Common faults below

Suzuki Engine Carbon Cleaning

What we see most on Suzuki engines, what causes it, and which clean fixes it. Every job starts with a scan and a quote at our Kings Park workshop.

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Which Suzuki do you have?

Suzuki is almost entirely a petrol brand in Australia, so for most owners this page is a short read.

If you have a Boosterjet — the 1.0 or 1.4 turbo in the Swift, Vitara, S-Cross or Ignis — it is a direct-injection engine, so fuel goes into the cylinder and never washes the intake valves. Suzuki’s crankcase ventilation is better than most, so these build deposits more slowly than a lot of direct-injection engines, but slowly is not never.

If you have a Vitara or Swift with the 48-volt system, the petrol engine is helped along and switched off more often, so it works less hard and stays cooler.

And Suzuki did sell diesel here — the Grand Vitara DDiS from 2008 with the 1.9-litre turbo diesel, and a Vitara diesel from 2016. If you have one it has a particulate filter and an EGR circuit, and both are now old enough to matter.

Common Suzuki carbon problems

What we see

If you drive a petrol Suzuki

Petrol

Intake Valve Carbon on the Boosterjet

The Boosterjet engines inject petrol straight into the cylinder, so nothing washes across the back of the intake valves.
Oil vapour from the crankcase breather settles on the hot valve and bakes into a crust.
Suzuki’s breather arrangement keeps less oil vapour in circulation than many rivals, which slows the process down without stopping it.

A lumpy idle that is worst in the first minute from cold.
Hesitation off the line — noticeable on a small turbo engine.
Misfire codes (P0300–P0304) with no ignition fault found.
Fuel economy slipping on the same commute.

Walnut blasting once the deposits have hardened — the intake comes off and each port is cleaned mechanically.
Because these build up more slowly, a hydrogen carbon clean at sensible intervals often keeps a Suzuki out of the walnut blasting bracket altogether.

Fixed by

Walnut Blasting

Quoted after the free scan

See the service →

If you drive a diesel Suzuki

Diesel

Particulate Filter on the Diesel Vitara

A regeneration needs a sustained run to burn the soot out, and these are small SUVs mostly used for short trips.
Every interrupted regeneration leaves the filter fuller than before.
At their age the injectors are usually contributing as well, loading the filter faster than driving alone would.

DPF warning followed by reduced power.
Warnings arriving closer together.
A hot smell after parking and worse fuel economy.
Codes in the P2002 and P2452–P2463 range.

Where we can, we clean the filter on the vehicle — nothing removed, cut open or replaced. If it has to come off, it gets a three-stage clean and new gaskets, quoted first.
On a car of this age we look at the fuel side in the same visit, because that is usually what has loaded it.
Nothing is deleted. A vehicle without its emissions equipment is not roadworthy in New South Wales.

Fixed by

DPF Cleaning

From $715

See the service →

Diesel

EGR and Intake Soot on the Diesel

The EGR valve feeds sooty exhaust gas back into the intake, where it meets oil mist from the breather.
Years of short trips leave a greasy deposit narrowing the intake runners.
On a four-wheel drive used at low speed the deposit never gets hot enough to burn off.

A small engine feeling strangled, most obvious on a hill or with the car loaded.
Visible smoke when you accelerate hard.
An uneven idle with EGR flow codes stored (P0401, P0402).

We clean the EGR circuit and the intake manifold so the airway is clear again.
On an older Grand Vitara this is often the cheapest thing that makes a real difference.

Fixed by

EGR & Intake Manifold Cleaning

Quoted after the free scan

See the service →

If you drive a hybrid Suzuki

Hybrid

The 48-Volt Hybrids

In the Vitara and Swift hybrids the starter-generator assists the petrol engine and shuts it down more often.
The engine works less hard and spends more time below the temperature that keeps it clean.
Soft carbon builds up quietly, and the better the fuel economy looks the less reason there is to suspect it.

Roughness as the engine restarts.
The engine sounding busier than the speed suggests.
A car that has lost a little of its sharpness with nothing stored on a scan.

A hydrogen carbon clean suits this — nothing comes apart, and it deals with soft carbon before it sets.
On a small engine this is cheap prevention and worth doing on a schedule.

Fixed by

Hydrogen Carbon Clean

$275

See the service →

Applies to any Suzuki

Any Suzuki

A Small Engine Doing Only Short Trips

A Swift or Ignis used for a few kilometres at a time never gets properly warm, and a small engine has little margin before that shows.
The intake side, the fuel side and the exhaust side get dirty together on that duty cycle.
Because these are inexpensive cars, the symptoms tend to get lived with rather than looked at.

A car that feels flat and strained compared with how it drove when newer.
Idle that varies from one cold start to the next.
Nothing stored on a scan to explain any of it.

A full engine carbon clean treats the intake and exhaust sides together, which is the right scope when the whole engine is dirty rather than one part.
On a small car we will be straight with you about whether it is worth the spend before you commit.

Fixed by

Full Engine Carbon Clean

From $715

See the service →

Keeping your Suzuki clean

Prevention

To keep a Suzuki Boosterjet or hybrid clean, clear soft carbon on a schedule, before it hardens. The 1.0 and 1.4 turbo in the Swift, Vitara and S-Cross inject petrol straight into the cylinder, so nothing washes the intake valves. A hydrogen carbon clean at sensible intervals can keep a Boosterjet out of walnut blasting. The diesel Vitara and Grand Vitara load a particulate filter instead.

If your Boosterjet idles lumpy from cold, or the diesel shows a DPF warning light, book a time at our Kings Park workshop. We scan it free first, tell you what it needs, and quote before any work starts. Once the crust has hardened on a petrol, that may be walnut blasting. On the diesel, it may be an on-car DPF clean.

I am very pleased with the service I was provided. Nasir is knowledgeable professional and honest , the diagnostic was accurate, he kept me fully informed and after carbon cleaning and fixing other mechanical issues my car no longer has lumpy idle and throttle response is so much sharper. Overall extremely happy. Highly recommended.

Matthew · Google review

Before any engine work on your Suzuki, search your VIN on the government vehicle recalls site. Recall repairs are free, so check there first.

Get a flat Swift looked at, not lived with. A small engine has little margin, and short trips dirty the intake, fuel and exhaust sides together. We’ll tell you straight whether a clean is worth the spend.
Don’t read good fuel economy as a clean engine. In the Vitara and Swift hybrids, the engine shuts down often and works less hard. The better the economy looks, the less reason you have to suspect a build-up.
Give the diesel work above crawling pace. On a four-wheel drive used at low speed, the intake never gets hot enough to burn its deposit off. Short trips also cut the self-clean (DPF burn) short, so Nas recommends a steady run of about half an hour every week, or an hour every fortnight.
Keep up the servicing. Oil changes at the interval in your handbook keep oil vapour from feeding intake deposits.

Book your Suzuki in

Get a free quote

Tell us the model, the kilometres and what it is doing. We will scan it and tell you which clean it needs, and what it costs, before any work starts.

Get a Free Quote Call Nas — 0455 455 644