Repair 7

A wide variety of Ford vehicles come with a program, controlled by the vehicles computer, whose function is to reduce the vehicle to minimal performance standards, in the case of a vehicle component being at risk of failure. This programs informal name is a "limp mode."

Benefits

Limp mode engages when a vehicle sensor indicates that a vital component is not working properly. By modifying the vehicles acceleration and shifting capabilities, limp mode allows drivers to navigate their Ford vehicles home, or to a nearby service station. By allowing the vehicle to continue with limited operation capability, limp mode helps eliminate the cost of towing and dangers of roadside breakdowns.

Solutions

Once a Ford vehicle has begun to operate in limp mode, a driver can rectify its malfunction by taking the vehicle to a mechanic who has the ability to plug into the vehicles diagnostic port and read any problem codes put out by the vehicles computer. After diagnosing the issue and repairing the vehicle, the mechanic will be able to reset the limp mode program.

Warning

Ford vehicles operating in limp mode will not perform according to their normal standards and will be slow to accelerate and maintain speed. Use caution while driving a vehicle in limp mode to avoid causing a traffic hazard and seek assistance to remedy the vehicles performance problems as soon as possible.

The Ford Mustang is an American muscle car which has been in continuous production since 1964. The 1993 Mustang GT was the last year of the third generation Mustangs which began production in 1979. This model has an eight-cylinder 5.0-liter engine with multi-port fuel injection. Each cylinder has its own injector, which delivers fuel to the cylinder in a precise sequence. You can access the fuel injectors from the engine compartment, where they are located on top of the engine.

Instructions

1

Remove the cap on the fuel tank to relieve the pressure in the fuel tank. Attach fuel pressure gauge T80L-9974-A to the pressure relief valve on the fuel supply manifold. Open the pressure gauge to relieve the pressure in the fuel system.

2

Remove the upper intake manifold with a socket wrench. Disconnect the electrical wiring harness for the fuel injectors. Release the retaining clips for the fuel lines to the fuel supply manifold and disconnect the fuel lines.

3

Remove the retaining bolts for the fuel supply manifold and disconnect the fuel rail from the fuel injectors by lifting the fuel rail and gently rocking it back and forth. Disconnect the fuel injectors from the intake manifold in the same manner.

4

Remove the O-rings from the fuel injectors, and replace them if they show signs of damage. Lubricate the O-rings with engine oil and place them onto the new fuel injectors. Install the fuel rail and fuel injectors to the intake manifold. Ensure the O-rings are properly seated by pushing down on the fuel rail.

5

Tighten the retaining bolts for the fuel rail assembly to between 15 and 22 foot-pounds with a torque wrench. Attach the fuel lines to the fuel supply manifold and attach the electrical wiring harness for the fuel injector. Install the upper intake manifold with a socket wrench. Start the engine and check for fuel leaks.

Modern vehicles come with a computer system that helps regulate the way the car runs as well as inform the driver when problems arise. A 2002 Chevy Tahoe uses a computer that can be scanned to indicate if there is a problem with the car. The ability to identify a problem quickly, can save both time and money and enable the driver to complete a repair efficiently.

Instructions

1

Remove the cover from the fuse box. This box is located below the steering column on the drivers side of the vehicle.

2

Plug the diagnostic scanning tool into the 16-pin data link connector (DLC) outlet provided on the left side of the fuse box. Snap it firmly into place but do not force it. If it does not fit correctly the first time, remove and reposition the scanner so that it plugs in correctly.

3

Turn the key in the ignition to "On", but do not start the car. Turn on the scanner and wait for the diagnostic check to be completed. Unplug and remove the scanner and replace the fuse cover.

4

Access the Diagnostic Trouble Codes (DTC) on the scanner using the directions on the diagnostic scanner. Retrieve the stored code. Match this stored code to that in the owners manual to determine the Tahoes computer reading.

5

Repair or replace the parts needed to ensure the proper running of the Tahoe.

The use of paint codes, whether you have a scratch or huge dent, ensures that in painting, restoring or repairing the exterior of your Volkswagen, you will get a precise match of your autos original color.

Location

The location of the paint codes varies depending on the make, model and year of your VW. The two-to-four number/letter digit code is usually under the rear trunk, under the trunk mat or in the spare tire wheel well.

Other Paint Code Sources

If you are unable to locate your paint code anywhere on your vehicle, check your owners manual. If the information is not available from that source, call a VW dealership, give your Vehicle Identification Number (VIN) and have the dealer look it up for you.

