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Thread: Lack of spark - help.

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    Default Lack of spark - help.

    I could use some help with my ignition setup. I tried to measure cranking timing with a timing gun and get nothing. Some advice on next steps is appreciated. Engine is a 2003 4.7L Jeep stroker. It has 'dumb' coil rail and waste spark ignition. I'm using a Holley 554-112 four channel driver module. Ignition output setup is "DIS Waste Fire (Active Low)". Since I have a coil rail, I have no spark plug wires to clip the pickup from my timing gun. I made some short adapter cables out of a cheap set of spark plug wires. The adapter plugs into the coil rail like a spark plug. The spark plug then plugs into the wire. I verified that this setup actually made good contact before installing on the engine.

    This is a fresh engine build and has never been fired. I pulled the push rods to remove pressure on the camshaft lobes. I pulled the spark plugs so no compression would build up. For my timing test, I had the spark plugs resting in their holes at any angle. The spark plug was grounded to the head.
    I verified that the coil driver module had power.
    Oil pressure is ~20 psi during all of this.
    Cranking RPM is ~150. I do not know why it is so low. Battery is new and fully charged. Starter cable is 2 AWG and new.
    I have cranking RPM set at 100 RPM in the ECU.
    Wiring diagram is attached.
    PlugB.pdf
    Last edited by Jeep4.7; 07-15-2019 at 11:32 PM.

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