nctcog logo
 
transportation label

 

 

Common Causes for Smoking Vehicles or Visible Exhaust

Go to the RSVP home page

English Chart [PDF]

Spanish Chart [PDF]

Engine Type

Visible Sign

Diagnosis

Possible Causes

Gasoline

Black or Gray Smoke

Smoke may be coming from incomplete fuel combustion

 

  • Clogged air filter
  • Carburetor, choke, fuel injection or emission system malfunction
  • Ignition timing off
  • Blocked manifold
  • Oil leaking on exhaust system

 

Blue Smoke

Engine oil being burned

 

  • Oil leaking into combustion chamber
  • Worn piston rings, valves or cylinders

 

White Smoke

Coolant and/or water being vaporized in combustion chamber

 

  • Engine too cold (no repair needed)
  • Head gasket leaking
  • Cracked block or cylinder head

Diesel

Black or Gray Smoke

Smoke may be coming from incomplete fuel combustion

 

  • Faulty injection system
  • Clogged air filter
  • Wrong grade of fuel
  • Timing may need to be adjusted
  • Engine overheating
  • Oil Leaking on exhaust system

 

Blue Smoke

Engine oil being burned or atomized

 

  • Engine oil level too high
  • Worn piston rings, valves or cylinders

 

White Smoke

Fuel is not burning

 

  • Engine too cold (no repair needed)
  • Faulty injection system
  • Incorrect timing
  • Engine overheating

2/5/2014  05/19/2009  CG

 CONTACT US | SITE MAP | LEGAL | SYSTEM REQUIREMENTS
Find Us on Facebook  Follow Us on Twitter  Tubin with the COG Trans  Grammin with CogTrans
 North Central Texas Council of Governments | P.O. Box 5888 Arlington, TX 76005-5888
 Main Operator: (817) 640-3300 | Fax: (817) 608-2315