Engine Archives - UnderhoodService

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Honda Electronic Throttle Body Service Tips

Using care and following OEM procedures will help you to avoid unnecessary parts replacement and comebacks.

New Oil Specifications

Many 0W16 oils have a new donut certification mark on the bottle called API SN-PLUS and SN-PLUS Resource Conserving.

Solving Intermittent Overheating

New cooling systems anticipate and influence changes in coolant temperature.

Ignition Systems

The ignition coil is a very simple and robust circuit.

Alternator Testing For No Charge Conditions

Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness.

Lifter Deactivation

The area of contact between the lifters and cam lobes is the highest loaded surface inside an engine.

Battery Charging and Diagnostics

Here are six tips to use when diagnosing a vehicle with a dead battery. 

Diagnosing Crankshaft Position Sensors

Modern engines need to not only know the position of the crankshaft, but the position of the camshafts.

Electronic Throttle Body Service

On most systems, idle speed is completely controlled by the throttle plate angle.

Diagnosing Misfires

What if there are no codes and a misfire is intermittent? This is where it gets complicated.

Spark Plug Evolution

Spark plugs have changed over the years.

How Speed, Load and Slip Affect Voltages

Modern, computer-controlled charging systems found on today’s vehicles need proper test procedures – no guesswork allowed.