MajorCommonEngine

Toyota GR86: FA24D GDI Intake Valve Carbon Buildup

FA24D GDI Intake Valve Carbon Buildup is a common engine fault on the Toyota GR86 on the 2021 onward cars, and we rate it major. Putting it right costs $800 to $1,800 at New Zealand independent workshop rates. Below is what goes wrong, the symptoms to notice on a test drive, where to look, and what to ask the seller before you hand over any money. It is one of 22 documented faults on the Toyota GR86.

Vehicle: Toyota GR86
Engine: 2.4L
Years: 2021 onward
Fuel: petrol
System: Engine

This page covers the Toyota GR86 as a model. Some faults only affect particular engines or build years — enter a plate below to narrow the list to one car.

All Toyota GR86 faults22 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph of the PCV / oil separator yet. We would rather show none than show a picture of a different part.

What goes wrong

The FA24D 2.4-litre engine in the GR86 uses gasoline direct injection without supplementary port injection, so fuel does not wash the intake valves during normal operation. Oil vapour recirculated through the positive crankcase ventilation system deposits as carbon on intake valve stems, faces, and seats over time. As deposits accumulate they restrict airflow into cylinders, causing progressively rough cold starts, hesitation under light throttle, misfires at low RPM, and measurable power loss. This is an inherent design characteristic of GDI engines and becomes functionally significant from around 60,000 to 80,000 km without proactive cleaning. The same engine is used in the Subaru BRZ ZD8 and exhibits identical behaviour.

What you would notice

Rough or lumpy idle particularly when cold
Hesitation or stumbling under light to moderate acceleration
Engine misfires at low RPM, especially below 2,500 RPM
Increased fuel consumption without change in driving pattern
Hard starting on cold mornings

How to check it

Where to look. FA24D engine intake valves and intake ports, cylinder head intake side

Conduct a cold-start test drive and check for hesitation during the first few minutes of operation. Review ECU history for stored misfire codes on any cylinder. Ask for service history showing any record of intake valve walnut blasting or chemical induction cleaning. Cars above 60,000 km with no cleaning history should be priced accordingly. If a workshop inspection is possible: Use a borescope inserted through the intake manifold to visually inspect intake valve stems and faces for black carbon deposits.

Parts involved: PCV / oil separator.

What it costs to put right

$800 to $1,800 at New Zealand independent workshop rates. That is for this job on its own, not for the car.

An estimate, in NZD, for the repair as normally carried out. What a specific car costs depends on which part has failed and what it damaged on the way — treat this as the floor for a negotiation, not a quote.

Ask the seller

“Has the intake ever been cleaned, walnut blasted, or chemically inducted?”
“How many kilometres has the car covered?”
“Has there been any rough idle, cold-start hesitation, or misfire?”
“Are there any stored fault codes in the ECU, particularly misfire codes?”

Now check the Toyota GR86 you are actually looking at

Everything above is true of the model, and it is free. What it does not tell you is whether THIS car has been looked after: its odometer history and whether the reading has ever gone backwards, whether there is still money owing on it, whether it has been reported stolen, how many owners it has had and what it is really worth today. That comes from the official records for that plate. Enter the plate for the free details, or get the full history and a market valuation from $13.49.

Not sure what you would be paying for? See what a full KickTyres check includes.

Where this comes from

The failure described above is documented in published sources — owner forums, technical service bulletins, recall notices and workshop write-ups — held in our fault database. The inspection instructions and the cost estimate are KickTyres’ own interpretation of them, and it is a starting point for an inspection rather than a manufacturer statement.

Toyota GR86 buyer questions

Is fa24d gdi intake valve carbon buildup serious on a Toyota GR86?

We rate it major and common on the Toyota GR86. The FA24D 2.4-litre engine in the GR86 uses gasoline direct injection without supplementary port injection, so fuel does not wash the intake valves during normal operation. Oil vapour recirculated through the positive crankcase ventilation system deposits as carbon on intake valve stems, faces, and seats over time. As deposits accumulate they restrict airflow into cylinders, causing progressively rough cold starts, hesitation under light throttle, misfires at low RPM, and measurable power loss. This is an inherent design characteristic of GDI engines and becomes functionally significant from around 60,000 to 80,000 km without proactive cleaning. The same engine is used in the Subaru BRZ ZD8 and exhibits identical behaviour.

How much does it cost to fix on a Toyota GR86?

$800 to $1,800 at New Zealand independent workshop rates. That figure is for this job on its own. A car showing the symptoms on this page is usually worth either walking away from or negotiating down by at least the repair figure.

Which Toyota GR86 years are affected?

Our research records this fault on the 2021 onward Toyota GR86. Build dates move around, especially on imported cars, so treat the range as the years to look hardest at rather than a guarantee either way. The official records tell you the exact build and first registration date for the car in front of you.