The Toyota 4S engine is the youngest in the 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.
- 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;
- 4S-FE Gen 1 – an updated model produced with distributor injection, with more power of 115 hp. They were produced from 1989 to 1999.
- 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;
The S family includes engines: 4S‑Fi, 4S‑FE, 3S‑FC, 3S‑FE, 3S‑FSE, 3S‑GE, 3S‑GTE, 5S‑FE.
The 4S-Fi engine was installed on:
- Toyota Camry 2 (V20) in 1986 – 1992;
- Toyota Carina 5 (T170) in 1988 – 1992;
- Toyota Corona 9 (T170) in 1987 – 1992;
- Toyota Mark II 6 (X80) in 1988 – 1992.
The 4S-FE engine was installed on:
- Toyota Caldina 1 (T190) in 1992 – 1995;
- Toyota Camry V30 in 1990 – 1994; Camry V40 in 1994 – 1998;
- Toyota Carina 5 (T170) in 1989 – 1992; Carina 6 (T190) in 1992 – 1996;
- Toyota Corona 9 (T170) in 1989 – 1992; Corona 10 (T190) in 1992 – 1996;
- Toyota Curren 1 (T200) in 1994 – 1998;
- Toyota Mark II 6 (X80) in 1990 – 1995; Mark II 7 (X90) in 1992 – 1996.
Specifications
| Production years | 1986-1992 (4S-Fi) 1989-1999 (4S-FE) |
| Displacement, cc | 1838 |
| Fuel system | single injection (4S-Fi) injector (4S-FE) |
| Power output, hp | 105 – 115 (4S-Fi) 115 – 125 (4S-FE) |
| Torque output, Nm | 150 – 160 (4S-Fi) 155 – 165 (4S-FE) |
| Cylinder block | cast iron R4 |
| Block head | aluminum 16v |
| Cylinder bore, mm | 82.5 |
| Piston stroke, mm | 86 |
| Compression ratio | 9.3 (4S-Fi) 9.3 – 9.5 (4S-FE) |
| Features | DOHC |
| Hydraulic lifters | no |
| Timing drive | belt |
| Phase regulator | no |
| Turbocharging | no |
| Recommended engine oil | 5W-30, 5W-40 |
| Engine oil capacity, liter | 3.9 |
| Fuel type | petrol |
| Euro standards | EURO 1 (4S-Fi) EURO 2 (4S-FE) |
| Fuel consumption, L/100 km (for Toyota Corona 1995) — city — highway — combined |
10.5 6.4 8.0 |
| Engine lifespan, km | ~350 000 |
| Weight, kg | 140 |
Disadvantages of the Toyota 4S engine
- The injection pump has become unusable. The breakdown is accompanied by a leak of gasoline into the crankcase and a breakdown of the connecting rod and piston group. 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.
- Stuck EGR valve system – exhaust 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.
- 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.
- Gasoline burn (sometimes severe). It is necessary to adjust the ignition, clean the nozzles, idle valve and throttle valve.
- Vibration. Malfunctions are caused by loosening of the aggregate pad or stopping of one of the cylinders.
- 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.
