Fuel Injector Car Parts Guide

diesel injector

Fuel injector part for a car

When you are looking to buy a fuel injector to replace your old one it is important to match up the part numbers to be sure it’s the correct one for your car. Get it right the first time – You do not want to purchase the wrong one and then go though the process of finding the correct one all over again.

At Your Car Spares Ltd  – What we test and look for!!!!

In order for us to test the injectors we need to start the engine. If we can’t start the engine then we wont risk keeping the injectors, but if we can then we need to look out for a few things. The first thing we look for is that the engine isn’t misfiring. A misfiring engine can mean a number of faults with an injector such as it’s dirty , clogged or it’s not opening. If an injector is dirty it can also result in an inconsistent fuel supply and this means your engine may rev high and low and your revolutions per minute (RPM) gauge may fluctuate. Another symptom of a dirty injector is uneven engine idling. If your car engine is started but not moving (for example at a red light) then it’s idling , it should be smooth but a dirty injector can cause it to be quite rough.  If you can smell fuel from the engine bay then your injectors could be leaking or they’re not closing. You can also test the injectors using a multi-meter. In order to do this you need to know the resistance level of the injector , and this will be measured in ohm’s.

Where to find the Fuel Injector Parts Number

The location of the part number is dependent on the brand of the injector and the fuel type (petrol/diesel). The majority of diesel injectors are made by Bosch and the part number is usually found on the pin connector unit above the O ring , however on some injectors they will be on the main body. Petrol injectors tend to have part numbers stamped on the side of them. Below we will show you some examples.

fuel injector

Where to find the fuel injector parts number for a diesel vehicle

Close up of the fuel serial code

Close up sample serial number

Another view of the parts number location for a fuel injector car part

Another view of the parts number location for a fuel injector part for a petrol fueled car

Close up of the petrol fuel injector part serial

Close up of the petrol fuel injector part serial

How does a fuel injector work?

Injectors are used to spray fuel into the engine but there is a difference in how a petrol injector works and how a diesel injector works.

Petrol fuel injectors are electro-mechanical devices that’s controlled by the engine control unit (ECU). The role of the injector is to spray petrol into the inlet / intake manifold upon request from  ECU. The nozzle on the injectors sprays the fuel like a fine mist so it can mix with the air before entering the combustion chamber. This system is called indirect fuel injection and it’s used on all petrol engine however there may be some variations for other petrol engines.

Diesel injectors work similarly to the petrol injectors but instead of spraying fuel into the manifold it sprays it directly into the air filled cylinder. There are other systems that spray the fuel into a pre-combustion chamber which is connected through a passage to the cylinder head. The air is heated by the compression so when the fuel is injected it self-ignites.

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