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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 31 (Engine Controls - Tests W/Codes - 3.3L CNG) >> Self-Diagnostic Tests >> Test NTC-4A - Checking Fuel Injectors

Test NTC-4A - Checking Fuel Injectors

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
  1. Start engine. Allow it to reach normal operating temperature (more than 180°F). Individually, disconnect each injector connector while observing engine for a drop in RPM as injector is disconnected.
  2. If engine speed drops more than 50 RPM on all cylinders, test passed. Perform TEST VER-2. If engine speed does not drop more than 50 RPM on any cylinder, perform appropriate test. See INJECTOR DIAGNOSTIC TEST table below.
INJECTOR DIAGNOSTIC TEST

Injector No. Test No.
1 NTC-4B 
2 NTC-4C 
3 NTC-4D 
4 NTC-4E 
5 NTC-4F 
6 NTC-4G