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Power loss causes and remedies

Do you notice drops in power sometimes accompanied by exaggerated jolts? Several causes can be the cause of this problem. It also remains to be seen whether your loss of power is directly linked to the damage to a part or whether it is the motor which puts itself in safety (degraded mode which reduces its capacities in order to protect it) after having detected a concern at the level of an element (sensors, turbo, air intake …). If your car works normally after restarting it, it is the electronics that put the car in degraded mode. It is then usually enough to put the car in the suitcase to find out the problems via the fault codes.


It may be necessary to question the flow meter which (to put it simply) allows calculating the proportion of fuel to be sent into the engine. Indeed, that indicates to the computer the mass of air which enters the engine in order to regulate the injection. If it says anything, the computer will not operate the injection optimally: that is to say, send the right proportion of fuel according to the air mass (the goal is to have an air mixture / perfect fuel in the cylinders).


  • EGR Valve

This breakdown has now become a classic. The EGR valve takes care of reinjecting exhaust gases into the engine (to burn particles (this system is strongly criticized by many engineers). The problem is that this valve injects more or less gas according to the engine speed by through a moving part controlled by electronics which. When this part is stuck (due to the seizing of the valve following its fouling) it no longer works correctly and the motor can then go into safety mode by reducing the performance (we also often see the engine warning light coming on).


  • Injectors

If your engine “grazes” at low revs the injectors may be involved. Especially if your vehicle has difficulty starting.

Particle filter

  • Particle Filter

If the latter is clogged, the air passes less well … The result, your blocked exhaust prevents the engine from breathing well (or rather from exhaling …).

Ignition (petrol engines)

  • Ignition

An ignition problem (coil, distributor, etc.) can also logically be the cause. Indeed, if the “explosions” (we say rather the combustion) are not triggered at the right time by the ignition the engine works less well.

The intake circuit.


The air from the turbo passes through an intercooler which is a radiator which cools the intake air and enters the intake pipe via the EGR valve. The symptom is a loss of power at high speed.


A leak in the hoses or the intercooler has the effect of reducing the pressure as well as the air volume in the engine. Often the hoses become porous at the level of the clamp generally this porosity is manifested by the presence of oil on the collar. Wipe the clamps, make a few kilometres if there is the new oil then HS hoses therefore to change. An intercooler which is no longer waterproof is also manifested by the presence of oil, often it is the connection between the metal part and the plastic body that this defect appears. The pressure sensor on the intake pipe causes the same symptoms. In the event of a leak in the intake circuit, the sensor is left with values ​​inconsistent with the charge of the turbo.


The turbo is relatively simple technology in terms of its operation but which is very expensive and which reduces the performance of the car when it no longer works or malfunctions. Since 2000 the turbos have been of variable geometry, that is to say, that a control rotates the fins to increase or decrease the exhaust flow to the turbine. Often the variable geometry can seize up. Loss of power, an abnormally high hiss, lots of cold white smoke are the symptoms of a faulty turbo. As the inspection operation is relatively complex, we advise you to ask your favourite mechanic to carry it out.


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