Silvia (S13 / S14 / S15)

1988-2002 / Coupe / Japan

All Silvia (S13 / S14 / S15) problems All workshop issues

Common Engine

Idle Air Control Valve (IACV) Failure

Symptoms

Erratic idle speed, the RPM hunts up and down between 500 and 1,500 rpm. The engine may stall at traffic lights or when coming to a stop.

Cause

The IACV is a stepper motor that controls idle speed by regulating air bypass around the throttle plate. Carbon deposits from PCV blowby clog the valve, and the stepper motor wears with age. Vacuum leaks can also cause hunting idle, so the IACV should be checked after eliminating boost/vacuum leaks.

Fix

Remove the IACV and clean it with carburettor cleaner or throttle body cleaner.

The stepper motor pintle should move freely.

While the IACV is off, clean the idle air passage in the throttle body.

If cleaning does not resolve the issue, replace the IACV: $100-200 for an aftermarket unit, $300+ for genuine Nissan.

Cost: usually free if cleaning works.

Cost mentioned in fix

$100-200 for an$300+ for genuine

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// More Silvia (S13 / S14 / S15) problems

Other known issues

Critical Engine

Timing Chain Stretch and Guide Wear (SR20DET/SR20DE)

Rattling or clattering from the front of the engine, most pronounced on cold start. The noise may diminish when warm but persist at idle. In severe cases, the engine loses power, runs rough, or misfires.

Common Engine

Turbo Oil Seal Failure (SR20DET)

Blue smoke from the exhaust, particularly on boost or on deceleration (overrun). Oil consumption increases. Oil residue visible in the intercooler piping.

Common Engine

Boost Leaks

Sluggish boost response, reduced power, the car feels slow despite the turbo appearing to spool.

Common Engine

Coolant Temperature Sensor Failure

The temperature gauge reads incorrectly (stuck on cold, reads erratically, or pegs to hot without the engine actually overheating). The engine may run rich on cold start or overheat without the fans activating.

Common Drivetrain

2nd Gear Synchro Wear (5-Speed Manual)

Grinding or crunching when shifting into 2nd gear, particularly on quick downshifts from 3rd. May also grind on fast upshifts from 1st. The problem worsens with use.

Common Drivetrain

Clutch Wear and Judder

The clutch slips under hard acceleration (engine revs rise but speed does not increase). Clutch judder (vibration when engaging from a standstill). The bite point moves progressively higher toward the top of the pedal travel.

View all 17 Silvia (S13 / S14 / S15) problems