The car started moving without any problems
1. Before starting to move, you must fasten your seat belt.
2. Always try to start moving smoothly, since while the car has a minimum speed, the load on all elements of the transmission and chassis is maximum. Therefore, to avoid premature wear, it is necessary:
- a) If the car has an automatic transmission, do not press the accelerator pedal sharply.
- b) If the car has a manual transmission, do not release the clutch pedal abruptly. When starting to move, do not hold the clutch pedal for a long time.
- c) Do not make a sharp start with the steering wheels fully turned. If the car is front-wheel drive, this can damage the boot and/or the CV joint (constant velocity joint), overloading it excessively.
- d) If you are starting off on an incline, it is recommended to use the parking brake (in some cases, modern cars are equipped with systems to assist when starting on an incline).
Jerks when starting the car
1. Malfunction of the fuel system and air intake system (see chapter "Fuel system" and "Intake and exhaust system").
2. Clutch malfunction (manual gearbox) (see chapter "Clutch"). If the clutch slips when starting off, this indicates excessive wear or a violation of the free and working travel adjustments of the clutch pedal. When the clutch slips, a characteristic smell of friction materials of the driven disk of the clutch is possible (this smell can also appear with a working clutch, if you hold the clutch pedal half-pressed for a long time, already when starting off).
3. Violation of the valve timing (see above) (see the chapter "Mechanical part of the engine"). In this case, the "CHECK ENGINE" indicator may turn on
.
4. Failure of the cardan transmission as a whole (see the chapter "Drive shafts"), its increased wear (cars with a manual gearbox and a drive on both axles or only on the rear). Repairs should be carried out exclusively at a service station. In this case, jerks may be absent, but at the moment of starting the movement, a dull metallic knock will be heard (usually these are two blows), then with each gear shift.
5. Malfunction in the engine management system or in the transmission control system (cars with automatic transmission). In this case, the "CHECK ENGINE" indicator may turn on and/or a message may appear on the on-board computer screen (if the car is equipped with one). You should immediately contact a service station.
6. Detonation in engine cylinders (petrol only). The most common cause of detonation is poor-quality fuel. In this case, a characteristic metallic knock will be heard from the engine. It is necessary to change the place of constant refueling of the car or switch to higher-quality fuel. Constant detonation is very harmful to the engine and can lead to breakage or violation of the geometric parameters of the connecting rod and piston group and crankshaft, so do not delay in finding out the cause of this malfunction and its prompt elimination.
However, it is worth considering the fact that during or at the beginning of the movement, with a sharp opening of the throttle valve for maximum acceleration, detonation knocks may appear for 1-2 seconds, this is not a malfunction. In this case, the cause is a sharp change in the ignition timing (to an earlier one) to optimize the engine's operating processes and complete combustion of fuel.