Benefits of Paint Codes

Paint codes will ensure that you are using the correct color. Do not try to match your paint without these codes; even experts will be unable to do an effective match without the correct information. Even if you try to match colors on the Internet, the quality and shade of the color shown will depend on your computer.

The Duramax is a series of eight-cylinder diesel engines manufactured by General Motors and Isuzu since 2001. General Motors uses these engines in larger, heavy-duty trucks. For example, the 6.6-liter Duramax is an engine option in the 2002 Chevrolet Silverado 2500HD pickup truck. The water pump circulates coolant around the engine to prevent it from overheating. The water pump on a 2002 Duramax diesel engine is on the front of the engine and is accessible from the left-front wheelhouse of the vehicle.

Instructions

1

Disconnect the inner panel for the left-front wheelhouse with a socket wrench. Place a drain pan under the radiator drain, and remove the radiator drain plug. Drain the coolant into the drain pan, and replace the drain plug.

2

Disconnect the housing for the thermostat and the clutch for the cooling fan with a socket wrench. Remove the balancer from the crankshaft. Disconnect the mounting nuts for the outlet hose, and detach the hose from the water pump. Disconnect the retainer for the engine wiring harness from the outlet hose of the water pump.

3

Remove the mounting bolt from the water pump with a socket wrench. Record the locations of each bolt, since they have different lengths. Detach the water pump and its gasket from the engine.

4

Lubricate the gasket for the water pump with engine oil, and replace the gasket. Install the new water pump and tighten its mounting bolts to 15 foot-pounds with a torque wrench.

5

Connect the retainer for the engine wiring harness to the outlet hose for the water pump. Attach the outlet hose to the water pump and tighten its mounting nuts to 15 foot-pounds with a torque wrench. Replace the thermostat housing and crankshaft balancer with a socket wrench. Install the clutch for the cooling fan.

6

Fill the radiator with coolant. Replace the inner panel for the wheelhouse in the left-front fender.

The two-stroke motorcycle engine is a contradiction. Despite their bare-bones mechanical simplicity, they tend to require far more attention to keep them performing than their larger brothers. Oil must be caully added to the fuel mixture in the correct proportions, and regular rebuilds are not uncommon. Following such a rebuild, it is advisable to complete a period of Running-In to ease the engine back into performing, without putting it under sudden strain. There are countless interpretations of how to do this, but several principles hold true across all of them.

Instructions

1

Start the bike, and allow it to idle for a few minutes until the engine is up to temperature. Do not lean the bike on its side stand, as this will cause the oil to collect in one side of the crank case. Use the center stand, or sit on the bike if it does not have one. Turn off the bike. An important characteristic of the running-in process is gradually increasing the periods of time for which the bike is running. Once it has cooled enough to touch, start it again.

2

Ride the machine for a short 5- to 10-minute run, keeping the throttle below 50 percent, and ensuring that all other components; brakes, shifting, steering, etc.; are all functioning OK. Return home, and allow the bike to cool down completely again. This will generally take at least 30 minutes, but the longer the better. You should be able to touch the pipes and radiator without feeling any residual heat.

3

Start the bike again, and head out for another ride. This time, the throttle can be pushed to 60 percent. After 10 to 15 minutes, return home again, and allow the bike to cool once more. Repeat this process another four times, increasing your throttle limit by 10 percent on each run, every time allowing the bike to cool down completely every time.

4

Ensure all fasteners are still fully tightened. Your two-stroke engine should now be ticking over smoothly. Allowing the engine to properly cool after each run helps small quantities of oil to act as a seal at the points where different components meet, reducing the possibility of damaging the pistons.

Although not essential, all modern gasoline automobile engines depend on exhaust gas recirculation or EGR valves to reduce toxic nitrogen oxides from emissions. The removal of EGR valves, while long debated, has not been shown to have any performance benefits.

Function

Dangerous nitrogen oxide gases form when gasoline combustion chambers reach temperatures in excess of 2500 degrees Fahrenheit. To combat this, the EGR valve was introduced in 1973 by General Motors to recirculate exhaust gases into the combustion chamber, drastically reducing temperatures and the formation of nitrogen oxides. EGR valves do not function at idle or wide open throttle and generally increase fuel economy and performance.

Disconnecting the EGR Valve

For some, the benefit of more engine bay space is enough to make removing the EGR valve worthwhile. In order to do so without interferring with engine operation, the engines electronic control module (ECM) must be set to never activate the missing EGR. Additionally, an EGR plate must be installed to cover the hole in the intake manifold where the EGR valve was installed.

Considerations

On most cars a missing EGR valve will cause the vehicle to fail emissions testing because of a tripped check engine code and the presence of heightened levels of nitrogen oxides.