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Reference and Technical Data for Auto Repair

Proper information is important when working on your car. Use these reference pages to brush up on technical jargon with out complete auto repair dictionary, database of OBD and OBDII DTC Codes, timing belt information and more.
  1. Auto Repair Dictionary (29)
  2. Firing Order Reference (25)
  3. Timing Belt Data (2)

The Difference Between a Sunroof and a Moonroof
The real difference between a sunroof and a moonroof, without all the hocus pocus.

Trailer Wiring Diagram and Color Chart
This is the trailer wiring colors and location on a standard trailer wiring harness. If you need to know what color wire goes to what, see this chart.

How Does An Alternator Work?
How does an alternator work? What does an alternator do? If you've ever wondered what's going on inside your alternator, read up here.

Buying a Repair Manual: Choose the Make of Your Car
Before you start working on your own car doing your own repairs or maintenance, you need a good repair manual. Having a proper automotive repair book will mean your repairs will happen quickly and reliably. Let me help you find the best repair manual for your car so you can get down to the business of auto repair!

Buying a Repair Manual: Choose the Make of Your Car
Before you start working on your own car doing your own repairs or maintenance, you need a good repair manual. Having a proper automotive repair book will mean your repairs will happen quickly and reliably. Let me help you find the best repair manual for your car so you can get down to the business of auto repair!

Buying a Repair Manual: Choose the Make of Your Car
Before you start working on your own car doing your own repairs or maintenance, you need a good repair manual. Having a proper automotive repair book will mean your repairs will happen quickly and reliably. Let me help you find the best repair manual for your car so you can get down to the business of auto repair!

What's This Fluid Dripping Under My Car?
Identify what is dripping under your car with this informative guide with pictures and smells. Very handy!

What is a Helical Gear?
What is a helical gear? It's in your transmission. See this photo of a helical 4th gear to see for yourself.

ABS Brakes and the Facts
How does ABS work? What is my antilock braking system doing? Here is a guide to the ins and outs of your car's ABS brakes and the system that runs them.

What is Ride Height, Set Back, Kingpin Offset
If you hit a serious bump you might need to get an alignment. Alignments are not expensive usually, and include adjustments of suspension like camber, caster, toe in, toe out, thrust, and 4-wheel alignment. Let us show you definitions of what all of these things mean to you and the health of your car or truck. Kingpin offset, set back, and ride height included.

What is Thrust Angle, Included Angle and Steering Axis Inclination?
If you hit a serious bump you might need to get an alignment. Alignments are not expensive usually, and include adjustments of suspension like camber, caster, toe in, toe out, thrust, and 4-wheel alignment. Let us show you definitions of what all of these things mean to you and the health of your car or truck.

What is Toe In or Toe Out?
What is Toe In? If you hit a serious bump you might need to get an alignment. Alignments are not expensive usually, and include adjustments of suspension like camber, caster, toe in, toe out, thrust, and 4-wheel alignment. Let us show you definitions of what all of these things mean to you and the health of your car or truck.

What is Camber?
If you hit a serious bump you might need to get an alignment. Alignments are not expensive usually, and include adjustments of suspension like camber, caster, toe in, toe out, thrust, and 4-wheel alignment. Let us show you definitions of what all of these things mean to you and the health of your car or truck.

What is Caster?
If you hit a serious bump you might need to get an alignment. Alignments are not expensive usually, and include adjustments of suspension like camber, caster, toe in, toe out, thrust, and 4-wheel alignment. Let us show you definitions of what all of these things mean to you and the health of your car or truck.

Wheel Alignment Defined
If you hit a serious bump you might need to get an alignment. Alignments are not expensive usually, and include adjustments of suspension like camber, caster, toe in, toe out, thrust, and 4-wheel alignment. Let us show you definitions of what all of these things mean to you and the health of your car or truck.

What Type of Headlight Bulb Is This
IF you don't know what type or size headlight you have, you can use this chart to identify your old bulb, then go to the parts store or order online. Quick and easy. Halogen and old school.

