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Diesel car wont start after injector replacement

A diesel car will not start after an injector change - under normal conditions when started, it usually takes only one start and takes more than 30 minutes to warm up the engine. Meanwhile, if the diesel engine needs to be done 3 to 5 times before it is turned on, there could be interference.

Diesel car wont start after injector replacement

Please note, diesel engines are cars that often experience problems when starting because they have high thermal efficiency compared to engines that use other fuels.

There are two types of diesel engines on the market, namely:

  • Conventional Diesel uses conventional fuel systems, such as buses and trucks
  • Commonrail Diesel which applies electric injection technology, so that the availability of fuel is easy to control

Diesel engines that are difficult to start when starting, may be experienced by the two types of injection diesel engines above.

But usually, commonrail diesel tends to be prone to problems if not maintained properly.

Causes of Diesel Cars Not Starting After Changing Injectors and How to Fix It

1. Experiencing Low Compression Pressure

Diesel engines can carry out the combustion process without having to cause sparks because the air temperature during compaction is more than the fuel point of diesel.

When the compression pressure drops, the temperature during compaction decreases and makes it harder for the diesel fuel to burn, making it harder for the engine to start. The thing that makes the compression pressure low arises because when the air is compressed, the mass of air in the cylinder chamber decreases.

This condition can occur because the engine has leaks caused by valves that are not closed tightly, worn cylinder walls, worn compression rings, and damaged injector seals. How to fix it, take it to a repair shop for repair

2. There is a problem with the turbocharger

There are already many diesel engines that use turbo technology with special settings (VCDI, VGT, and VNT) which are usually found in diesel-engined SUVs. The goal is to control the air supply so as not to experience overboost and underboost under engine conditions.

Turbo is able to provide assistance to channel air into the engine, thereby creating a more compressed air mass.

If this control system has a problem, it will make the engine performance not optimal. Usually what happens is underboost or reduced air supply because the turbo propeller which functions as a turbo boost pressure regulator is not open. 

3. There is a problem with the incandescent plug

When you want to start a cold diesel engine, glow plugs can provide sufficient heating and spread in the combustion chamber. If the glow plug is faulty, the final temperature at which diesel fuel is injected into the combustion chamber cannot pass the diesel point. The way to fix it is better immediately take it to your subscription repair shop for maintenance.

4. Reduces Fuel Pressure

Diesel engines require fuel pressure to expel diesel fuel from the injectors. The fuel pressure contained in diesel fuel is up to 2000 Kg/cm2.

Basically the working principle of diesel is to open the nozzle on the injector so that high pressure diesel comes out in the form of a thin mist. When the fuel pressure decreases which is usually caused by a malfunction of the injection pump, making the fuel unable to withstand the compaction pressure.

To overcome this difficult diesel engine, it is necessary to check the condition of the fuel whether the volume of fuel is still sufficient. Then check the fuel pressure, whether there is a blockage that has an impact on the availability of fuel to the combustion chamber.