.
Engine cranks a while before starting:
• +12V and ground terminals not connected directly to battery.
• Fuel pump is not priming the fuel system.
If you are experiencing problems please contact your ACCEL
dealer, of feel free to call ACCEL’s technical service line and talk
to an ACCEL DFI technical representative at 1.216.398.8300 ext. 5.