Simple Fixes For Bad Battery Connections
Protect Your Fuel Tank and Pump With Delphi Technologies
Misfire Codes After A Spark Plug Replacement (Video)
FRAM® Provides Next-Level Engine Protection for the Summer
Auto Value, Bumper to Bumper Tech OTY Finalists Named
Simple Fixes For Bad Battery Connections
Protect Your Fuel Tank and Pump With Delphi Technologies
Misfire Codes After A Spark Plug Replacement (Video)
FRAM® Provides Next-Level Engine Protection for the Summer
Auto Value, Bumper to Bumper Tech OTY Finalists Named
Sponsored By Carter Fuel Systems
Sponsored By NGK Spark Plugs
Smooth Roads Ahead: Making Wheel Bearing Jobs Work for Your Shop
Sponsored By BCA Bearings by NTN
Wheel bearings are safety-critical components which feature precision engineering, robust construction, and a long service life. However, all wheel bearings will eventually need to be replaced. Wheel bearing or hub assembly replacement can present a number of challenges to technicians. This could be due in part to bearing design, construction, corrosion buildup, and/or replacement parts selection.
During this 45-minute webinar we will discuss:
Speakers Matt Gorski, Manager of Product Development, NTN Bearing Corporation of America Divjot Singh, Applications Engineer, NTN Bearing Corporation of America Brian Sexton, Automotive Technical Writer, Babcox Media
Sponsored By BCA Bearings by NTN
Sponsored By Carter Fuel Systems
ShopOwner includes technical and management content and is free to download and read.
The knock sensor is not the only sensor responsible for detecting engine knock.
Throttle-by-wire systems proactively manage the air and fuel going into the combustion chamber.
Underhood Service targets repair shops that derive 50 percent or more of their revenue from the service and repair of under-the-hood systems. The expanding amount of knowledge and capital needed to keep up with technological advances has led these shop owners to concentrate on underhood systems, while also offering preventive maintenance services on most major vehicle systems. By subscribing, you’ll receive the ShopOwner digital edition magazine (12 times/year) featuring articles from Underhood Service and the Underhood Service eNewsletter (twice weekly). Access to digital editions, contests, news, and more are ready for you today!
Underhood Service targets repair shops that derive 50 percent or more of their revenue from the service and repair of under-the-hood systems. The expanding amount of knowledge and capital needed to keep up with technological advances has led these shop owners to concentrate on underhood systems, while also offering preventive maintenance services on most major vehicle systems. By subscribing, you’ll receive the ShopOwner digital edition magazine (12 times/year) featuring articles from Underhood Service and the Underhood Service eNewsletter (twice weekly). Access to digital editions, contests, news, and more are ready for you today!
High underhood temps, increased power demands and vibration can damage alternators or starters. Sponsored by ACDelco.
Don’t settle for “almost” - it matters where the engine is manufactured or remanufactured. Sponsored by ACDelco.
Brake pads are thoroughly developed to produce the best result. This video is sponsored by ZF Aftermarket.
Click here to view past issues.
Get the latest news, insights, and more delivered directly to you inbox.
This type of fuel pump uses voltage switched on and off to control the speed and pressure of the pump. Sponsored by Carter.
Look at this, I have my meter hooked up to this fuel pump, and it only gets five volts when the vehicle is idling! Something must be wrong. But, when I hit this button for the minimum and maximum voltage, I get zero volts for the minimum and 13.85 volts for the max. If I hit this percentage button, I get 35.6 percent. What is going on here? Shouldn’t it be 12 volts or more all the time?
No, this fuel pump in this car uses a pulse-width modulated voltage signal to drive the fuel pump in the tank. This type of pump uses voltage switched on and off to control the speed of the pump and the pressure it produces.
Pulse-width modulation works like this. The longer the power is left on compared to the off time, the more fuel pressure is generated by the pump. The amount of on time compared to the off time can be expressed as a percentage. That percentage is often called a duty cycle or commanded percentage or rate on a scan tool. This is what it looks like on a scope. You can see the square wave as the voltage switches on and off.
With the engine at idle, the duty cycle on the scan tool and the meter is 35.6 percent. Since the injectors have a very short open time, the pressure at the rail remains at 58psi.
If we revved or increased the load on the engine, the duty cycle increases to keep the pressure at the fuel rail between 55 to 60 psi. So on the meter, the voltage might read higher, but the minimum voltage is still zero and the maximum is still 13.85.
How do you use this knowledge for fuel pump diagnostics? Using a scan tool that can graph the fuel pressure and duty cycle together, you can chart the health of the fuel pump. The fuel pressure should remain in a constant range specified by the service information. What will change is the duty cycle of the fuel pump as you accelerate. If the fuel pressure drops below the specified range while the duty cycle is increasing, chances are the fuel pump needs to be replaced.
This video is sponsored by Carter Engineering.
Video: Catalytic Converter Theft (VIDEO)
Video: Efficient Battery And Electrical System Testing (VIDEO)
Video: Catalytic Converter Development Process (VIDEO)
Video: The Relationship Between Toe and Tie Rod (VIDEO)
Technical resources to help diagnose and repair engine-related service issues.