Swirl flap removal

Swirl flaps sit in the inlet manifold and close at low engine speed to increase air
velocity and improve low down combustion. They open again as the revs rise.

They collect soot and carbon, especially on a diesel with a working EGR, and they
eventually stick or seize. On some early engines the flaps could break up and go through
the engine, which is where the reputation came from. Later designs are far better.

The normal repair is to clean or replace the inlet assembly and address the EGR side
that is filling it with soot in the first place.

What we would rather do first

Most of the cars that arrive asking for removal do not need it. They need the
underlying fault finding and fixing, and the system putting back into a working
state. That is diagnostics, and it is a real service rather than a way of hiding a
warning light.

We have the diagnostic equipment and the rolling road to prove a repair worked
rather than assume it did. If a repair is not viable and the vehicle is genuinely
off road, export or competition, we will talk about the alternative.

For the trade

This is one of the jobs available through our dealer file service. Send the
original read, tell us the vehicle and what you need, and the file comes back
checked. If a job carries mechanical conditions on the car, they are listed in the
coverage table below and they apply to your customer’s vehicle too.

More about becoming a JFA tuning dealer