Poor acceleration 1.2 petrol

Hi folks, posting on behalf of my father in law who isn't good with forums!!
He has owned a 2018 c3 aircross 1.2 petrol for little over a year now, the car has recently been experiencing poor acceleration, if driven very timidly it's fine but the moment you try and overtake on give it any kind of power it will judder and splutter then limp.
He has been looking on YouTube (he's discovered YouTube at the age of 70) and thought he knew how to resolve it by cleaning the MFS with spray.
After an hour of looking yesterday we couldn't seem to find the bleed'n sensor anywhere? I'm begging to think this model doesn't have 1?!
Is this the case?
And if so does anyone have any input as to why the car has suddenly become sluggish and now responsive to a bit of heavy throttle?
We don't have a code reader either sorry.
Thaks in advance!

Nemesis_Inferno wrote: ↑Tue Jun 28, 2022 7:43 am Hi folks, posting on behalf of my father in law who isn't good with forums!!
He has owned a 2018 c3 aircross 1.2 petrol for little over a year now, the car has recently been experiencing poor acceleration, if driven very timidly it's fine but the moment you try and overtake on give it any kind of power it will judder and splutter then limp.
He has been looking on YouTube (he's discovered YouTube at the age of 70) and thought he knew how to resolve it by cleaning the MFS with spray.
After an hour of looking yesterday we couldn't seem to find the bleed'n sensor anywhere? I'm begging to think this model doesn't have 1?!
Is this the case?
And if so does anyone have any input as to why the car has suddenly become sluggish and now responsive to a bit of heavy throttle?
We don't have a code reader either sorry.
Thaks in advance!

Hi

Do you mean the MAF sensor? The petrols don't use them.

Are the plugs and coil pack in good order? Are they due a service?

There are 2 types of sensors that engines use to measure or calculate the amount of air being consumed.
One is a MAF sensor. That stands for Mass Air Flow sensor and is typically in the inlet pipe just after the air cleaner box but before the throttle body. It may be a probe in the pipe or form a part of the inlet pipe. It measures the actual air flow going into the engine.
The other is the MAP sensor. That stands for Manifold Absolute Pressure sensor. That's a probe in the inlet plenum. The plenum is the area behind the throttle body but before the air is split up to go into the cylinders. It forms part if the inlet manifold. It's typically an "empty" chamber. The MAP sensor is used to calculate the air entering the engine by measuring the pressure of the air in the plenum. Negative pressure if the engine is normally aspirated (non turbo charged) and boost (positive pressure) if the engine is turbo charged.
Larger normally aspirated engines (above 1.8L capacity?) tend to use a MAF sensor as the primary air consumption sensor.
Smaller normally aspirated engines (below 1.8L capacity?) tend to use only a MAP sensor.
Turbo charged engines of any capacity tend to use both.

I am not that familiar with the Puretech engines and I'm not sure if you are talking about the turbo or non-turbo version.

I would assume you are talking about the non-turbo version as the turbo version would tend to have both the MAP and MAF sensors and the MAF sensor is easy to spot. In this case the MAP sensor would be on the plenum. It could be on the top or the side of the plenum.