Modern common-rail diesels are efficient and strong, but their fuel systems work at very high pressures with tight tolerances. Contaminated fuel, water in the system or an overdue fuel filter can damage injectors and pumps. Many bakkies, SUVs and vans on Johannesburg roads are diesel, and these faults are among the most common we see.
Injectors and pumps are expensive, so diagnosis matters. We test before we replace anything.
Symptoms
- Hard starting, especially when cold
- Black or white smoke
- Rough idle or knocking
- Loss of power or limp mode
- Higher fuel consumption
- Diesel smell or leaks around the engine
How we approach it
- Diagnostic scan and live fuel-pressure data
- Injector balance and leak-back testing
- Fuel filter and water separator checks
- Fuel quality checks
- Repair or replacement of injectors and pumps, quoted for your approval
Prevention
Replace the diesel fuel filter at the interval your manufacturer specifies, drain the water separator if your vehicle has one, and fill up at busy stations. A fuel filter costs far less than an injector.
Common questions
Can injectors be repaired or must they be replaced?
It depends on the injector and the fault. We test them and give you the options.
What causes black smoke?
Too much fuel or too little air: injectors, air filters, turbo or sensor faults are common causes.
Does bad fuel really damage injectors?
Yes. Water and dirt can damage high-pressure parts quickly.
Do you work on diesel bakkies?
Yes, diesel cars, bakkies, SUVs and vans of all makes.
