Failures when pressing on the gas. The failure of the gas pedal

The failure of the gas pedal – a rare phenomenon today. However, if you notice that your iron friend started to twitch when pressing the gas, do not postpone the solution of this problem for later.

In today's article, we learn the causes of this phenomenon and consider ways of solving this problem.

What is this?

Fail if the driver presses the accelerator – the sudden failure of the internal combustion engine, which can occur in any of the modes and loads. Sometimes it can be accompanied by sudden braking of the car and its stop. There are several types of this phenomenon:

• Short dips when you press the gas pedal (about 2-3 seconds).
• Twitch (a series of jerks when driving).
• Deep failure (may take up to 10 seconds).
• Dash (1-2 seconds).
• Rocking (series of failures).

Possible causes

Often this problem is associated with spontaneous change of the rotational speed of the crankshaft. The latter may produce momentum, regardless of accelerator position. I mean the problem is accompanied by delay of response of the motor to the pressing of the accelerator.

The Jerks and dips when you press on the gas can occur during acceleration, at the beginning of the movement, at a constant stable position of the accelerator. To determine the true cause of this phenomenon yourself (after checking the condition of sensors) or by using diagnostic equipment. Most often, the jerks and failures occur due to abnormal fuel pressure in the rail. Also the problem may be in faulty MAF (sensor mass air flow) or TPS (unit TP). These two mechanisms are responsible for mixing and feeding the specific portion of. Break these sensors are rare, but failures when you press on the gas often occur because of their fault. Sometimes they are just clogged contacts.

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Failures when moving

Yanking the car at the moment when he starts to move, comes, as we have said, because of a delay in the response of the engine on the pedal. The breakthrough occurs when you open throttle, that is, when the signal of the TPS electronic control unit determines the moment of transition from the idle to the load mode. At this time, the fuel supply should be as high as possible. If the system has not provided the normal pressure level, the machine is unable to continue the course – she stops and stalls. For the ECU the location of the pedals in the car does not matter, as all of the action with the filing and analysis of electronic signals are carried out automatically.

For the same reason (low pressure fuel) the machine can not go on acceleration. Here, the control unit, as in the previous case, tends to increase the flow of fuel, giving a signal to open the throttle. But because of the small pressure palpable failures, and accordingly, the speed reduction while driving.

Failures on speed: what to do?

If the car has picked up speed and is moving at a stable speed, but suddenly it failed, it was caused by a malfunction in the ignition system. In this case, it is necessary to make its diagnosis. It is done in the following way.

You must First turn off the ignition, continue to pay attention to the reliability of the mounting pad of the wiring harness to the ignition coil. At startup, the motor should emit a characteristic cod (if this occurs, there is breakdown of the high voltage).

Often failures when it happens because of the defective spark plugs. With candle key Unscrew each of them and evaluate the external condition. At the end should be free of soot and acid. The capacity element to the formation of sparks is determined by the ignition tester (for example, domestic appliance “Test-M"). If after installing new spark car again jerks when driving, inspect the position sensor of the throttle. Failure of this mechanism can report such features as:

• A Sharp decline in engine power.
• Uneven idling.
• Changes in fuel consumption.

Making engine

This phenomenon can also cause failure at the sharp pressing the gas. The fact is that when making the engine 4 not running 1 or 2 cylinders. Hence all the ensuing consequences. Below we list the main signs of this phenomenon:

• Weak dynamics of dispersal (even at high revs).
• Change the exhaust sound.
• Uneven engine work at idle, a small “shake” engine.
• High fuel consumption. It can increase by 20 or even 50 %.
• Darkening of one or several spark plugs.
• Fixed jumps when driving and acceleration.

As you can see, the device of the car is that the motor itself will let you know in case of any failure. Most often this happens due to the incorrect installation of the moment of ignition. Also making occurs when faultycandlelight. The latter does not emit sparks for ignition of the mixture, resulting in poor acceleration and increased fuel consumption. Rarely the problem is caused by worn piston rings or burnt piston/valve.

To solve this problem, you must determine which of the cylinders stopped working. To do this, alternately remove high-voltage ignition wire from spark. But this is done with the utmost care, as there is a risk of destruction of the body current. After removing one of the wires the engine speed is increased up to 1.5 thousand. The valve cylinder is also removed in turn. If the sound of the motor has not changed, it means that cylinder is working correctly, and searches of non-performing element continues on. And so until then, until you found the faulty mechanism.

Diagnostics of high-voltage wires

As this item is an integral component of the ignition system, it should also be diagnose. For this we need to remove the tip that is worn on the candle. The wire itself is in a special winding. Its tip has a special hard Nickel. Through the last part the current will then flow to the candle. So, lived this wire should be as to fit snugly to the penny. Over time, this place can oxidize, causing the electricity is cut or partially occurs, which causes a tripling of the engine.

How to check oxidation contact? This is done as follows. The Central core of the wire is connected to the second multimeter probe. If the values on the device has not changed, so this place has a bad contact. In this case the damaged area is trimmed to 0.5-1 cm. Sometimes the tendon of the wire may be deformed or oxidized not on the tip, and near it. In this case you need to cut the cord as long as the multimeter will show the voltage (of course, if the length of the mechanism allows it).

Corrector gas pedal

Some motorists in order to reduce failures when pressing on the gas, set the so-called correctors. They can be purchased at a price from 3 to 10 thousand rubles. Such devices electronically shorten the course of the accelerator. The location of the pedals in the car is not changed. Usually the correctors are removable keychain manage and operate in three modes (“Sport”, “the Speaker” and “Economy”).

Basically, the problem with the jerks this device does not solve, because installing it only to avid fans of tuning. By the way, after this upgrade, many drivers complain which is already hard to drive in traffic jams – the machine starts to twitch even more.

Conclusion

So, we considered the characteristics of failures when pressing on the gas pedal and figured out how to resolve the issue with your own hands. As you can see, in order to cope with this problem, it is not necessary to go to the body shop. At least enough, superficially to know the inner workings of the car.