This vehicle uses a purely mechanical vacuum advance system on the distributor. Manifold vacuum is ported directly to the distributor vacuum advance canister via rubber hose. Typical idle vacuum should be 16-20 inches Hg with mechanical gauge, dropping under load and rising with throttle closure.

This vehicle does not use a mass airflow sensor. Air/fuel metering is controlled mechanically through carburetor jets, metering rods, and vacuum-operated enrichment circuits. The Six Pack system relies on manifold vacuum signals to activate the outboard carburetors.

This vehicle uses a mechanical carburetor system with three Holley 2-barrel carburetors. The center carburetor operates at all times, while the outboard carburetors activate progressively via vacuum actuators above approximately 2800 RPM. No electronic fuel injection components are present.

Clean square wave showing points closed dwell period at approximately 6-9V (reduced by ballast resistor), followed by sharp drop when points open. Dwell angle should be 28-33 degrees for 8-cylinder. Consistent pattern across all cylinders with no excessive ringing or noise on the trace.

Firing line should spike sharply to 8-15kV depending on cylinder load and plug gap, followed by relatively flat burn voltage of 2-4kV for 1-2 milliseconds. After spark ends, expect 3-5 oscillations as coil energy dissipates. All eight cylinders should show similar firing voltages within 2-3kV of each other.

Catalytic converters were not mandated until 1975 model year. The 1972 440 Six Pack uses cast iron exhaust manifolds feeding into pipes with no catalysts or post-catalyst oxygen sensors.

The 1972 model year used basic emission controls (PCV, evaporative canister) but no closed-loop fuel control or oxygen sensors. Fuel mixture is adjusted mechanically via carburetor jets and mixture screws.

The 1972 440 Six Pack uses a mechanical distributor shaft driven directly by the camshaft. Camshaft position is determined mechanically through distributor rotor position, not electronically sensed.

The 1972 440 Six Pack uses a conventional distributor with either breaker points or Chrysler Electronic Ignition (if equipped). Timing is monitored via timing light on the harmonic balancer timing marks, not via sensor waveform.

The Six Pack system uses three Holley 2300 series 2-barrel carburetors with purely mechanical vacuum-operated progressive linkage. The center carburetor operates at all times, while outboard carburetors activate under heavy throttle via vacuum diaphragms.

The 1972 Challenger predates ABS technology by approximately 15 years. This vehicle uses a conventional hydraulic brake system with a single-circuit or dual-circuit master cylinder, no electronic brake control modules, and no wheel speed sensors of any kind.

The 1972 Challenger uses a purely mechanical speedometer system with a flexible cable running from the transmission (727 TorqueFlite automatic or 4-speed manual) to the instrument cluster. The cable is driven by a gear in the transmission output shaft. There is no electronic vehicle speed sensor or electronic speedometer.

The 1972 Challenger uses a mechanical variable resistance sender, not an ECM-monitored sensor. At operating temperature (195°F), the sender provides approximately 0.4-0.6V to the gauge through variable grounding. This is an analog gauge system without electronic monitoring.

The 1972 440 Six Pack engine uses three Holley 2300 two-barrel carburetors with purely mechanical and vacuum-operated systems. There is no electronic fuel injection, no ECM, and no intake air temperature monitoring. Air/fuel mixture is controlled by carburetor jetting and vacuum-operated secondaries.

1972 Dodge Challenger Waveform References

Airflow Sensors

Fuel System

Ignition System

Oxygen Sensors

Position Sensors

Speed Sensors

Temperature Sensors