1.5 TSI ENGINE AND THE FAMOUS "Jerky" ENGINE: WHAT YOU REALLY NEED TO KNOW

Introduction to the 1.5 TSI engine

The Volkswagen Group's 1.5 TSI EVO engine , introduced in 2017, represents one of the most advanced solutions in the field of small-displacement turbocharged petrol engines. Used in models such as the Volkswagen Golf, Tiguan, Passat, Skoda Octavia, Seat Leon and Audi A3, it replaced the previous 1.4 TSI, aiming for greater efficiency thanks also to the introduction of the ACT (Active Cylinder Management) system, which deactivates two of the four cylinders under partial load conditions.

However, despite the engineering intentions, many motorists and mechanics have noticed an abnormal behavior in some driving conditions: jerkiness at low revs , also known as the kangaroo effect .

What is the "kangaroo effect" in the 1.5 TSI?

The term "kangaroo effect" describes an erratic, jerky engine response, felt most often:

• In standing starts

• When releasing and re-igniting the accelerator below 2,000 rpm

• In urban driving contexts , with frequent stop & go

This problem results in a rough and sometimes annoying ride, especially for those who use the car in the city or in traffic.

Why does it happen? The technical causes

The main causes of the problem are linked to a combination of mechanical and electronic factors :

• ACT system : cylinder deactivation, although effective in reducing fuel consumption, creates a change in engine behavior.

• ECU mapping : Some ECU software versions do not handle the transition between 2 and 4 cylinders optimally, resulting in delays in accelerator response.

• Variable geometry turbocharger : May cause a delay in initial boost at low revs.

• DSG gearbox (where present): the behaviour of the dual-clutch automatic gearbox can also amplify the problem, especially in low gear.

Volkswagen Software Updates

Volkswagen has released several software updates over the years, aimed at improving ECU mapping and better managing cylinder deactivation. In many cases:

• The problem has eased , but

• It has not been fully resolved , especially in some vintages (2018-2020)

Authorized mechanics can update the ECU for free if the car is still under warranty. Some users have also opted for custom remaps , but be careful: they could void the warranty.

Practical advice for those driving a 1.5 TSI

If you own a vehicle with a 1.5 TSI engine and experience jerkiness:

• Check with an official support center to see if any software updates are available.

• Avoid sudden maneuvers at low revs, trying to keep the revs above 2,000/min at the start.

• Consider using premium fuels , which can improve combustion and engine response.

• In extreme cases, you may want to consider a remap optimized by specialists , as long as you are aware of the risks.

The mechanics' point of view

Many independent mechanics and auto parts dealers have encountered this phenomenon during road tests and report it as a minor design flaw, not dangerous , but annoying to the average user.

In the context of expert workshops and spare parts dealers, such as Autoricambi Tritella , it is possible to deal with staff who have in-depth knowledge of the characteristics of the 1.5 TSI and can suggest suitable solutions, including any modifications or updates.

Conclusion

The 1.5 TSI engine offers an excellent balance between performance and fuel economy, but its notorious "jerkiness" is a real limitation for those who drive in urban environments. Staying up-to-date, consulting industry professionals, and driving consciously can make all the difference.

FAQ

Which cars have the 1.5 TSI engine? Volkswagen Golf, Passat, Tiguan, T-Roc, Skoda Octavia, Karoq, Seat Leon, Ateca, Audi A3.

Is the "jerkiness" present on all versions of the 1.5 TSI? It's most noticeable on models from 2018 to 2020, but it can also occur mildly on more recent versions.

Can the problem be completely eliminated? With software updates and a suitable driving style, it can be significantly reduced. In some cases, a custom mapping can be used to resolve the issue.

Where can I buy spare parts for my 1.5 TSI? Autoricambi Tritella specializes in selling quality auto parts with fast delivery.