Identify Your Headlight Bulb
Don't know what type of bulb your car takes? We'll show you how to identify that dead headlight bulb in a hurry.

Your Ignition System, How Does it Work?
Your ignition system is an essential component to your car's engine. Without an ignition coil, distributor cap, rotor, spark plug wires and spark plugs, you can't do much at all with a tank of gas. So how does your ignition system work? It helps to know how things work when you need to troubleshoot them, so learning about your car's ignition system (which consists of the ignition coil, distributor and cap, rotor, spark plug wires, spark plugs and, in newer cars, an ECU (computer).

EGR Valve
The EGR valve is a crucial part of your car's emission control system. The EGR valve was an invention that made your car more efficiently burn its fuel and create fewer emissions. Do you need to know what an EGR valve is? Do you wonder whether you can replace your EGR valve? We'll help you out.

How Does Fuel Injection Work?
Fuel injection was a marvel of automotive engineering. Single port and multi port fuel injection systems save fuel and add horsepower. They are much greener and more environmentally friendly than carburetors. How do fuel injection and fuel injectors work? What is a fuel rail? These are easy to answer when we make it simple.

What is a Fuel Injector
Cars these days run fuel injection systems. But what is a fuel injector? A fuel injector is the last stop for gas in your fuel injection system. That and spark plugs.

Air Conditioning: How AC Works
If you understand your car's air conditioning system you can maintain your car's air conditioning system. A/C is not hard to work on if you understand how it works. Check out this A/C description and you'll be the air conditioning know it all.

Air Conditioning Dye Test
Warm air conditioning can be caused by a leaking air conditioning system, causing a freon leak. A common air conditioning leak test is a pressurized dye test.

How Does My Cooling System Work?
Your cooling system consists of many parts, including your radiator, water pump, coolant, electric cooling fan and other parts. Understanding how your cooling system works is very important to understanding how to troubleshoot your cooling system if you have an overheating problem. Overheating can be avoided through good troubleshooting and understanding.

What Exactly is a Catalytic Converter?
Your catalytic converter is an important part of your car's emission control or catalyst system. No vehicle is a green vehicle if it has pollutants pouring out of the back thanks to a clogged catalytic converter or a catalytic converter that isn't working in conjunction with your oxygen sensors.

The Plus One Tire Theory
You've heard car guys talking about a "Plus One" tire setup, but what are they saying, and why are they saying it?

What is a reverse-threaded bolt?
What does reverse threaded mean? Does my car use a reverse threaded bolt? When threads are reversed it can be confusing, so be sure to find out which ones go which way. we can at least help with a definition of reverse threads along with a barrel of other auto repair tips.

Push Screw
Trim panels can be held on with these type of push screws.

Honda's Rube Goldberg Experience
Award Winning Honda Car Commercial made auto parts history. Rube Goldberg machines are exciting, Honda made this ad to highlight the Rube Goldberg machines history and honor the Rube Goldberg concept. Your Auto Repair Questions Answered by your About.com Guide to Auto Repair:

Ford 3.6 Liter V6 Cylinder Firing Order and Timing Marks
Firing order for Ford 3.6 liter V6 engines. Also timing marks location.

Money
It's all about the money, but in the Automotive Empowerment Zone, it's all about saving money.

HFO-1234yf is the Green Alternative for your Car's AC System
Is there a green alternative for use in your car or truck's air condtioning system? According to the experts, HFO-1234yf will reduce your AC's impact on the environment by more than 300 times. Wow.

Ford V8 Oxygen Sensor Locations Diagram
This diagram shows the locations for Ford Explorer and simmilar O2 sensor locations. If you are trying to locate or replace your oxygen sensors in your Ford, this chart will tell you where they are located.

Typical CV Joint Assembly Diagram for Replacement or Repair
If you are preparing to work on your car's CV joint, this diagram will show you how it is assembled, taken apart, repaired, and what parts are involved in your CV joint. Your clicking CV joint may need repair or replacement. This explanation of a common CV joint will help guide you. No more clicking or noisy CV joints!

