Master Cylinder Inspection
Although the mechanics of modern master cylinders seem deceptively simple, today’s dual-piston or tandem master cylinders still require the utmost in care and attention to maintain safe, reliable operation. The tandem master cylinder contains two piston assemblies; one for each axle set or diagonally located pair of brakes. Each piston assembly has two lip seals
Ignition Misfires
A flashing Check Engine light and a P0301 to P0312 diagnostic trouble code is a sure-fire indication that one or more cylinders are misfiring. Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. The engine usually feels rough, lacks power and uses more gas than usual. Sometimes a misfire may feel
Top Five Tools
Ron Promisson, owner Promisson Automotive Service Center Bushnell, IL Power Probe II — This is an indispensable tool for all kinds of diagnostic problems. Probably the one tool I couldn’t do without. Raytek AutoPro ST25 Infrared Thermometer — This is another favorite that can be used for many different applications. Snap-on Vantage — The diagnostic
Nissan: Driveability Issues
Earning Loyal Customers Through Accurate and Efficient Diagnostics This article will take a look at some of the common problems that cause check engine lights to illuminate and/or driveability problems on the popular Nissan line of vehicles. With many states adopting statewide OBD II emission inspections, the days of ignoring the light are over. We’ll
Diagnostic Dilemmas: Internal Engine Diagnostics
The nuts and bolts of measuring cylinder leakage In OBD II diagnostics, most of us know that an external component like a faulty fuel injector, ignition coil, spark plug or spark plug wire is usually responsible for a P0300-series cylinder misfire trouble code. Nevertheless, even with more sophisticated onboard diagnostic strategies, the PCM usually can’t
A/C Update: Bad A/C Blowers & Fuses
One component air conditioners and heaters share in common is the blower motor. The blower motor is usually located in the Heating, Ventilation and Air Conditioning (HVAC) housing under the dash. The blower motor spins a squirrel cage fan that delivers both cold and hot air. If the driver wants cold air and turns on
Tech Tip: Updated Routing of Volvo O2 Sensor Wiring
New routing has been developed for oxygen sensor wiring on 1997-’98 Volvo 850 models, S70/V70/C70, to prevent contamination from reaching the probe’s reference air. If one oxygen sensor is replaced, the new adapter wiring must be installed for both sensors.
Diagnostic Solutions: Upgrades That Deliver Performance and Pizzazz
Checking the Basics Saves Time When Chasing Check Engine Codes
Tech Tip: Going Digital – DMMs and DVOMs
These days, no matter what kind of automotive repair work you specialize in, virtually every system has a certain amount of electronics. Consequently, one diagnostic tool every technician needs is a digital multimeter.
Tech Tip: Spotting Problems with a Non-Contact Infrared Thermometer
Being able to measure temperature variances can play an important roll in diagnosing vehicle maladies for both undercar and underhood technicians. This can be easily accomplished by using a non-contact infrared thermometer. With this tool, technicians simply point the thermometer at the area of concern and they are immediately provided with the temperature of the surface in question.