1zr-fe Engine Problems

[Calfu Baransky]

Asthe title indicates there is leak that seems to be the engine oil from the driver side(right side) of the engine. what can it be?? attached are the images (from the above right-side angle) for reference..

May be the oil sink hit something and there is a small leak. Best way is to get the a good wash and see it over night. This happened to my car once and we were unable to locate the leak. It was the inside engine seal which has a small leak.

b) Earlier had experience of oil leak around gear box. (However it was a Suzuki)

Although symptoms were similar, and leak source was a mystery.

Mechanic used bright light to identify source oil 'spill' : turned out to be plastic cover, near top of gear box (locally called 'tickly'). Long time to fix it, but not costly. (once again, that was a suzuki, not 1zr-fe)

Some initial versions of the 1ZR-FE were affected with oil leaks, malfunctioning water pump and high fuel consumption at low mileage. Although rare, these problems have been reported in 1.6L Corollas in G.C.C countries and Russia as well. You're advised to immediately contact your Toyota dealership and have this problem fixed under warranty without delay!

The 2ZR-FE engine took a middle place in the power range of the ZR family, between the 1ZR and 3ZR engines. This 1.8-liter four-cylinder gasoline engine was introduced in 2007 and rapidly became an alternative for the 1ZZ-FE power unit. Toyota produces some different variants of the 2ZR depending on vehicle models (for example, regular Toyota Corolla or hybrid Toyota Prius) and markets (Europe, Japan, North America and etc.).

The base 2ZR-FE has an aluminum cylinder block with spiny-type cast iron liners, steel connecting rods and lightweight pistons with resin-coated skirts. Pistons are cooled by engine oil sprayed on the bottom of pistons by oil jets mounted inside the engine block. An aluminum 16-valve cylinder head is mounted on top of the block with a triple-layer metal type cylinder head gasket in-between. The engine is equipped with a timing chain and two overhead camshafts. Valves are actuated by roller rocker arms. The valvetrain includes hydraulic lash adjusters for a constant zero valve clearance. Intake valve diameter is 31.9 mm; exhaust valve diameter is 27.4 mm. The 2ZR engine has variable intake and exhaust timing - Dual VVT-I system. Camshaft specifications (intake/exhaust): duration is 246/234 degrees; valve lift is 9.9/9.7 mm.

The engine got a plastic intake manifold, electronically controlled throttle body, and Toyota's ETCS-I (Electronic Throttle Control System - intelligent). The 2ZR-FE engine has a sequential fuel injection system, which equipped with 12-hole injectors. Also, this engine received a modern electronic ignition (DIS) with coil-on-plugs. Spark plugs are iridium-tipped thin-electrode type. The exhaust manifold is made from stainless steel.

The 2ZR-FAE version (2009 - present) replaced the 1ZZ-FED entirely and also the base 2ZR-FE engine in some vehicles. The 2zr-fae features the Valvematic system and increased compression ratio. The Valvematic system constantly adjusts an intake valve lift and improves fuel efficiency. With Dual VVT-I and Valvamatic system, this 2ZR version consumes 5-10% less fuel than the 2ZR-FE and produce slightly more power.

The 2ZR-FXE (2010 - present) is another modification of the 2ZR-FE engine, used mostly in Toyota's hybrid models such as Toyota Prius, C-HR hybrid, Lexus CT200h. This engine features Atkinson cycle operation, VVT-i for the intake camshaft only, 13.0:1 compression ratio, and cooled exhaust gas recirculation (EGR) system. The 2ZR-FXE replaced the 1.5-liter 1NZ-FXE engine, previously used in the Toyota XW30 Prius.

2ZR engine problems are the same as for the 3ZR engine series. Among them are progressive oil consumption, unreliable cooling pump, Valvematic issues, and noisy operation. You can read about these and other problems here in the 3ZR engine review.

We shall provide a guide to 1ZR tuning and provide tips on the optimum upgrades. Toyota 1ZR engine are popular tuning projects and with a few sensible modifications like a remap, increase displacement and camshafts you will substantially enhance your driving pleasure.

The 1ZR is not going to give massive gains when tuned being a naturally aspirated engine designed for economy and reliability, but let's look at what mods are possible and which ones are most likely to give you the biggest gains for your money.

The camshaft profile plays a big part in the engines power output so camshaft upgrades make quite a large difference. The intake & exhaust durations will alter depending on the chosen camshaft profile, so large bhp gains are on offer for camshaft upgrades.

A Race camshaft won't do well if on the daily commute, because the lumpy idle will make the car prone to stall and smooth driving at low rpm becomes impossible. If you are developing a track car this doesn't matter as you are in the high end of your RPM range anyway and that is where you want the power to be.

Longer valve durations can alter the bhp band and on most engines the exhaust and intake durations do not need to match, although most cams and tuners use matched pairs there are some advantages to extending the intake or exhaust durations.

(In some cases, as with many Toyotas, the factory ECU is locked flashing is not an option, so an aftermarket ECU is the route to take, and many of these will outperform factory ECU's but make sure it has knock protection and that you get it setup properly.)

Adding a supercharger like they did on the Lotus version of the ZR, or adding a turbo will make large performance gains, although more challenging to install. We have this feature on twinchargers if you want to read more.

Do not go with the largest exhaust you can source this will slow up the exhaust flow rate - the best exhausts for power gains are usually between 1.5 to 2.5 inches. It is the shape and material more than the bore size.

Typically exhaust restrictions can be traced to the catalysts installed, so adding a better flowing sports alternative is the answer. This keeps the car road legal and will flow much better due to it's higher internal surface area and design, so has the added benefit of keeping your car road legal. The alternative decat should be considered an off road only mod, as removing a catalyst is illegal in most territories and regions for road registered cars..

The 1ZR engines are generally reliable and solid units, as long as you follow the manufacturers service schedules, and use a good quality oil to ensure longevity. Few problems should happen as long as they are regularly serviced and maintained.

Carbon build up in the head, particularly around the valves which will sap power or create flat spots, this is a larger issue on direct injection engines but should be looked out for on all engines. We have tips on removing carbon build up.

Some of our members have had issues with flat spots or glitches after applying mods and upgrades or tuning, this is not usually related to this engines design, so instead see our article on diagnosing flat spots and problems after tuning which should help you get the bottom of this issue.

Regular oil changes are vital on the 1ZR, especially when tuned and will help extend the life and reliability of the engine. High oil consumption is an issue on higher mileage engines, always use the correct grade of oil or you will be asking for trouble.

If you would like to know more, or just get some friendly advice on Tuning your 1ZR engine please join us in our friendly forum where you can discuss tuning options in more detail with our 1ZR owners. It would also be worth reading our unbiased tuning articles to get a full grasp of the benefits and drawbacks of each modification.

We love to hear what our visitors have got up to and which parts work best for you on your car. Which helps us keep our guides and tips up to date helping others with their modified car projects. Your feedback and comments are used to keep this page up to date, and help improve the accuracy of these 1ZR tuning guides which get regular updates and revisions.

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