Chart 18

Exhaust System Concerns:

NOTE: Black smoke indicates a rich fuel mixture, blue smoke indicates burning oil, and white smoke indicates water in the combustion chamber.

SYSTEM/COMPONENT	REFERENCE ( PINPOINT TEST - CNG, FLEX-FUEL & GASOLINE ) unless noted
Base Engine	Engine System - Refer to the appropriate ENGINE article.
Black Smoke: Fuel Delivery System	Natural Gas Applications: GO to B: Natural Gas Fuel Delivery System STEP HB1. All Others: GO to C: Fuel Delivery System STEP HC1.
Black Smoke: Ignition System	For vehicles equipped with a coil pack ignition system, GO to PINPOINT TEST JC . For all others, GO to PINPOINT TEST JB .
Blue Smoke: PCV System	REFER to the appropriate ENGINE SYSTEMS - GENERAL INFORMATION article.