Error 0303 Priora 16 valves causes
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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
Error P0303
Technical description
Cylinder 3 - misfire (ignition)
Cylinder 3 – misfire detected
Symptoms
- check engine light is on or blinking
- uneven engine operation (troit)
- difficult engine starting
Causes
- faulty spark plug
- faulty high voltage wire
- faulty ignition coil
- faulty fuel injector
- faulty oxygen sensor/sensors
- exhaust valve burnt out
- faulty catalytic converter/converters
- lack of fuel
- bad compression
- Engine control module (PCM) is faulty
Repair recommendations
First of all, it is recommended to look at the manual (specialized literature) on the maintenance and repair of your car.
The P0303 code means that the vehicle's computer has detected that one of the engine's cylinders is not working properly. In this case it is cylinder number 3 .
If there are no symptoms, the easiest thing to do is reset the code and see if it comes back.
If the engine runs rough (troubles), check all wires and connectors that lead to cylinder No. 3 (including the spark plugs).
Depending on how long the ignition components have been in the vehicle, it may be a good idea to replace them as part of your regular maintenance schedule.
It is recommended to check the spark plugs and spark plug wires. Next, check the ignition coils.
It is also recommended to measure the compression.
In some cases, the catalytic converter fails.
In other cases, the fuel injectors may be faulty.
Source
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