Spark Plug Fouling Tests; Voltage Sensitivity; 8.4.10 Manifold Pressure Sensitivity; 8.4.11 Standard Durability Tests - Delphi Multec 3.5 Applications Manual

Multec 3.5 Fuel Injector Application Manual
8.4.8

Spark Plug Fouling Tests

8.4.9

Voltage Sensitivity

8.4.10 Manifold Pressure Sensitivity

8.4.11 Standard Durability Tests

8.4.12 Icing Tests

8.4.13 Production Limit Verification Tests

Delphi Energy and Chassis Systems
2.2.6.4) Driveability index is a measure of the distillation curve, and is
somewhat independent of the RVP of the fuel. High DI fuel typically
results in sags and stalls during warm up as a result of leaner operation
due to less evaporation of the fuel. Normal cold start procedures would be
used for evaluation.
Spark plug fouling tests are conducted to verify the calibration's
robustness to short start and run cycles at low ambient temperatures.
These are conditions that might be experienced on a new car dealer lot, or
by someone driving short distances in the winter. In either case, the
vehicle is not allowed to fully warm up and stabilize between soaks and
starts. Testing consists of soaks, starts, and short drives at a low ambient
temperature, typically -20
This testing would verify on the vehicle the voltage correction tables
previously developed on the flow stand. This should be done with
characterized injectors. System voltage would be varied, and long and
short-term correction factors monitored.
This testing would verify on the vehicle the vacuum (or MAP) corrections
developed on the flow stand.
These are vehicle manufacturer specific, but would typically include tests
such as: rapid mileage accumulation, salt spray, water intrusion, rough
roads, high speed, taxi fleets, etc.
The purpose of the icing tests would be to verify the resistance of the
injector and injector placement to water or ice accumulation. This test
would be conducted at low ambient conditions. After each test sequence,
it is necessary to remove the injectors and verify the presence of ice, or
use a Bore-scope to visually check for ice. (See section 2.2.7.4)
In order to test the limits of the engine calibration and diagnostic
algorithms it is recommended to evaluate limit fuel systems. Performance
limits to be considered include pressure, flow rate, leak, and spray. The
Testing Recommendations and Precautions
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F.
Revision: 11/05-1 8-5