1. Home
  2. Autos
  3. Auto Repair

Troubleshooting Through the Exhaust Pipe
Blue, White, Gray or Black Smoke in Exhaust

By , About.com Guide

Just like you can examine an animal's poo to get an idea of its health, you can pay attention to the quality of your car's exhaust to get an idea of what's going on inside the engine. As the engine burns fuel and creates exhaust, lots of different things are happening. Unfortunately some of these things aren't supposed to happen. Things like burning oil, evaporating coolant and leaving unburned fuel in the exhaust -- these are not good to see. Pay attention to what's coming out and you can get a good idea as to what problems your engine may be having, often before they get bad. This saves you money.

We've listed the most common symptoms and their causes to help you troubleshoot your exhaust by color and by smell. Follow the links to read up on what's happening in your engine.

Blue or Gray Smoke

White Smoke or Water Vapor

Black Smoke

Fuel Odor or Drop in MPG

Explore Auto Repair
About.com Special Features

How to Inspect a Used Car

Stay safe and save time by following these tips before driving a used car. More >

New and Redesigned Cars for 2010

Discover the hottest cars for the 2010 calendar year. More >

  1. Home
  2. Autos
  3. Auto Repair
  4. Troubleshooting
  5. Exhaust Troubleshooting - Exhaust Smoke Color - Exhaust Pipe Diagnosis - Black, White, Blue Exhaust Smoke>

©2009 About.com, a part of The New York Times Company.

All rights reserved.