MajorCommonEngine

Nissan Silvia: SR20DET NVCS Oil Control Valve Blockage

SR20DET NVCS Oil Control Valve Blockage is a common engine fault on the Nissan Silvia on the 1991–2002 cars, and we rate it major. Putting it right costs $200 to $600 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 10 documented faults on the Nissan Silvia.

Vehicle: Nissan Silvia
Only on: BMW M
Engine: SR20-DET
Years: 1991–2002
Fuel: petrol
Gearbox: manual
System: Engine

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

All Nissan Silvia faults10 documented faults on this model

What you are looking at

No photograph available

We do not hold a verified photograph for this fault yet. We would rather show none than show a picture of something else.

What goes wrong

S14 and S15 SR20DET engines use Nissan Variable Cam System (NVCS) to advance the intake camshaft at higher RPM. The oil control solenoid (OCV) that actuates this system blocks with sludge when oil maintenance is poor, causing rough idle, flat mid-range power, and persistent check engine lights. Cleaning or replacing the solenoid restores function; blocked units are common on engines with irregular oil changes.

What you would notice

Rough or lumpy idle, particularly when warm
Flat spot in mid-range acceleration
Check engine light — cam position sensor or NVCS circuit codes
Engine hunting at idle

How to check it

Where to look. Intake camshaft end, NVCS solenoid on top of cylinder head (S14/S15)

Scan for ECU fault codes — NVCS-related codes point directly to this fault. With engine warm at idle, disconnect and reconnect the NVCS solenoid connector; idle quality should momentarily change on a functioning unit. Inspect solenoid screen for sludge. Oil sludge inside the rocker cover indicates high-risk engine.

What it costs to put right

$200 to $600 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 NVCS solenoid been cleaned or replaced?”
“What oil grade and interval has been maintained?”
“Are there any stored or active ECU fault codes?”

Now check the Nissan Silvia 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.

Nissan Silvia buyer questions

Is sr20det nvcs oil control valve blockage serious on a Nissan Silvia?

We rate it major and common on the Nissan Silvia. S14 and S15 SR20DET engines use Nissan Variable Cam System (NVCS) to advance the intake camshaft at higher RPM. The oil control solenoid (OCV) that actuates this system blocks with sludge when oil maintenance is poor, causing rough idle, flat mid-range power, and persistent check engine lights. Cleaning or replacing the solenoid restores function; blocked units are common on engines with irregular oil changes.

How much does it cost to fix on a Nissan Silvia?

$200 to $600 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 Nissan Silvia years are affected?

Our research records this fault on the 1991–2002 Nissan Silvia. 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.