Featured Archives - Page 7 of 15 - UnderhoodService
The BMW M12: One Horsepower Per One CC

In 1986, the turbocharged BMW M12 engine for F1 could produce an amazing 1,500hp for qualifying trim. Not bad for a 1,500cc engine. Even more amazing was that they used stock blocks from their road cars to manufacture the engines.

Unconventional Auto Repairs

There are times when all the diagnostic trees, diagrams and graphs in the world aren’t enough to properly repair a vehicle. Sometimes, you just can’t get from Point A to Point B without some homemade ingenuity.

Are We The Underdogs of The American Economy, or Are We The Foundation?

The auto care industry is an economic underdog. But if you look a little closer, it’s been a cornerstone of growth through the good times and the bad.

Fencing In Vehicle Networks: Discussing Cybersecurity Best Practices On The Horizon

Shortly, you will see cars in your bays that have the ability to communicate with one another. These cars are already on the street, and can facilitate driver access to potentially dangerous networks.

Hyundai Fuel System And Emissions Diagnostics

Bob Dowie recently had a 2002 Elantra GLS in the shop. This vehicle is a good example of some common fuel trim and emissions problems you’ll see.

Spark Plug Replacement Basics: Removal, Installation And Choosing The Right Plug

Spark plug replacement is considered one of the least complicated tasks at a shop, but ignorance of what you are dealing with can get you into trouble.

Engineered Accessory Drive Serpentine Belt Replacement

You might not be able to see it, but an accessory drive belt is always both speeding up and slowing down. When a piston accelerates downward after the ignition of the fuel and air, the crankshaft speeds up and then slows down as it reaches the bottom of the stroke. These changes in speed are minimal, but big enough to cause problems.

Preventive Maintenance Profits: Preferred Automotive, Jenkintown, PA

With the summer months heating up and cross-country road trips beginning, many people want to make sure their vehicles are prepped for the long haul. For the first-ever July edition of Maintenance Chronicles, we will focus on Preferred Automotive Specialists, a six-bay shop located in Jenkintown, PA. This shop boasts exceptionally high numbers in all

Toyota Tech Tip: Rough Idle And Stalling

Some 2007 model year Avalon, Camry, Camry HV, and Solara vehicles may intermittently stall at idle or set one or more of about six DTC codes.

Jeep Tech Tip: 4WD Light On, DTC C140F Set

Customers may indicate that the “Service 4WD” indicator in the instrument cluster is illuminated. They may also indicate that the transfer case will not shift from 4WD High, 4WD Low, and/or Neutral once the lamp is illuminated. Further investigation identifies that a Diagnostic Trouble Code C140F is stored or active in the Final Drive Control Modules (FDCM) memory.

GM HVAC Door Actuator Motors: Operation And Calibration

There are several types of electrically driven actuator motors used in today’s GM cars, and they all function differently. Keep reading for operation tips.

GM: Transmission Not Moving Or Excessive Slipping

When a GM 6L80/90 transmission finds its way into your shop with a complaint of no forward or reverse movement, or is slipping badly in all ranges, initial inspection may reveal a cracked or split sump filter. However, filter quality may not be the underlying issue.

Drivetrain Diagnostics Transmission