Error code P0301 – misfire detected in cylinder 1

1200 rub. for the photo report

We pay for photo reports on car repairs. Earnings from 10,000 rubles/month.
Write:

Error code P0300 indicates a violation of the ignition order , which stands for random multiple misfires of the cylinders ; in English, the diagnostic tool displays: “Random cylinder misfire detection system.” If a misfire is detected in a specific cylinder, then the last digit “P030x” will change to 1, 2, 3, 4 and so on up to 6 or even 12, depending on which particular “pot” the misfire is in. So error P0300 is derived from errors such as P0301, P0302, P0303, P0304. Most often they occur due to a lack of spark, a fuel supply failure or problems with the exhaust gases.

Let's look at the list of possible causes of misfires, why error p0301, error p0302, error p0303, error p0304 or others of this kind appears, the consequences and methods of elimination, in more detail.

Consequences of error P0300

If a misfire occurs in the engine in the exhaust pipe the level of exhaust gas toxicity increases , which, in turn, can also lead to an increase in the temperature in the catalyst, which causes its damage (the honeycombs melt because the temperature exceeds the threshold of 800 °C ). On some cars, in order to reduce the burnout of fuel in the catalytic converter and, consequently, the level of toxicity, the ECM unit monitors the frequency of misfires using crankshaft and camshaft sensors and, in addition, it registers error p0300, signaling a checkengine light can also , in which the gap was discovered. It is worth mentioning that most often, for some reason, the owners of cars such as Lacetti, Matiz, Priora and other injection VAZs, as well as Opel, Nissan, Kia cars, are interested in the reasons for the occurrence of this error.

When does error code P0300 pop up?

Note that error code P0300 is recorded by the control unit only when misfires are detected in several cylinders simultaneously , since a misfire in one of them is recorded after two repetitions in a row, and the rotation speed of the CV is important. At idle, the error is stored in memory after 3.5 minutes of engine operation, and at speeds above 2 thousand - a little more than one minute. threshold for registering a DTC in the ECM memory is more than 3.25% of missed flashes per 1000 revolutions. If misfires are detected only in a certain cylinder, then not error P0300 is generated, but another one, with the serial number of the combustion chamber of the internal combustion engine.

On which cars is this problem most common?

The problem with code P0302 can occur on different machines, but there are always statistics on which brands this error occurs more often. Here is a list of some of them:

• Audi (Audi a4, Audi A5, Audi q3)
• BMW (BMW X3, BMW X5, E46, F10)
• Chery (Chery Fora)
• Chevrolet (Chevrolet Aveo, Cobalt, Cruz, Orlando, Suburban)
• Chrysler (Chrysler 300c)
• Dodge (Dodge Neon, Ram)
• Fiat
• Ford (Ford Kuga, Mondeo, Fiesta, Focus, Fusion, Explorer, F-150)
• Honda (Honda Jazz, SRV, Civic)
• Hyundai (Hyundai Accent, Getz, Santa Fe, Solaris, Sonata, Elantra)
• Infiniti
• Jeep (Jeep Wrangler, Grand Cherokee)
• Kia (Kia Rio, Sid, Sorento, Sportage, Cerato)
• Lexus (Lexus rx300)
• Mazda (Mazda 3, Mazda 6, Mazda BT 50, Mazda cx7, Millenia)
• Mercedes
• Mitsubishi (Mitsubishi ACX, Outlander, Galant, Karizma, Lancer, Pajero, L200)
• Nissan (Nissan Almera, Altima, Qashqai, Tiida)
• Opel (Opel Antara, Astra, Vectra, Zafira, Corsa, Meriva)
• Peugeot
• Pontiac (Pontiac Montana)
• Renault (Renault Duster, Logan, Megan, Sandero, Fluence)
• Skoda (Skoda Octavia, Superb, Fabia)
• Ssangyong (Sangyong Kyron)
• Subaru (Subaru Outback, Impreza, Legacy, Forester)
• Suzuki (Suzuki Liana)
• Toyota (Toyota Venza, Camry, Corolla, Rav4, Highlander)
• Volkswagen (Volkswagen Golf, Jetta, Passat, Polo Sedan, Tiguan)
• Volvo (Volvo s40)
• Vortex (Vortex Tingo)
• VAZ 2110, 2112, 2114, 2115
• Volga Cyber
• Gazelle Business, umz 4216
• Zaz Sens, Chance
• Lada Kalina, Largus, Niva, Priora
• UAZ Patriot

With fault code P0302, you can sometimes encounter other errors. The most common ones are: P0016, P0171, P0175, P0201, P0202, P0300, P0301, P0303, P0304, P0305, P0306, P0357.

