Injector blow-by diagnosed on cylinder 1 after customer reported fumes. Broken green injector seal was leaking fuel and was replaced to prevent further engine damage.
This vehicle came into 1Stop Motor Shop in Newtownabbey with the customer reporting strong fumes while driving.
After inspection, we identified injector blow-by on cylinder 1, caused by a failed green injector seal. The seal had broken down and was allowing both combustion gases and fuel to escape.
Fuel leakage around an injector is a serious issue and requires immediate attention.
The fault was traced to the Number 1 injector seal, which had failed and was no longer sealing correctly against the cylinder head.
Broken green injector seal
Fuel leaking around injector base
Combustion gases escaping
Carbon build-up forming around injector seat
Fumes noticeable while driving
Left unresolved, this can damage the injector seat and cylinder head.
Injector seals are small components, but they perform a critical function.
Engine bay fuel leakage
Carbon contamination around injector
Injector seizure in cylinder head
Damage to injector seat
Increased repair costs
Potential MOT failure
Fuel leaks also present a safety concern.
If you’re in Newtownabbey, Belfast or surrounding areas, common warning signs include:
Strong fuel or exhaust fumes
Ticking or chuffing noise from engine
Visible wetness around injector
Black carbon build-up
Reduced engine performance
If you notice these symptoms, it’s important to have the vehicle inspected promptly.
Once the failed seal was confirmed, repairs were carried out carefully to avoid further damage.
Number 1 injector removed
Carbon cleaned from injector seat
New injector sealing washer installed
Injector refitted and torqued to specification
Engine checked for leaks
The fuel leak was eliminated and the fumes resolved.
Injector blow-by repairs require proper procedures and precision.
Experienced diesel diagnostics
Correct injector seat cleaning process
Accurate torque procedures
Honest fault identification
Trusted Newtownabbey garage
Small seals can cause big problems if left too long. Contact one of our trusted mechanics today:
1Stop Motor Shop – Newtownabbey, serving:
Belfast, Mallusk, Glengormley, Jordanstown, Whiteabbey, Carnmoney, Mossley, Monkstown & Ballyrobert.
