What happens to the engine when you drive at low rpm

Aristotle said it so many years ago… Virtue lies in the middle! Going over is not good, just like not arriving. And we can extrapolate this to the engine and our way of driving in search of fuel economy, a search that has now been accentuated by the high price of fuel.


We leave you the three damages to the engine for driving at low revolutions, pay attention if you want to extend the life of your car!


Do you want to reduce the consumption of your car ? Drive in the highest gear you can. Surely you have heard this phrase more than once, right? And it is well known that if you rev ??the engine too much, consumption will increase, but if you always drive with a minimum rev margin, you will force the machine and end up paying dearly. And you can end up destroying the engine.


The price of gasoline has skyrocketed. Today gasoline is paid at an average of 1.57 euros per liter, referring to the Sin Plomo 95. Diesel is close to 1.50 euros per liter, with 1.46 euros.

Will we reach two euros? If the rise continues, any scenario is possible, and in this context saving fuel is mandatory. But beware of wanting to do it only driving at low revolutions.

One of the dangers that lurks when we drive constantly at low revolutions is the breakdown of the EGR valve. You know what we mean, right?

This system is responsible for the recirculation of gases, allowing part of the exhaust gases to return to the intake to carry out combustion with less oxygen that thus produces less nitrogen oxide. With this, we manage to expel a smaller amount of polluting gases at the cost of reintroducing them into the engine.

The problem comes when we drive constantly at low revs, at which point the valve stays open. If this system is open, recirculation will take place, and taking into account that combustion in these circumstances is not at such high temperatures, a greater amount of soot is produced.

And unfortunately, this soot will build up and build up until it completely collapses the circuit. A wreck!

And the EGR valve is not the only one that can be damaged. No, your problems have not ended here. The particle filter is a system made up of a porous ceramic honeycomb and equipped with numerous ducts that trap the particles emitted by the engine, seeking to drastically reduce the harmful gases that our car expels.

It is placed in the exhaust system, sometimes forming part of a single piece together with the catalytic converter. Broadly speaking, the FAP’s job is to trap the particles and burn them to regenerate and eliminate them.

When we have generated a large quantity, they end up accumulating, and if the FAP does not reach the optimal temperature for its work, it will end up clogged. The system will detect it and will carry out more regenerations, increasing consumption and putting the system at risk, which could permanently break down.

In the same way, and apart from the systems that aim to lower emissions and transform harmful gases, low engine speeds cause significant vibrations.

Vibrations are negative for the engine, as they cause premature wear and malfunctions in elements such as cylinders. And not only in them, different components can be affected if the vibrations are maintained over time. Take note!

This article was published in Autobild by Enrique León.