Error p0300, p0301, p0302, p0303 and p0304 causes

Unfortunately, the diagnostic tool has not learned to determine the specific cause of the failure and, in this case, misfire in the engine cylinder, but, fortunately, the most likely malfunctions can develop in two directions - either there is nothing to burn , or it is impossible to ignite . Although it is still too early to rejoice at the possible quick search for the cause of error p0300, since it could be:

Cylinder misfires. How to diagnose the cause.

1. In the ignition system

• spark plug failure;
• breakdown of a high-voltage wire;
• faulty ignition coil (or module);
• other reasons related to wiring and connectors in the ignition system.

• In the power system
• poor quality fuel;
• clogged injectors;
• heavily contaminated fuel filter;
• low fuel pressure.

The main reasons why error P0300 occurs

How does a mechanic diagnose a P0301 code?

When diagnosing this error code, a mechanic will do the following:

• Reads all data and error codes stored in the PCM memory using an OBD-II scanner
• Clear error codes from the PCM memory and test drive the vehicle to see if P0301 appears again
• Check the cylinder 1 spark plug wire for wear and damage.
• Check the cylinder 1 spark plug for wear and damage.
• Check the ignition coil for wear and damage
• Check the ignition coil wire for wear and damage.
• If necessary, replace spark plugs, ignition coils, and related wires
• If P0301 appears again after replacing the above components, check the fuel injector and related wires for damage.
• Check the ignition distributor cap and slider (if equipped) for corrosion and damage
• there are other error codes stored in PCM memory along with P0301
• Test drive the vehicle to see if P0301 again
• If P0301 appears again, check compression in cylinder 1
• If P0301 persists, the problem may be a faulty PCM. In this case, the module may need to be replaced or reprogrammed.

Recommendations for checking and troubleshooting

The first thing you should check when misfiring is the explosive wires and ignition coils (module), they often turn out to have broken insulation, a break, or an oily surface. We measure the wires with a multimeter (normal resistance is about 4 - 10 kOhm), in resistance mode, but to check individual ignition coils, you just need to swap places with a known working cylinder and clear the errors again. If the code has changed to the number of another cylinder, then the coil is faulty. The ignition module is more complicated; it needs to be checked with a tester.

Error 0303 Priora 16 valves causes

• To the beginning of the forum
• Forum Rules
• Old design
• FAQ
• Search
• Users

Lada Priora 2170 2007
126 engine, pistons from 124. Bosch ECU 7.9.7. On the on-board vehicle, errors 0300 and 0303 appeared. We swapped the coils for 2-3 pots, and an error about the third pot appeared again. the candles waved in places, again in the third. Why dig guys? Thank you. and greetings from the Samara branch

p.s. Mordovia is covered in snow, let's ask, how's the weather?

Dig into the compression

Pagoda Shvakh, slush snow melted in the southern Urals

check the wiring to the coil

A year ago I encountered something similar. As a result, a leak in the injectors was first detected (along the way I changed the gaskets in the manifold, etc.) and after a while it became clear that the mass air flow sensor was tired.

Therefore, on a cold engine, take carb cleaner and spray it near the ramp and manifold. By the reaction of the engine you will understand what and how.

Check the MAF voltage when the ignition is on, but the engine is not running. The new one will show 0.996. According to various sources, the upper limit is 1.05. But in practice, with this indicator, the motor will still work.

The compression on my 1st cylinder was 1 unit different from the others - that’s where the leaks occurred during suction.

