November 2018 Archives - UnderhoodService
GM Tech Tip: Black Smoke And Rough Idle On Cold Start

The driver will complain that during a cold start black smoke will come from the exhaust and the engine will have a rough idle and minimal misfires. With the introduction of direct fuel injection systems, GM has revised the cold start control system to reduce cold start emissions. Quicker catalytic converter heating helps meet the ever-changing emission requirements and improve fuel economy.

Hyundai Tech Tip: Engine Vibration Due To Misaligned Timing Marks On The Oil Pump

This bulletin provides information regarding the proper indexing of the timing marks of the Oil Pump Module during in-vehicle installation on vehicles equipped with Theta four-cylinder engines. If the Oil Pump Module timing marks are improperly indexed, abnormal engine vibration may result. Follow the service information outlined in this bulletin whenever a new or existing Oil Pump/Balance Shaft Module (BSM) is being installed.

Diagnosing Turbo Boost And Leak Problems

You are probably seeing more turbocharged four-cylinder engines at your shop. Domestic manufacturers like GM and Ford have powered a wide variety of cars and SUVs with small displacement turbo engines. Also, import manufacturers like BMW, Nissan and VW use turbos on base engines and high-performance engines.

Diagnosing Throttle-By-Wire Problems

The main reason for the switch to Throttle-By-Wire (TBW) or Drive-by-Wire is that it allows the ECM to work in harmony with other engine control systems such as cruise control, traction control, torque management and stability control.

Top EVAP Tips When Replacing Fuel Pumps

Nothing is worse that an EVAP code after a fuel pump has been replaced. Discovering that the tank needs to be dropped again to address a problem can kill shop productivity and profitability. Keep reading for tips that can help you avoid comebacks and dropping the tank for a second time.

Ford TPMS Service

Ford embraced tire pressure monitoring systems (TPMS) as early as the 2002 model year on the Explorer and Windstar. These systems can be either direct or indirect. From 2006-’09, Ford used banded sensors mounted in the center of the rim. In 2010, Ford reverted to valve stem-mounted sensors. All the systems are straightforward and common service procedures apply to most models.

Alternator Testing Tips

If only battery voltage is present at the battery on a running engine, does this mean the alternator is “bad?” No, it does not. It only means that the alternator is not charging, but does not reveal why. Therefore, it does not prove a faulty alternator.

The American Image Problem

I am going to say it, American technicians have a bad image. But, the image is not the reality. Most technicians are electricians, fabricators, engineers, IT troubleshooters and entrepreneurs all rolled into one. But, we are still fighting the image problem with consumers who think anyone can fix a car, or they are too smart to get their hands dirty.

Dodge Tech Tip: Drone Or Vibration Present During MDS Operation

This bulletin involves selectively erasing and reprogramming the Powertrain Control Module (PCM) with new software for the 2010-2013 1500 Ram with the 5.7L engine and automatic transmission built on or before July 17, 2014.

Ford Tech Tip: Gas Nozzle Stuck In Filler Neck

Some vehicles equipped with the Easy Fuel Capless Fuel System may exhibit a concern where a fuel nozzle cannot be inserted and/or removed. This concern may be caused by a problem with the fuel station nozzle. The sleeve at the tip of the spout may be missing, not allowing the nozzle to be inserted, or could be loose/gapped not allowing the nozzle to be removed once inserted.

Conventional vs. Synthetic Oils: What’s In The Bottle?

According to the American Petroleum Institute (API), base oils can be broken down into five main groups based on the refining method and lubricant’s properties, such as viscosity and the proportion of saturates and sulfur content. Before all the additives are dropped in, engine oils begin as one or more of these five API groups.