![]() ![]() Increasingly strict emissions regulations are causing many automotive manufacturers to use VVT systems. There are many ways in which this can be achieved, ranging from mechanical devices to electro-hydraulic and camless systems. It is increasingly being used in combination with variable valve lift systems. In internal combustion engines, variable valve timing ( VVT) is the process of altering the timing of a valve lift event, and is often used to improve performance, fuel economy or emissions. This engine uses continuously variable timing for the inlet valves But, it can also throw error codes and bring on the dreaded, check engine light.Process of altering the timing of a valve lift eventĬylinder head of Honda K20Z3. However, you can buy an aftermarket performance chip, that has a different timing map flashed into it.īe careful because, the wrong chip can not only make your car run badly. In fact, you usually can’t, unless you remap your ignition computer’s chip. So, as long as your sensors are all functioning properly, you won’t have to do any tinkering with timing. ConclusionĬonsequently, newer engines adjust the ignition timing themselves. Distributorless Ignition System (DIS) ( No Moving Parts )Īs you can see, there have been great advances over the years.The Electronic Ignition System ( The Transition System ).The Mechanical Ignition System ( No Electronics ).There Are Basically, Three Distinct Types, Of Ignition Systems: If the spark fires late, the piston is already on the way down, generating less power and wasting fuel. In addition, this will also cause the fuel economy to suffer. Increased Fuel ConsumptionĬonsequently, if the spark fires at the wrong time, it will result in improper combustion. This causes the engine, to generate more heat than usual. Igniting the air-fuel mixture too early, in the power stroke can cause this. And, cause the vehicle to experience difficulty, while starting. But, in both cases, the engine will not produce the optimal power. This can be either, due to an advanced or delayed ignition. So, to prevent engine knocking, modern engines use knock sensors. In these cases, the spark fires when the engine, is still in its compression phase. Incorrect ignition timing, can cause several engine problems, such as:Ībove all, this is one of the most common symptoms, of incorrect ignition timing. What Can Happen With, Incorrect Ignition Timing As a result, any problems with it, can cause issues with the drivability and performance in your engine. So, the (ESC) module plays an important role, in the operation of the engine. Almost, to the point where they are, virtually unnoticeable. Meanwhile, the (ESC) module, makes these changes automatically and smoothly. And, to increase power and will retard it, at low throttle. So, under heavy load, the module will advance the timing. Consequently, is to advance or retard the timing of the ignition system. In other words, one of the specific functions of the (ESC) module. And, is used to set the engine’s ignition system, for the best performance and efficiency. So, the ignition control module, works together with the computer. Electronic Spark Control ModuleĪlso, known as, the (ESC) module or the ignition module. Then, the computer will send a signal to the ignition coil, at the indicated time in the timing map. And, is used for all combinations, of engine speed and load. The computer has, a timing map with spark advance values. Newer engines typically use, computerized ignition systems. So, by connecting a vacuum gauge, to a strong vacuum source, lower than normal readings, could indicate incorrect timing. Incorrect ignition timing, also affects manifold vacuum readings. Using A Vacuum Gauge, To Test For Incorrect Timing Whereas, modern engines, have the Engine Control Unit (ECU), to dictate the advance needed, at a given engine speed. Consequently, they used either, vacuum advances or centrifugal advances, to set the right advance timing. So, back in the day, most older engines had, manual ignition timing. Then, the ignition timing is said to be, retarded. However, if the spark ignites the fuel, after the piston reaches (TDC).Then, the ignition timing is said to be, advanced. So, if the spark ignites the fuel, before the piston reaches (TDC).Consequently, this measurement is better known as, advanced or retarded timing. This is always before or after, the piston reaches the top dead center (TDC). ![]()
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