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Features - Actron CP7677 Automotive TroubleShooter - Digital Multimeter and Engine Analyzer

• Includes protective boot, detachable color-coded test leads and alligator clips
• Automatic zero adjustment for volts and amps for accurate measurements
• Automatic reverse polarity indication
• Overload protection on all ranges and fold-out stand for better viewing
• 1-year warranty

For More Information :

You don't have to be a certified mechanic to troubleshoot a diesel engine. All you need is a bit of mechanical aptitude and some basic tools. You have to determine what happened right before the breakdown. This is called the story line, it's a blow by blow sequence of events that will help you determine the cause of the failure.

By the way, if your diesel engine is electronic you may find yourself towing it to a dealer who has a scanner to get the codes out of the On Board Diagnostics System. BUT there are still checks you can perform before you call the hook.

Always check the simple things first!

Diesel engines require air and fuel to run.

This is investigative information that will guide you to a possible solution. You have to ask the driver of the vehicle the following questions.

1. What was exactly going on when the engine quit?

2. Were there any dash gauges or warning lights acting up?

3. Were there any unusual noises?

This will help you get some clues on any contributing factors that could give you some troubleshooting wisdom. If the engine was hesitating or losing power you could be looking at air in the fuel. If the engine just quit instantly you should check the ignition system, fuel transfer pump and engine shutdown solenoid.

Here Are Some Basic Checks You can Follow up With: Mostly for a rough running engine condition before it quit.

1. Is the fuel tank topped up? I know this is a lame question but it's happened before.

2. Is there gas in the tank instead of diesel? Again, I've seen this happen before.

3. Check the fuel filter and make sure it is full of fuel. This determines if you have a fuel starvation problem or not.

4. Check for water in the fuel separator, the first filter closest to the tank. They have a bleed off valve at the bottom of the housing.

5. Check for fuel leaks at the lines and fittings.

6. Check the air filter for any restrictions. This won't cause a no start unless air intake is totally blocked off.

7. Make sure you are getting fuel to the injection pump. Crack a line before the injection pump and crank over the engine to determine if the fuel transfer pump is working.

8. Crack open an injector fuel line at one of the cylinders and crank over the engine.
Are there signs of pressure or a foamy substance? The latter means there is air in the fuel.

By this time you will have determined where the problem is in the fuel system. Once you nail down a general theory to what component is at fault you can do some digging and pick some brains at the local repair shop. These procedures will help you possibly find a problem along the way, get some experience and save a few bucks.

When a car's check engine light comes on, it is a mystery to most drivers. It instills panic in many for good reason. There are times when that light can mean drastic problems in a car's engine system or other operating parts. There are also times when it simply means you changed your brand of gasoline and the car needs to adjust to the new mix. For that reason there is a tendency to ignore that little light and hope the problem will go away.

Should You Worry About Your Check Engine Light?

How do you know if the check engine light is trying to tell you there is a serious problem or if it is nothing to worry about? One way is to take the time out of your busy schedule, drive to the mechanic and pay a hefty fee to have them hook up their machine to your car's OBDII system and then tell you to tighten your gas cap as a result. Or you can get your own OBD diagnostic tool that will give you all the information you need right at your fingertips.

Onboard Diagnostic System

These simple devices attach to your automobile's OBDII (onboard diagnostic system) right under the dash just like the big machine at the mechanic shop does and it will give you the exact same readouts plus provide easy to understand graphs and explanations of those confusing codes your mechanic gives you to keep you in the dark as to what is really going on.

Simply take the OBD diagnostic system for a short ride with you when your check engine light comes on and then take it in the house to your personal computer and download the data. The website provided to you with your OBD diagnostic system will decipher the information and give you all the information you need to determine if the problem is serious or not at fractions of the cost of a mechanic's garage. The readout will also give you simple solutions to the easier fixes if they are available plus if you do need to take the car to your mechanic, you can go in well-armed with the knowledge you need to keep from being overcharged for their services.

The OBD system will also alert you to potentially damaging driving habits you may have acquired over time even when your check engine light is not blinking. Things like hard braking and excessive acceleration so that you can correct problems before they affect your car's mechanisms.

Benefits of OBD

There are even more benefits to your own OBD diagnostic system. Never get stuck with a lemon again by taking it on all of your test drives. With your own diagnostic system, you will be able to find out for yourself if your potential new or used car is in good operating order before you drive off the lot. You can even find out why the check engine light [http://www.carcheckup.com/check-engine-light/] is on. You can also take all the worry out of vacations when you hook it up before a road trip.

Your engine goes through a 4-stroke combustion cycle thousands of times each minute. This cycle generates an enormous amount of heat that threatens to damage the entire assembly. Temperatures can climb to the point where the engine overheats and the fuel within the combustion chambers begins to detonate. This can lead to damage to the pistons, valves, and rings.

Preventing this problem from happening is the cooling system. It is comprised of a network of components, including the radiator, hoses, water pump, and engine thermostat. Coolant flows through this network and into the engine, absorbing heat away from the assembly. It then transports that heat to the radiator, thus protecting your engine from overheating.

At the center of this system sits the thermostat. In this article, we'll take a closer look at the role it plays in the efficient operation of your vehicle. I'll also describe the consequences of this component failing, and offer a few suggestions for replacing it.

The Role Of The Thermostat

When you first start your car, the engine is cold. It requires time to reach its normal operating temperature. While the temperature surrounding the assembly climbs, coolant is kept from circulating through the cooling system. The component responsible for keeping it at bay is the thermostat.

One of the main purposes of the thermostat is to help your engine reach an optimal temperature as quickly as possible. That is when the assembly operates at its most efficient. Once a given temperature (typically 195 degrees Fahrenheit) is reached, the component opens and allows coolant to rush through the hoses toward your radiator. There, it releases heat and circles back to the engine to repeat the process.

What Happens When It Fails?

Even though this part is seldom mentioned, it has an important job to perform. If it fails to do its job, your engine can overheat. For example, the thermostat may remain in the closed position and thus, prevent coolant from flowing to the radiator. As a result, the heat contained in the fluid is not allowed to dissipate. Eventually, rising temperatures overwhelm your engine and cause it to seize. This can occur within minutes.

Suppose the component fails and remains in the open position. In this case, coolant is allowed to flow unhindered, which can cause the temperature surrounding your engine to drop. This, in turn, causes the operating efficiency of the assembly to falter. It should generate a fault code you can pull with a diagnostic scanner.

Replacing The Engine Thermostat

A failing thermostat needs to be replaced rather than repaired. Choose a replacement that has the same temperature rating as your failing unit. Most are set to open at 195 degrees Fahrenheit, but this can vary. Installing a replacement with the wrong setting can lead to excess fuel consumption, wearing around the rings, and other problems.

Most thermostats are located near the top radiator hose. Once you find this hose, detach and remove it. Have a small container ready to catch fluid as it leaks from the opening. You'll notice a few small bolts holding the component in place. Remove those bolts and lift the part from its housing.

Use a scraper to remove the residual gasket material around the exposed surface on the inside of the housing. Place a new gasket inside, install the new thermostat, and replace the top of the housing. Connect the top radiator hose, replace the clamp, and replenish the cooling system with coolant (use a 50-50 blend). This entire job should take less than an hour.

The thermostat's size and nondescript nature make it easy to ignore. But it plays a key role in the smooth operation of your engine. Even though it's a relatively inexpensive auto part (it can usually be purchased for less than ), it can cause expensive damage if it malfunctions.