Hello good, problem golf gti IV

Hello, delighted, you will see a problem with the engine of my gi GTI series IV, it is a 125CV without turbo. And a while ago I don't run. It seems that it works normally but stagnates in the 4000Vueltas. I have changed the caudalimetro and it is not, and in the VW diagnostic machine nothing comes out. It may be the potentiometer of the butterfly? If you have found any with that problem and you can help me. thank you

Hello partner, the problem you tell me has enough bad milk to solve it at a distance (and more in an engine that is as fine as that).

In the first place, that car does not carry steel accelerator cable, but system \ "Drive by Wire \" in such a way that the switchboard interprets the accelerator position by means of a double potentiometer in the accelerator and transmits it to an electrical servomotor that operates the motor gas butterfly.

Both one piece and another are \ "armored against unstoppable breakdowns \" by a simpler system than the mechanism of a botijo.

That is, the potentiometers are double and inverse, so that at rest one of them marks 0 ohms and the other infinity, as you accelerate, one goes up and the other low until they are in a fixed value to a certain position (which does not coincide with the center of the route).

On the other hand, the gas butterfly servomotor also has a double and inverse potentiometer that informs exactly the position of the gase butterfly.

When putting the contact, the switchboard detects these resistance and compares them with the memory, when the engine is working, if one of the resistances fucks, the light is immediately turned on and the switchboard enters \ "strategy or recovery \" in this mode of work the switch Lambda ...).

All the best.

Continuing with the previous issue (it is that if I write a letter does not let me post it) I tell you that the problem can be taken in another order of things such as:

air intake not measured by the flowmeter, (more air enters than the switchboard measures and it injects of less), detectable because it tends to stop and give sporadic failures in Lambda probe.

Lack of pressure on the injection ramp, (the same result because it is another way for the lack of feeding).

Catalizer obstructed by aggressive driving in cold or excessive urban use (if the catalyst does not reach the minimum temperature of 300ºC, it is attacked by carbonilla and if it exceeds the 900ºC, the reactive components are burned and carbonilla attacked as the catalytic reaction does not occur).

If your car carries Broadband Lambda before the catalyst and simple probe behind, the fault light is lit as a secondary lambda probe failure or catalyst failure. If this system does not carry (it only carries a Lambda probe) does not turn on breakdown but it does not throw as before.

This is due to the principle of Chaikosky that says that if they put your finger in the ... not giñas and if you do not be hungry and if you are not hungry you do not eat, because the same thing happens to the engine, if you have the escape stuck then it is construcia and do not run as before !

All the best.