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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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Ford: ABS Light On With DTCs C1175, C1236, P0500 or P0503

Model: 2005-’07 Super Duty Some 2005-‘07 Ford Super Duty vehicles may exhibit an ABS light on and possible diagnostic trouble codes (DTCs) C1175, C1236, P0500 and/or P0503. This condition may be due to faulty vehicle wiring, a failed wheel speed...

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Composite Rotors Are Back

Veteran technicians will remember the problems with composite rotors in the late 1990s. These rotors had hats of stamped steel cast into the iron rotor. They saved weight, but they were prone to runout and installation errors. These types of rotors...

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Power Steering Dynamics and Diagnostics

Twenty-five years ago, when the power steering failed, diagnosing the system was easy. The most difficult problem to diagnose was the “morning sickness” that plagued some ­vehicles when they were cold. Today, the introduction of speed sensitive steering,...

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Saab: Fuel Sending Unit Replacement

The 2006 Saab 9-3 Sport sedan came in on the hook and the tow truck driver said, “I think it needs a fuel pump.” The gas gauge was reading less than a quarter of a tank and the low fuel warning light wasn’t on, so a quick fuel pressure check was...

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KIA: Brake Light On, Tachometer And Speedometer Inoperative

Applicable Models: 2001 Kia Optima LX, 2.4L Complaint The customer states the red brake light is illuminated on the instrument cluster. The ­customer also states the tachometer and speedometer intermittently stop working. Cause Confirmed the customer’s...

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Mazda: Fuel System Servicing Precaution

Applicable Models: 2004-’07 Mazda3 2005-’07 Mazda6 2006-’07 MX-5 vehicles During service/removal of fuel system parts on the above vehicles, the memory of the malfunctions and the long-term fuel trim need to be cleared by either removing the...

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Pulling Codes: Multiple Misfire Personalities

A Story of Codes P0302, 04, 06, 08 & 03   This month’s diagnostic journey begins with a 2008 Land Rover Discovery that is taken in to a local testing facility for an emission test and fails due to a series of misfire codes. Misfire...

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Using Volumetric Efficiency to Determine the Health of an Engine

Measuring voumetric efficiency can diagnose problems like blocked catalytic converters, bad MAF sensors or vacuum leaks. Glen Beanard show you how to do it with a scan tool. For the complete article, click here.  ...

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Phoenix Systems Sends Facebook Giveaway Winner to Meet Larry McReynolds for All-Star Race

Phoenix Systems, maker BrakeShot, BrakeStrip and Reverse Brake & Clutch Bleeders, announced the winner of its 2015 Win Race Tickets Facebook Giveaway. Suzanne Cleary Drews from Edgewater, FL, is this year's grand-prize winner. Phoenix Systems will...

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This month, CARDONE Industries has released 29 A1 CARDONE reman numbers and 12 CARDONE Select new part numbers. Highlights of this month’s new part...Read More

The 2006 Saab 9-3 Sport sedan came in on the hook and the tow truck driver said, “I think it needs a fuel pump.”...Read More
selling air filters

Air filters are normal wear items that ­require regular checks and ­replacement. Their role is to trap dirt particles that can cause damage to engine...Read More

Model: 2005-’07 Super Duty Some 2005-'07 Ford Super Duty vehicles may exhibit an ABS light on and possible diagnostic trouble codes (DTCs) C1175, C1236, P0500...Read More

While raising the awareness of preventive maintenance sounds good in theory, especially during April Car Care Month, the reality is many ­motorists’ ­vehicle maintenance...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

General Technician Equipment (GTE) has introduced MasterPry LED, a tool for professional technicians. With the MasterPry LED, technicians can gain maximum efficiency yet maintain the...Read More

Headlines

Ricky Stenhouse Jr. and the MOOG Steering and Suspension-equipped No. 17 Zest Ford earned their first top-five finish of the season and crew chief...Read More

Attendee registration is now open for AAPEX 2015. AAPEX is slated for Nov. 3-5 at the Sands Expo in Las Vegas, with AAPEXedu sessions...Read More

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

How many auto repair pet peeves are out there? Well, enough of them that one article wouldn’t hold them all. I’ve received so many...Read More

Corded lights preventing you from working where and when you want? Then get a convenient cordless light … new from JEGS. Available in three...Read More

With vast coverage for both domestic and import applications and hardware included to make installation fast and easy, exhaust manifolds from Graywerks by ATP...Read More

WORLDPAC has announced the opening of a new regional distribution center in Santa Cruz, California. The facility offers expanded delivery and service options to local independent...Read More

Federal-Mogul Motorparts’ “Garage Gurus” will award $30,000 in scholarships to qualified full-time and part-time students who are studying to become professional automotive technicians. The...Read More

Dorman Products has announced the launch of its new stainless steel brake hydraulic lines. Along with this new product launch comes a free training...Read More

The Aftermarket Auto Parts Alliance has launched the Canadian Castaway Sweepstakes. During the event, the Alliance is giving away two $25,000 NITRO Bass Boat/Motor/Trailer...Read More
Latest articles from our other sites:

Ultimate Underhood: Chrysler Slant Six

While the Chrysler Slant Six did not have the raw power of the Hemi, it was just a sophisticated. The Slant Six went into production in 1960 and lasted until 1983. The 30º tilt was borrowed from Mercedes-Benz...More

Lithium: An Element That Is Charging Ahead

What is an EMV? As you read the hybrid and plug-in articles that my company, ACDC, is writing this year, we have coined a new term: EMV (electric motor vehicle). Rather than use hybrid, plug-in hybrid,...More

Nivomat shocks can be found on a variety of vehicles. They are self-leveling shocks that use an internal pump on the piston to control the level of the vehicle. There are no external lines or connections. Five...More

PHOTO TECH: How a Brake Pad is Made

Even with zero moving parts, the common replacement brake pad is one of the most difficult to engineer and manufacture components on a vehicle. From the initial design to the final packaging, we...More

Saab: Fuel Sending Unit Replacement

The 2006 Saab 9-3 Sport sedan came in on the hook and the tow truck driver said, “I think it needs a fuel pump.” The gas gauge was reading less than a quarter of a tank and the low fuel warning light...More

Lithium: An Element That Is Charging Ahead

What is an EMV? As you read the hybrid and plug-in articles that my company, ACDC, is writing this year, we have coined a new term: EMV (electric motor vehicle). Rather than use hybrid, plug-in hybrid,...More

JEGS Offers Cordless LED Work Lights

Corded lights preventing you from working where and when you want? Then get a convenient cordless light … new from JEGS. Available in three types, all JEGS Cordless Work Lights feature bright LED bulbs,...More

Pulling Codes: Multiple Misfire Personalities

A Story of Codes P0302, 04, 06, 08 & 03   This month’s diagnostic journey begins with a 2008 Land Rover Discovery that is taken in to a local testing facility for an emission test and...More