Gary Goms, Author at Brake & Front End - Page 6 of 20
Diagostic Dilemmas: Lost in ‘The Diagnostic Woods’

This real-world case study of a 2002 Chevy S-10 pickup, a 1995 Buick and a 1995 Lincoln Town Car illustrates why “chasing” trouble codes can get you lost in the Diagnostic Woods.

Tech Feature: Performing the Complete Brake Job

The problem with routines is that we tend to – you guessed it – fall into a routine. Because the braking system on many modern imports is integrated into other systems like vehicle stability control (VSC) and traction control, modern braking systems must meet minimum levels of performance. For that reason alone, short-cutting a brake repair with substandard procedures and materials is a recipe for future comebacks.

Tech Feature: Winter Starting and Charging System Maintenance

Mid-winter is usually the coldest time of the year and, although modern vehicle technology has reduced many of the cold-weather starting problems that we faced just a short decade ago, it’s still important to keep your customers’ import vehicles in top shape for winter starting.

Diagnostic Dilemmas: The Market Value for a Repair to an Older Vehicle

It’s a sign of the times that many people are bringing older vehicles into shops for repairs that they would not have considered several years ago. So it’s not unusual to see people spending more to repair a vehicle than its market value.

Crankshaft and Camshaft Position Sensor Diagnosis

Nothing is more frustrating than diagnosing an intermittent cranking, no-start complaint with no diagnostic trouble codes (DTCs) and no apparent failure pattern. Much of the time, the cranking, no-start complaint lies with a failing crankshaft or camshaft position sensor. Many of these failures can be heat-related and might require several warm-up cycles to duplicate.

Diagnostic Solutions: Air and Fuel Filter Maintenance

Although air and fuel filter maintenance is usually considered a “no-brainer” by most import repair shops, advancing technology is changing the way we should be performing air and fuel filter maintenance.

Tech Feature: MIL Diagnostics and Driveability

MIL diagnostics continues to be a “hot” topic for many import shops simply because the definition of the word continues to change. Looking at the history of modern vehicle diagnostics, most veteran technicians can remember the days when vehicles had no on-board diagnostic systems and, subsequently, required time-consuming pin-out procedures to diagnose electronic systems failures.

Priming the Preventive Maintenance — Water Pump Replacement

A water pump is a relatively simple component consisting of a drive shaft, bearing, seal, impeller and impeller housing. While the shaft, impeller and housing are considered non-expendable components, the bearing and seal are expendable.

Diagnostic Dilemmas: Harnessing in a Wiring Fault

During the summer, the speedometer on the Taurus would quit on an intermittent basis. Of course, when the speedometer would quit, the automatic transmission would default into an intermediate gear and fail to shift into the higher ranges. Although a local transmission shop installed a new VSS and performed other repairs as well, the Taurus ran only a few days before the problem resurfaced.

Tech Feature: Delivering the Fuel – Not a Fuel Pump Return

Although electronic fuel injection has become the norm since the late 1980s, some technicians still don’t understand the value of having a good diagnostic procedure for testing electric fuel pump functions. While this is not something a repair shop owner wants to hear, proper fuel component testing has become a growing industry issue, as unnecessary parts warranty returns continue to be a problem for manufacturers.

Tech Feature: Steering Gear Diagnostics

We need to understand the basics of how a power steering system works before we can develop an assessment technique. At its most basic level, the steering system’s power steering pump can generate up to 2,000 psi of hydraulic pressure. This hydraulic pressure is metered to a steering assist cylinder through a steering gear pressure control valve. Both the cylinder and valve are integral to the steering gear assembly on modern vehicles.

Tech Feature: Diagnosing Automotive Lab Scope Dilemmas

Although digital storage oscilloscopes or “lab scopes” have now become standard equipment for most modern automotive repair shops, they still possess a mystique that tends to intimidate many technicians. Right off the top, a lab scope is basically a voltmeter that displays voltage signals along a time base. The vertical scale measures the amplitude or amount of the voltage and the horizontal scale measures an incremental time line along which the signals are displayed.