Engine Toyota 4S under the hood

Engine Toyota 4S

The Toyota 4S engine is the youngest in the late S-series line, the other two are the 2.0L 3S and the 2.2L 5S. The motor replaced the old 1.8l 1S and is an absolutely exact copy of the 3S motor, the difference lies in the reduced cylinder diameter (from 86 mm to 82.5 mm), intake and exhaust manifolds.

  1. 4S-Fi is the first single-injection variant with a compression ratio of 9.3 and an engine power of 105 hp. Such models were produced until 1991;
  2. 4S-FE Gen 1 – an updated model produced with distributor injection, with more power of 115 hp. They were produced from 1989 to 1999.
  3. 4S-FE Gen 2 – Introduced since 1995 and features increased power of 125 hp and a compression ratio of 9.5.

The 4S-FE engine has the following design features:

  • four cylinders are machined in the cast iron body of the block, the surface is hardened by honing, the arrangement is in-line;
  • The cooling jacket is made inside the block when it is cast;
  • it is recommended to use 5W30 and 10W30 viscosity engine oil;
  • distribution of the fuel mixture by two DOHC camshafts;
  • presence of MPFi system for multi-point injection;
  • DIS-2 ignition system without spark distribution;

Specifications

Manufacturer Kamigo Plant
Also called Toyota 4S
Production years 1987-1999
Cylinder block alloy cast iron
Fuel system carburetor/injector
Configuration inline
Number of cylinders 4
Valves per cylinder 4
Piston stroke, mm 86
Cylinder bore, mm 82.5
Compression ratio 9.3
9.5
Displacement, cc 1838
Power output, hp 105/5600
115/5600
125/6000
Torque output, Nm / rpm 149/2800
157/4400
162/4600
Fuel type 95
Euro standards
Weight, kg
Fuel consumption, L/100 km
— city
— highway
— combined
8.2
5.2
6.7
Oil consumption, gr/1000 km up to 1000
Recommended engine oil 5W-30 / 10W-30
Engine oil capacity, liter 4.2
Oil change interval, km 10000
(better 5000)
Normal engine operating temperature, °C 95
Engine lifespan, km
— official information
— real

300+

Frequent problems

    Engine Toyota 4S under the hood

  1. The injection pump has become unusable. The breakdown is accompanied by a leak of gasoline into the crankcase and a breakdown of the ShPG. The main signs are an increase in oil with a characteristic gasoline smell, twitching on the go, uneven work, frequent stops, speed is floating. You just need to replace the injection pump.
  2. Stuck EGR valve system – outlet gas recirculation. The reason is the formation of tar due to poor fuel. Symptoms are interruptions in speed, interruptions in the rhythm of the unit. The valve should be periodically cleaned or muted.
  3. rpm is lost, the engine stalls. Idle problems are treated by flushing the throttle valve module. You also need to clean the intake manifold. The air filter or fuel pump may have broken.
  4. Gasoline burn (sometimes severe). It is necessary to adjust the ignition, clean the nozzles, idle valve and BDZ.
  5. Vibration. Malfunctions are caused by loosening of the aggregate pad or stopping of one of the cylinders.
  6. Motor overheating. The radiator cap is to blame and should be replaced.

With proper care, the 4S is a fully functional and even high-spirited unit. The resource easily exceeds 300 thousand km.

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