Car Automotive

Posts Tagged ‘vehicles’

Those readers with experience of working on different makes of vehicles will know that the range of differences that are to be foundwithin computer controlled systems makes it virtually impossible to cover all different systems in one volume.Changes in computing technology and electronics occur frequently and this means that the design of computer controlled systems on vehicles also changes quite frequently as new designs incorporate the new technology.

This means that data and information is frequently updated and it is a major task to keep abreast of these changes. Technicians in franchised dealerships are normally notified of changes and, with modern technology, this updating can be done rapidly. In the case of the general garage workshop, technicians will probably have to rely on data and information from specialized companies.

An updating and information back-up service is offered by companies such as Robert Bosch Ltd and Lucas Aftermarket Operations etc. Whatever the case, it is essential that the information that relates exactly to the system that is being worked on should be readily to hand and that all procedures are properly understood before work commences.

From time to time, reports circulate about vehicles that have failed an exhaust emissions test. Often, it seems that an assumption has been made that the exhaust catalyst is defective, a new catalyst has been fitted and when retested the vehicle still fails the exhaust emissions test. From this point things can often get worse. It is, therefore, useful to make an examination of the techniques that should prevent such misdiagnosis from happening.

The pre-catalyst oxygen sensor is an important element in the control system that regulates the mixture strength (air–fuel ratio) in spark ignition engines. the oxygen sensor samples the exhaust gas before it enters the catalytic converter and produces a signal that tells the ECM the air–fuel ratio of the mixture that is entering the combustion chambers. It is a feedback system.

The oxygen sensor signal is used by the ECM to change the amount of fuel injected so that lambda is kept in the range of approximately should remind you of the principle.Should the oxygen sensor be disconnected, there will be no feedback to the ECM, which will probably have been programmed to use a substitute value to cause the ‘limp home’ mode to operate and to minimize the possibility of damage to the catalyst. Add to this the fact that, like the catalyst, the oxygen sensor needs to be at an operating temperature of over 300?C for it to operate efficiently, and it becomes evident that electrical testing of the oxygen sensor is work that requires care and attention to detail.

Lubricants are essential ingredients for motor vehicles. Choosing and using a good lubricant and correct for your vehicle, is the right step to take care of machinery and equipment vehicles that are not easily damaged and prevent waste. General opinion that the primary function of oil is a lubricant.

Though oil has other functions that are not less important, ie, among other things; Cooling, Patron of Rust, cleaner and Closing the Gap on Wall Machinery. All these functions are very closely related; as lubricants, oil will create friction between the components in the engine move more subtle, making it easier for machines to achieve the ideal working temperature. In addition Oli also acts as a heat transfer fluid that reaches the engine 1000-1600 degrees Celsius to other parts of the engine cooler.