The ignition system is a key node of the gasoline engine, responsible for the timely ignition of the fuel-air mixture in the cylinders. Without its correct operation, the engine will either not start at all, or will function intermittently, losing power and increasing fuel consumption. Understanding the device of the ignition system helps not only to diagnose problems, but also to correctly approach the choice of spare parts during repair.

Modern cars are equipped with different types of systems – from outdated contact to advanced electronic with individual coils for each cylinder. However, the basic principles of operation remain similar: the generation of a high-voltage pulse, its distribution through candles and the formation of a spark at the right moment. In this article, we will understand ignition system componentsTheir purpose, as well as typical signs of malfunctions that will help you respond quickly to problems.

Main types of ignition systems: from contact to electronic

The evolution of ignition systems went parallel to the development of the automotive industry. The first internal combustion engines used primitive mechanical systems, which eventually gave way to electronic solutions. Today, there are three main types:

  • πŸ”§ Contact system obsolete design with a mechanical interrupter (trumbler), used on cars until the 1990sVAZ-2101, Moskvich-412).
  • ⚑ Contactless system Instead of the interrupter, a Hall sensor or inductive sensor is used, and the switch is engaged in management (VAZ-2108-21099, GAZ-3110).
  • πŸ“± Electronic (microprocessor) system - fully controlled ECU (electronic control unit), without an allocator (All modern foreign cars and domestic cars after the 2000s).

Each type has its pros and cons. For example, a contact system is easy to repair, but requires regular adjustment of the gap in the contacts and replacement of worn parts. Contactless is more reliable, but sensitive to the quality of wiring. Electronic systems require little maintenance, but their diagnosis is impossible without a scanner.

An important nuance: on cars with gas-cylinder equipment (HBO), the ignition system works in more severe conditions due to the increased combustion temperature of the gas, which accelerates the wear of candles and high-voltage wires.

Components of the ignition system: disassemble by parts

Regardless of the type, any ignition system consists of several key elements. They can be divided into three groups:

  1. Power sources - battery and generator, providing low-voltage power.
  2. High voltage generation devices - a ignition coil (or a coil module) that converts 12V to 20-30 kV.
  3. Distribution and enforcement mechanisms candles, wires, tramblers (in old systems) or ECUs (in modern ones).

Let’s look at each element in more detail.

1. Battery and generator

The battery supplies the initial voltage to the ignition system at the start of the engine, and the generator supports its operation after start-up. The voltage must be stable. - if the drawdowns are below 11.5V, the coil will not be able to generate sufficient spark. This is especially important for diesel engines with a system. glow plug (candles of incandescent), where the voltage affects the preheating.

2. Ignition coil

The heart of the system converts low voltage (12V) into high voltage pulse (up to 30,000V). Modern cars are often used in coil-module (one for each cylinder pair) or individual coils on each cylinder (coil-on-plug). The latter minimize energy loss in wires and increase reliability.

Signs of a coil failure:

β€’ Engine "troit" (ignition skips in one cylinder).

β€’ Loss of power during acceleration.

β€’ Lights up Check Engine faulty P0300–P0308 (ignition skips).

3. Ignition distributor (Trumbler)

An outdated element that is found only in contact and contactless systems. The trambler performs two functions:

β€’ Distribute high voltage candles in accordance with the order of operation of the cylinders.

β€’ Regulate. the moment of ignition (avantage angle) with the help of centrifugal and vacuum regulators.

⚠️ Attention: On cars with a tramblor (VAZ-2106, UAZ-469) an incorrectly set ignition advance angle results in detonation which destroys the pistons and valves. Check the setting at idle with a strobe or spark.

4. Ignition plugs

The executive element where the spark is formed. The stability of the engine depends on their condition. The main parameters of candles:

β€’ The kalyl number (cold/hot candles).

β€’ Clearance between electrodes (usually 0.7–1.1 mm).

β€’ Electromaterial (copper, platinum, iridium).

The recommended interval of replacement is every 30-50,000. km (for ordinary candles) and up to 100 thousand km for platinum/iridium. Signs of wear and tear:

β€’ Load on electrodes.

β€’ Erode or melt the central electrode.

β€’ Oil deposits (indicates problems with oil caps).

πŸ“Š What kind of ignition system does your car use?
Contact (with the tramblor)
Contactless (with switch)
Electronic (with ECU)
I don't know.

Connection Schemes: How Everything Is Connected

The basic scheme of the ignition system depends on its type. Below is a simplified scheme for a contactless system (in an example). VAZ-2109):

Component Connection Appointment
Battery. "+" on the coil, "-" on the mass Powering the system
Ignition coil The plug "B" - +12V, "K" - on the switch High voltage generation
Switch Control wires from Hall's sensor Formation of impulses for the coil
Hall's sensor. Swimming connector Reading of the position of the camshaft
Candles. High-voltage wires from the coil / tampler Ignition of mixture

In electronic systems (e.g. on the Toyota Corolla E150) no distributor - the ECU independently determines the moment of ignition from the crankshaft, camshaft and detonation sensors. The scheme is simplified, but requires accurate diagnosis in case of malfunctions.