Next, decarbonization, replacement of gaskets and rubber bands, crimping with new clamps and everything became a herringbone.

As for the injectors, I don’t quite understand how they can be modified with a filter and mesh. When I removed my rings to replace them, I put them on the stand purely for fun - they worked well.

Source

Causes of multiple misfires

Signs of misfire: the engine throttles, power decreases, fuel consumption increases. Uneven operation is clearly noticeable on 3, 4, 5-cylinder engines, but on V-shaped 6 and 8-cylinder internal combustion engines, it is more difficult to notice the shutdown of one of the cylinders.

Error codes

Self-diagnosis of a modern injection system is capable of recording misfires and determining which cylinder is the cause of uneven engine operation. Therefore, we recommend starting with diagnosing the current fault codes. When searching for the cause of a breakdown, it is important to understand in which particular engine operating mode the misfire error occurs.

Without ignition, there is no power stroke in the cylinder, which affects the crankshaft rotation speed. The engine ECU receives information from the crankshaft position sensor, so based on the moment of deceleration, the CV can calculate which cylinder is misfiring.

• P0300 – multiple misfires. This means that burning problems are not limited to just one cylinder;
• P03001, P03002, P03003, P03004, P0300n... - misfires in a specific cylinder. Where N is the serial number of the combustion chamber in which the malfunction occurs.

What are these errors?

Codes p0300, p0301 and p0302 indicate failures in the ignition sequence. Their characteristic stands for “random multiple misses in cylinders.” If you use a special device for engine diagnostics, it will display the phrase “Random cylinder misfire detection system.”

Why is an ignition failure dangerous for a car? This question can only be answered after a brief examination of the operation of the engine as a whole. After starting, the engine operates in four-stroke mode:

1. Inlet of the air-fuel mixture.
2. Fuel compression.
3. Ignition (directly at this stage the working stroke occurs).
4. Exhaust gas release.

Accordingly, if there is no ignition in at least one engine cylinder, then the engine begins to “triple”, and the control unit records the omission of one of the mandatory cycles of the power unit. Ignition is the process of igniting the air-fuel mixture, and if the mixture does not ignite, then the cylinder has no power stroke. That is, one of the engine cylinders accelerates much more slowly than the others, which disrupts the entire ignition order as a whole.

In this regard, when the ECU detects such a failure, it immediately sends a signal to the dashboard in the form of error p0300: the yellow “Check Engine” light comes on.

It should be noted that immediately after skipping one of the cylinder operation cycles, the level of toxin concentration in the exhaust gas system increases. And the superheated exhaust gases in the pipe quickly heat up the catalyst unit, which can cause it to undergo deformation (the honeycombs melt at temperatures above 800 degrees Celsius).

Driving a car with multiple misfires is comparable only to walking on one leg. Sooner or later the motor will no longer cope with the load and will fail. Therefore, car owners are strongly recommended to immediately take the necessary measures when an error is displayed.

Diagnostics

Error on display - misfire

An unpleasant situation when a motorist comes to the car, starts it, but cannot move off normally because it begins to twitch. This means that there are problems with the ignition.

Diagnosing a malfunction is quite easy, because the electronic engine control unit immediately recognizes the error.

Before you get into the ECU, you should look to see if the “ Check Engine ” light has come on on the instrument panel. So, this is a signal that errors have appeared in the operation of the main power unit. If the “brains” controller is equipped with a display located on the instrument panel, then the error can be determined immediately.

Symptoms of malfunction

The main driver symptom of P0303 is the MIL (Malfunction Indicator Light) illumination. It is also called Check engine or simply “check light”.

They can also appear as:

1. The “Check engine” warning light on the control panel will light up (the code will be stored in the ECM memory as a malfunction).
2. The engine stalls or has trouble starting.
3. Floating speed, as well as attempts to stall at idle.
4. Jerking/misfire at idle or under load.
5. Poor speed gain.
6. Increased fuel consumption.
7. Reduced engine power.
8. Smell of fuel from the exhaust.

This malfunction is considered serious and must be corrected as soon as possible. Because prolonged driving with a misfire can cause costly damage to the engine and catalytic converters.