Smoke Diagnosis Charts

SMOKE DIAGNOSIS CHARTS

The following charts include possible causes and corrections for excess or abnormal exhaust smoke. Small amounts of white smoke or water vapor (at certain times) are to be considered normal for a diesel powered engine.

NOTE: Visible black smoke at the tail pipe is an indication of an after treatment (diesel particulate filter) failure. Follow inspection/replacement guidelines in the exhaust section to correct after treatment failure. The diesel particulate filter MAY have failed due to the possible causes listed below.











NOTE: Visible blue smoke at the tail pipe is an indication of an after treatment (diesel particulate filter) failure. Follow inspection/replacement guidelines in the exhaust section to correct after treatment failure. The diesel particulate filter MAY have failed due to the possible causes listed below.