Ford 2.5L (152 cu in) Duratec firing order — diagram & guide

During the past few years, Ford has been re-designing its base engines and switching to new and modern turbocharged EcoBoost options. However, one engine that still there to resembles the past is the four-cylinder 2.5-liter Duratec engine.

So, the Ford 2.5L (152 cu in) firing order is something you’d all want to know, but there are a few issues. There have been other 2.5-liter engines made by Ford, which is why we’ll try to explain how they all all different and list their firing sequences independently.

Ford 2.5L Duratec firing order

To cut straight to the point – the Ford 2.5L Duratec firing order is 1-3-4-2 and it’s the firing order for a four-cylinder engine developed together with Mazda. In fact, it was based on Mazda’s L5 engine and the firing order is pretty much the same.

However, there’s another 2.5-liter Duratec engine and this is the old V6 produced in the late 90s. The cylinder order for the 2.5-liter V6 is 1-4-2-5-3-6. So, it’s crucial to differentiate between the two if you have a 2.5L Duratec engine so you don’t get things mixed up.

Still, you probably won’t as the V6 was produced in the late 90s while the four-cylinder is made as a more recent base engine from 2010. Plus, that four-cylinder engine has two cylinders less which makes it different.

Ford 2.5L cylinder diagram

The order of the cylinders within an engine is quite different from the firing order, so you’ll need to know about this as well. This way you can follow the cylinders in order and look for any signs of misfiring issues. So, for the latest Duratec I4 engine, the cylinder arrangement is 1 to 4 in a straight line.

However, the earlier six-cylinder engine is a V6 so it has two cylinder banks. The first one on the passenger’s side has cylinders 1, 2, and 3, while the second one on the driver’s side has cylinders 4, 5, and 6.

Naturally, it’s from the angle of the front end of the engine towards the rear.

Ford 2.5L vehicle applications

While the old Duratec V6 was only used in the Ford Mondeo offered in Europe, the new 2.5-liter four-cylinder developed together with Mazda was offered in many more models. So, here’s a full list:

• Ford Escape
• Ford Fusion
• Ford Transit

Along with these, the engine was also offered in a few other models of other brands like Lincoln in the MKZ, or Mercury in the Milan Hybrid.

Our take

As it turns out, the 2.5L Duratec engine is difficult to figure out the firing order due to all the different versions of the 2.5-liter powertrain that Ford has developed so far.

So, we hope to have helped you differentiate between these engines and figure out the right firing order and cylinder layout for each.