πŸ’‘

If after replacing the candles the engine is unstable, check the order of connection of high-voltage wires. On the tramblor lid or coil module, there is usually a marking of cylinders (1-2-3-4).

Signs of failure of the ignition system

Problems with ignition appear immediately and unequivocally. Here are the most common symptoms:

  • πŸš— The engine won't start. - no spark (check the coil, switch, Hall sensor).
  • πŸ”₯ Ignition skips ("trotting") - a candle, wire or coil of a particular cylinder is faulty.
  • ⚑ A faint spark. Low voltage from the battery / generator or breakdown in the wires.
  • πŸ“‰ Loss of power - the wrong angle of ignition advance (on old cars) or sensor failure (on new ones).
  • πŸ’₯ Detonation ("knocking fingers") - too early ignition.

For diagnosis, use:

  • πŸ”§ Multimeter - checking the resistance of the coil, wires, voltage on the battery.
  • πŸ” Candle key - Checking the condition of the candles.
  • πŸ“Š OBD-II scanner - Reading EBU errors (for example, P0301 - omissions in cylinder 1.
How to check the ignition coil with a multimeter?

Measure the resistance of the primary winding (between the terminals "B" and "K") - should be 0.4-2 ohms. Secondary winding (between "B" and high-voltage output) - 6-15 kΞ©. Deviations indicate an interturn circuit or a break.

Services and prevention

To ensure that the ignition system works without failure, follow simple rules:

β˜‘οΈ Prevention of the ignition system

Done: 0 / 5

Pay special attention high-voltage. Their resistance should not exceed 10 kΞ© (checked by a multimeter). Wires with cracks or breakages insulation lead to a leak of current and a weak spark.

⚠️ Warning: When replacing candles or wires, always turn off the battery's minus terminal! Even with the ignition turned off, there may be a residual charge in the coil, which will damage the electronics when short-circuited.

Frequent errors in repairs

Many car owners make common mistakes that exacerbate ignition problems:

  1. Ignoring the error code - discharge Check Engine without diagnosis. For example, a mistake P0351 indicates a malfunction of the coil of the 1st cylinder, and not the "glitch of the ECU".
  2. Savings on candles Installation of cheap candles with an inappropriate potassium number leads to overheating or failure.
  3. Wrong candle gap Too large a gap requires a higher voltage, which accelerates the wear of the coil.
  4. Use of incompatible wires Silicone wires for modern cars can not be put on old cars with a trambler (different resistance).
πŸ’‘

When replacing the ignition coil on a modern car (for example, Hyundai Solaris) be sure to β€œreset” the ECU adaptations through a diagnostic scanner. Otherwise, the control unit will use old calibrations, which will lead to unstable operation of the engine.

Can I drive with a faulty ignition coil?

Technically possible, but highly undesirable. If the coil is pierced, this leads to:

  • Increased load on the remaining coils (they will fail faster).
  • Increase fuel consumption by 10-20%.
  • Risk of damage to the catalyst due to underburned fuel.

On modern cars (for example, Kia Rio 4) prolonged driving with ignition passes may cause the ECU to go into emergency mode with limited speed.

What is the best lighting for gas equipment?

For engines with HBO, it is recommended to reduce the clearance by 0.1-0.2 mm compared to the standard (for example, instead of 1.1 mm, put 0.9 mm). This is because the gas-air mixture is ignite worse than the gasoline, and a smaller gap provides a more reliable spark.

The exception is iridium candles: their gap is usually fixed and does not require adjustment.

Why doesn't it start after the engine is washed?

Most likely, the water got on the elements of the ignition system:

  • In high-voltage wires (insulation breakdown).
  • On the coil or ignition module (short circuit).
  • In the connectors of sensors (for example, the crankshaft sensor).

Solution: Dry the under-hood space with compressed air or a hair dryer, check the chains with a multimeter.

How does an individual coil differ from a general coil?

Individual coils (art.coil-on-plug) are fitted directly to the candle of each cylinder. Their advantages:

  • No high-voltage wires (less energy loss).
  • More accurate spark supply (no mechanical distributor).
  • Easy replacement - when one coil fails, the rest do not suffer.

A common coil (or module) serves multiple cylinders at once, which is cheaper but less reliable.

Can I adjust the angle of advance of the ignition independently?

In trambling vehicles (VAZ-2107, GAZ-24) Yes, with a strobe or "by ear" (turning the trampler body). On injection cars, the angle is adjusted only through the firmware of the ECU or special correctors (for example, Jacket).

Independent adjustment on modern machines is fraught with adaptation failure and transition to emergency mode.