Folder for Reference Pics Used Often in Auto Repair
This folder contains pics often referenced for auto repair. It will grow and grow.

Volkswagen Jetta Fuse Location Diagrams
This is a fuse map with amperage and other important information about fuses for your Volkswagen Jetta 1999 and newer.

1997 Chevy 3.1 Liter EGR Valve Location
This diagram shows the location of the EGR valve on a 1997 Chevy 3.1 Liter engine. It is similar in other years and models, so check it out to find your EGR valve.

Honda Accord EGR Valve And Coolant Temperature Sensor Locations
This photo shows the location of the EGR valve and coolant temp sensor on Honda engines.

OBD and OBD-II Code Listing
Redirect to OBD-Codes.com

Chevy 3.1 Liter EGR Valve Location
This illustration shows the exact location of the EGR valve in your 3.1 Liter Chevy V6. If your Camaro, Lumina or other Chevy V6 needs EGR valve cleaning or replacement, here you are.

Ford Oxygen Sensor Locations for 4-Cyl and V8
This chart shows the location of O2 sensors in your Ford engine. Covers 5.0 Liter V8 and 4-cylinder engines.

How Does a Diesel Engine Work?
If you've ever wondered how a diesel engine works, and what the difference is between a diesel and a gas engine, here is a quick primer for you.

What is Ignition Timing and Cam Timing?
If you're doing a tune up, or you have just replaced your timing belt, or installed a new head gasket, or anything else that involved your timing belt, you're going to need to set your ignition timing. Understanding what timing is can be a huge help.

How to Safely Drain Your Gas Tank
Draining fuel safely and cleanly from your fuel tank, whether it's due to bad gas or an upcoming repair.

My Car Failed Inspection, Now What?
If your car has failed either your state safety inspection or an emissions inspection and test, you need to know what to do. Here is the info for every state that has a vehicle inspection law.

Diagnosing the Great EGR Error Code
Error Code P0401, your Check Engine Light, and how to avoid spending money to clean your EGR system.

Do You Need a Fuel Additive like Dry Gas?
Is it a good idea to use a guel additive in your gas tank to maintain the moisture level in your gas?

Body Repairs You Can Do at Home
Simple car body repairs can be made at home for very little money compared to what you'd pay at the body shop. If you want to tackle the job yourself, here are some guidelines to help you decide how to go about it, and if it's a job you can do. From dents to scratches, from filler to paint, it can all be done to some degree in your driveway.

Automotive Metalworking: Here we Go!
Working on sheet metal for your car or truck is not as hard as it seems. Sometimes all it takes is a little knowledge and the guts to jump in.

An Introduction to Auto Body Welding and Equipment
If you're thinking about trying your hand at automotive welding, here's an introduction to the types of equipment that are available to you, how much they cost, and how hard they are to use.

How Does a MIG Welder Work?
Check out the basics of MIG welding and see how the pros get metalworking done.

Should I Buy a TIG Welding Setup?
What is TIG welding, and how is it different from the other types of welding and equipment?

Glossary of Welding and Welder Terms
This welding glossary contains short definitions of many common welding terms and tools.

How Does a Diesel Engine Work and Why is it Efficient?
Why is a diesel engine more efficient than an equivalent gasoline engine? What is a turbo diesel? There are a lot of physics in the answer to these questions, but I'll skip the high tech talk and give you the quick and easy explanations. It's interesting!

Basic Equipment for Welding Safety
Auto-darkening welding helmets and their importance to your safety.

Three Ways to Hot Cut Your Metal
There are three main ways to cut metal using heat -- an oxy-acetylene torch or a plasma cutter. Very different tools to accomplish a task in two very different ways. Check it out.

Use a Fuel Stabilizer for Winter Car Storage
This is why you should use a fuel stabilizer while your vehicle is in storage for the season. It's the best method.

Does Your Truck Need a Transmission Cooler Upgrade?
A transmission cooler can help keep things cool under pressure, and keep you on the road. Consider getting one?

The Philosophy of Snow Tires
There's a philosophy or two behind tire choices. Snows especially.

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