If your Yaris idles rough only when warm, do not replace the camshaft . Remove the single 10mm bolt holding the VVT-i oil control valve and extract the tiny mesh filter. You will find it clogged with sludge. Clean it with brake cleaner. This is a 15-minute fix that dealerships charge $1,200 to misdiagnose as a timing chain issue. 1.2 The Hidden Oil Drain Hole in the Intake Manifold Here is a secret not found in generic manuals. The 2SZ-FE’s intake manifold has a low point designed to collect oil mist from the PCV (Positive Crankcase Ventilation) system. Over time, this collects into a small puddle. When you accelerate hard, the engine sucks this oil in, causing a massive blue smoke screen from the exhaust.

If you own a Toyota Yaris (specifically the XP90 generation produced between 2005 and 2011), you have likely heard a whispered legend in online forums and mechanic garages. That legend is the 2SZ-FE engine . While the 1.0-litre 1KR-FE and the 1.5-litre 1NZ-FE get most of the spotlight, the 1.3-litre 2SZ-FE is the unsung hero of economy and reliability.

But there is a problem. Finding a comprehensive, accurate, and exclusive manual for this specific powerplant is like hunting for a golden ticket. Generic repair manuals cover the chassis, but they often gloss over the unique quirks of the 2SZ-FE.

Disclaimer: This guide is for informational purposes. Always consult a professional mechanic for major engine disassembly. Vehicle specifications may vary by region and model year.