¿Qué es esto: "Solving the "Slow-down Shudder"?

[pentinat]

Mi nivel de inglés no es todo lo bueno que dabería y he estado viendo tdiclub y me he encontrado con esto:

[code]Solving the "Slow-down Shudder" and Other Shudder Issues - Recalibrating the Fuel Quantity at Idle - A VW specific scan tool such as VAG-COM is required for this procedure. With the engine warmed up and running at idle in neutral with all major accessories such as air conditioning turned off, connect the scan tool cable and start the scan tool software. Select engine control module. "Login" using 12233 as the access code. Select "adaptation" and go to adaptation block 1. Note that the display shows a default adaptation value of 32768 and shows the amount of fuel being delivered in milligrams per stroke. (If it does not show this, you are either on the wrong screen, or you have an older ECU that differs slightly - see next paragraph.) The specification range for reported fuel delivery at idle is 2.2 to 9.0 mg/stroke and they normally run best between 3.0 and 5.0 mg/stroke (highly tuned non-stock engines may differ - you'll have to experiment in that case). If you see a number smaller than your desired range, enter an adaptation number that is slightly smaller (say 100 units smaller than where it is now) and "test", to see the effect. Adjust the adaptation number up or down as required to achieve a reported fuel injection quantity as close as possible to your target. It is only possible to adjust within a very limited range using this method but experience has found that it doesn't take much change to make a big effect in the shuddering. Once you get a proper setting, "save" it.
Note for '96 Passat and possibly other older ECU variations: The adaptation numbers are in a different range, and you won't be able to get feedback on what you are doing on the same screen. You'll have to flip between "measuring blocks" group 1 and "adaptation" block 1 to see what's going on.

Physical adjustment of the upper section of the pump is also possible to recalibrate the fuel quantity but it is strongly recommended that the adaptation method be used first. The physical adjustment method requires the use of a special tool to loosen the special security bolt on the injection pump, then the other 3 bolts that secure the top 2 sections of the pump to the housing (you can leave the upper cover in place - it's movement at the second split that you are after). In addition, this method still requires the use of VAG-COM to ensure that the injection quantity remains in the proper range. THIS METHOD IS NOT RECOMMENDED FOR BEGINNERS. It is a "last resort" to solve an engine that persists in not running correctly despite all other attempts, and which has had major surgery performed on the injector pump, and even then, ONLY if a VAG-COM check finds that the pump is out of OEM specifications (2.2 to 9.0 mg/stroke at warm idle in neutral with all accessories off). CAUTION: Improper physical adjustment of the pump is capable of causing an "engine run-away" condition which will result in severe engine damage. ALWAYS ensure that if a physical adjustment is done, that the adaptation setting for group 1 is at factory default and that after completion of all work, the reported quantity at idle is within factory specifications.[/code]

 

¿Alguien se lo ha "hecho" al su tdi? ¿Es "recomendable"? Se gana en algo?

 

Gracias.

Editado 4 de Septiembre del 2005 por pentinat

[Sugarless]

Tiene pinta de ser algo de subir el caudal de la inyeccion. Si de verdad es eso no lo hagas, ya q lo unico q consigues es inyectar mas combustible y obtener mayores humaredas.