Electrical comparison
The factory injector-coil procedure compares injector voltage behavior after the initial current surge and warns that winding temperature changes the reading.
LT1 · 1994 · INJECTORS
1994 LT1 Injector Electrical & Balance Test
Electrical condition and fuel delivery are two different injector tests. Passing one does not prove the other.
APPLICATION: 1994 Firebird / Formula / Trans Am 5.7L LT1 using the applicable factory C-2A injector procedure.
Mechanical/flow comparison
The pressure-drop portion compares each injector against the average. The factory procedure uses a 10-minute cool-down to avoid hot-soak fuel boiling corrupting the result.
DO NOT CALL A FLOW PROBLEM ELECTRICAL
An injector can have an acceptable electrical winding yet be restricted, leaking or mechanically inconsistent. Conversely, equal pressure drop does not prove the driver circuit is healthy.
Factory comparison points
- Ignore the first second of the electrical reading because initial current surge can distort it.
- Erratic electrical readings can indicate an intermittent internal connection.
- The pressure-drop test should be performed after the specified cool-down period.
- The factory flow comparison accepts individual pressure drop within 1.5 psi of the average for this procedure.
FPV RULE
OBSERVE → MEASURE → ISOLATE → PROVE → REPAIR → VERIFY. Do not turn a symptom, DTC or catalog fitment label into a parts order.