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Diagnostic Dilemma: The Case of the Missing Code

When doing mobile diagnostic work, no-code stalling complaints are a major part of your agenda. In most cases, the client shop is simply too busy to duplicate the failure or, in some cases, a long test drive will yield nothing in the way of useful...

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Secondary Ignition: The Art of Spark

What is a coil? From the beginning of the internal combustion engine, several different ignition systems have been used to create a high-energy spark. The most popular system, and the one that’s in use today, is a step-up coil. A coil is nothing...

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Diagnosing Catalytic Converter Failure Symptoms

Although construction can vary according to engine application, the common three-way catalytic converter contains a reduction and oxidation stage. To create maximum surface area, each stage is generally a ­ceramic or stainless steel honeycomb substrate...

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Electronic Proportioning Valve: Doing More With Less Hardware

Anti-lock brake systems (ABS) and the HCU are replacing proportioning, combination and other valves to change the braking forces in the front and rear. This is called Electronic Brake Distribution (EBD) and it can dynamically change the proportioning...

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NHTSA’s GM Brake Line Corrosion Investigation: Reading Between the Brake Lines

There will be no recalls on some GM vehicles for brake line corrosion. Instead, we received an advisory from the National Highway and Traffic Safety Administration (NHTSA) about brake line inspection and car washes. What was not discussed was the corrosion...

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2007-2011 Ford Expedition and Navigator Air Suspension

The Ford Expedition air suspension does more than just lift and raise the vehicle. The system levels the vehicle under loads and when a trailer is attached. The system uses only two air bags on the rear axle unlike previous models with air bags on all...

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MAZDA: Timing Belt & Chain Replacement

This month, we’re going to be looking at the ­timing components on the Mazda line of vehicles. We’ll be focusing on timing belts since they are considered a service item and will present the greater amount of opportunity for replacement. Then, we’ll...

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Honda Element Brake Job

It may look like a car that was never removed from the box it came in, but the Honda Element isn’t boxy when it comes to the brakes. Based on the CR-V platform, there is also nothing tricky when it comes to service. But, its brake system is hardware...

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The Changing Maintenance Market: New Technologies Mean More Opportunities

Most of us wake up each morning, not ­realizing that our professional world has changed even as we slept. Our first job of the day is to service a ­vehicle equipped with an oil life monitor. Not only do we discover that modern oil life monitors can...

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Converter Codes: How Long Will the Light Stay Out?

OBDII systems with faulty catalytic converters will normally store a diagnostic trouble code (DTC) when the converter begins to fail. The OBDII converters use an upstream and downstream oxygen sensor to measure the differences in oxygen content between...

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Maintaining Your Spray Guns

If there’s one piece of equipment that epitomizes the painter and the paint shop, it’s the spray gun. Over the years we’ve seen many spray guns. Although there are operating principles and functions that remain the same, some have been improved...

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Wheel Bearing Adjustment Tools & Equipment

A recent survey showed that more than half of the bearings on the road today are adjusted incorrectly. A wheel bearing that’s out of adjustment can reduce bearing life and can affect more than just the bearing. An out-of-adjustment bearing affects...

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With the summer season comes a few things in particular that companies need to consider. Here are a few hot topics that may apply...Read More

Applies to: All OBD II models Service Tip Kia’s OBD II engine management systems use dual oxygen sensors, which among other things allow monitoring of the...Read More

If your shop is not in California, the replacement of the catalytic converter is simple and typically there is only one replacement option. Most...Read More

Catalytic converter efficiency codes can be a long diagnostic road that can either lead to a happy customer or an expensive comeback. Chances are...Read More

The perfect internal combustion vehicle would be able to put the exact amount of fuel and air into the combustion chamber. If the perfect...Read More

ASE TEST PREP

Engine Gasket

Passing the ASE A1 can be difficult. Do not go into this test with the notion that this is an exam for engine rebuilders. Many of...Read More

VIDEO TRAINING

video

MAHLE Aftermarket’s Bill McKnight explains the surprising involved and complicated world of fuel  filters in today’s pass cars and light trucks. You’ll be amazed...Read More

Product Showcase

Electronic Specialties introduces a new product, #635 CATIII Automotive Test Lead Set. This kit includes a basic assortment of accessory test leads, which are in...Read More

Headlines

The digital version of the May issue of Underhood Service is available on-line. CLICK HERE to access the easy-to-view digital version that features articles on...Read More

Mitchell 1 has enhanced its SocialCRM shop marketing service by adding a new feature that gives automotive repair shops the ability to recover “lost...Read More

TI Automotive has announced the availability of 150 new part numbers to its high-performance fuel systems catalog. Many of the new part numbers are designed...Read More

NACE | CARS has announced details for the destination tours in Detroit for 2015. These tours have been organized to provide attendees with the...Read More

MOTOSHOP Technology Tools, a product portfolio from Advance Auto Parts, has launched a contest for commercial garages and repair shops that will award one...Read More

In celebration of 100 years in business, General Tire has launched the General Tire 100th Anniversary Sweepstakes, which will award six winners a set...Read More

CORSA Performance has engineered new cat-back exhaust systems acoustically tuned specifically for the 2015 Ford F-150. For a more aggressive sound, the company offers...Read More

Carl Edwards raced his Bosch-equipped No. 19 Subway Toyota to victory in Sunday’s Coca-Cola 600 NASCAR Sprint Cup Series  Race at Charlotte Motor Speedway....Read More

Akebono Brake Corporation has recently become a Silver Partner sponsor of Kettering University’s Formula SAE (Society of Automotive Engineers) team for the 2015/2016 season....Read More

Beta Tools of Italy offers #80 double-end, swivel socket head wrenches, which are made to swivel 180° on a single-plane axis to allow access...Read More
Latest articles from our other sites:

Ultimate Underhood: From Mechanical Fuel Injection to Putters

Mechanical constant stream fuel injection is the pinnacle of pure mechanical engineering. The mechanic setting up the system must optimize the amount of fuel for a given throttle position, rpm and engine...More

Induction Cleaning Service For Direct-Injection Vehicles

You may have seen it before: misfire codes, stumbling and suspicious fuel trim numbers. On a scan tool, the engine may show a loss in volumetric efficiency. The driver may complain about a loss of power,...More

Electronic Proportioning Valve: Doing More With Less Hardware

Anti-lock brake systems (ABS) and the HCU are replacing proportioning, combination and other valves to change the braking forces in the front and rear. This is called Electronic Brake Distribution (EBD)...More

NHTSA’s GM Brake Line Corrosion Investigation: Reading Between the Brake Lines

There will be no recalls on some GM vehicles for brake line corrosion. Instead, we received an advisory from the National Highway and Traffic Safety Administration (NHTSA) about brake line inspection and...More

Tips For Spark Plug Removal

Removal or installation of spark plugs on modern vehicles requires extreme precision and care. Before removing a spark plug, check to see if it’s still working properly and whether the engine itself...More

Oil Service for Today’s Vehicles

You have most likely been made aware over the last few years that you need to be diligent in which oil you choose when servicing today’s modern vehicles. Hopefully your team is trained to look up the...More

Beta Tools Offers Double Swivel End Socket Wrenches

Beta Tools of Italy offers #80 double-end, swivel socket head wrenches, which are made to swivel 180° on a single-plane axis to allow access to confined spaces. They are bright polished chrome vanadium...More

Electronic Specialties Introduces Its Automotive Test Lead Set

Electronic Specialties introduces a new product, #635 CATIII Automotive Test Lead Set. This kit includes a basic assortment of accessory test leads, which are in compliance with IEC Safety Rating of...More