Bob's Mechanical Repairs

Engine Carbon Clean

Bob's Mechanical Repairs — independent family-run garage in Birnam, Dunkeld, Perthshire. Call 01350 727 276 or email [email protected].

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Restore power and performance, revitalise fuel efficiency and lower emissions. Suitable for petrol, diesel or LPG engines.

Suitable for any petrol, diesel or LPG engine from 500cc to 10,000 litres

Motorbikes – Cars – Vans – Commercial Vehicles – Boats – Farm and Plant Machinery – Power Generators. Engine Carbon Clean available in Birnam, Dunkeld, Blairgowrie, Pitlochry, Blair Atholl, Perth, Perthshire, Bankfoot, Aberfeldy.

Restore Power and Performance

Removing carbon from the engine will allow for restored power and smoother performance, as well as a quieter engine.

Revitalise Fuel Efficiency

Carbon build-up in the engine can dramatically reduce a car's fuel efficiency. The service will help to remove carbon build-up and thereby revitalise fuel efficiency. Most customers experience an improvement in MPG and lower fuel bills.

Lower Emissions

The Engine Carbon Clean service significantly reduces harmful emissions and can also help to achieve MOT emission test levels.

What's included

  • Operates using compressed air
  • Portable & robust industrial design
  • Multi Functional – Cleans fuel injectors, fuel lines, fuel pumps, combustion chambers and throttle body systems
  • Removes all deposits from the fuel system without damaging the engine
  • Includes comprehensive fuel system adaptor kit
  • Improved MPG
  • Improved Power
  • Lower exhaust emissions

What to expect

The carbon cleaning process is non-invasive — there's no need to dismantle any engine components. We connect our specialist equipment to the fuel system and run a cleaning solution through the engine at controlled temperature and pressure. You'll typically notice smoother running and improved throttle response immediately afterwards. We also take emissions readings before and after to demonstrate the improvement.

Frequently asked questions

How often should I have a carbon clean?

We recommend a carbon clean every 20,000–30,000 miles, or annually if you mainly drive short journeys. Urban and stop-start driving causes carbon to accumulate faster than motorway miles. Regular cleaning keeps your engine running efficiently and can prevent expensive component failures.

Will a carbon clean help my car pass its MOT?

It can. If your vehicle is borderline on emissions — a common issue with older diesels — a carbon clean can reduce exhaust gases enough to bring readings within the MOT pass threshold. We often recommend it as a first step before more invasive repairs.

Is a carbon clean suitable for newer cars?

Absolutely. Even modern engines with low mileage can develop carbon deposits, particularly around the intake valves on direct-injection petrol engines. Cleaning helps maintain the performance and fuel economy your car had when it left the factory.

How long does the carbon cleaning process take?

The full treatment typically takes around 45 minutes to an hour. We connect our equipment to the fuel system, run the cleaning agent through the engine, and then check emissions before and after to confirm the improvement. No dismantling is required.

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