Underhood Automotive
Carbon Deposits and Direct Injection Engines

The primary cause of these problems is that fuel and added detergents are not hitting the back of the intake valves.

Diagnosing Driveability Problems

Understanding what comes out through the exhaust valve is critical to solving any emissions or driveability problem.

ECM Damage

Engineers have devised two strategies that can be called the “immune system” for the electrical system.

Scan And Scope Diagnostics

Using a scan tool to communicate with different modules can confirm operation and the source of communication codes.

Oil and Carbon Deposits

Here’s how oil can influence carbon deposits.

Plastic Timing Chain Guides

Timing chain guides are designed to wear, but the guides are designed to last the engine’s life.

Understanding Audi’s Valve Lift System

The improved flow of exhaust gas to the turbocharger results in quick response and powerful torque buildup.

PC ReFlashing And Reprogramming

The choice to reflash is the hardest because there is no one solution or single path to follow.

BMW Telematics

The most common failures you will see are related to the wiring and connectors for the TCU.

Ignition Systems

The ignition coil is a very simple and robust circuit.

Repairing Wiring Harnesses

A guide to probing and poking.

Tips For Understanding Belt Friction And Tension

Serpentine belts and automatic tensioners more than tripled belt life.