Problemas con A4LD

[Gabytaurus]

Buen dia gente, tengo un problema con mi A4LD: viajando dejo de funcionar el OD y ahora unos dias despues no cambia automaticamente de marchas.
Desrme y saque el cuerpo de valvulas, lo limpie y volvi a colocar y nada.
Los solenoides los probe y estan dentro de los valores normales.
Que puede estar pasando? Por donde empiezo a buscar el problema?
Agradezco sus respuestas y recomendaciones.

 

[ChildIdenticant]

Welcome to Explorerforum.
What is the mileage of your Explorer?

Out of curiosity, and if not inconvenient, do you have photos of your Explorer? I have not seen one from Buenos Aires and wonder if there are differences.

If the selector is in the "Over drive" position, will the Explorer automatically shift at all at any speed?

If the selector is in the "Drive" position, will the Explorer automatically shift at allat any speed?

If the selelector is in the "1" position, and you accelerate to ≈17mph, and then move the selector to "2", will the Explorer shift in to second gear?


When you uninstalled the valve body, did you verify that all of the valves move freely?
Removal of the separator plate would have been necessary to do this. Proper torque is crucial when replacing.

Good practice suggests first checking vacuum connections.
Have you verified proper transmission fluid level?
Have you verified no coolant is leaking into the transmission from within the radiator?

 

[Gabytaurus]

Gracias por responder!
En "D" no cambia de velocidades, solo queda en 1.
En "OD" es igual a "D".
Si yo cambio de marcha de 1 a 2, funciona perfecto.
Mi problema es que no cambia de marcha automaticamente.

 

[ChildIdenticant]

Thank you for the photos. It appears your Explorer has extra badges near the mirror and tail light. Interesting to learn.

When the selector is moved from "1" to "2" after exceeding ≈15mph, it is technically considered an automatic shift.
The selector/lever should not be thought of as a shifter. It should be thought of as a "lock out". It prevents the transmission from automatically shifting into a higher gear than selected.

As I interpret your response, you are able to force the transition from "first gear" to "second gear" by moving the selector from "1" to "2" at ≈15 mph. Judging by your description, and the posts on this forum that I have read, and my own experience, if your transmission has ≈150,000 miles or more, some valves in the "valve body" are likely sticking. Does the shifting improve in either colder or hotter ambient conditions? I had very similar shifting issues at about 165,000. The shifting would be slightly more reliable in cold weather (<68°F).

If there is any significant difference in shifting shortly after "cold start" condition that can be correlated to outside air temperature differences, I would very likely suspect a valve body issue. The failure of lower gear shifting within days of noticing the failure of "OD", is not as common.
Do check the vacuum thoroughly before uninstalling the "valve body", to be prudent.

It may be wise to wait for others to respond. I have only worked on 3 A4LD's.
Do you have access to the literature for the A4LD?

 

[Gabytaurus]

Gracias por las fotos. Parece que su Explorer tiene insignias adicionales cerca del espejo y la luz trasera. Interesante para aprender.

Cuando el selector se mueve de "1" a "2" después de exceder ≈15 mph, técnicamente se considera un cambio automático.
El selector/palanca no debe considerarse como una palanca de cambios. Debe considerarse como un "bloqueo". Evita que la transmisión cambie automáticamente a una marcha superior a la seleccionada.

Mientras interpreto su respuesta, puede forzar la transición de "primera marcha" a "segunda marcha" moviendo el selector de "1" a "2" a ≈15 mph. A juzgar por su descripción y las publicaciones en este foro que he leído, y mi propia experiencia, si su transmisión tiene ≈150,000 millas o más, es probable que algunas válvulas en el "cuerpo de válvula" se atasquen. ¿Mejora el cambio en condiciones ambientales más frías o más calientes? Tuve problemas de cambio muy similares en alrededor de 165,000. El cambio sería un poco más confiable en clima frío (<68°F).

Si hay alguna diferencia significativa en el cambio poco después de la condición de "arranque en frío" que se puede correlacionar con las diferencias de temperatura del aire exterior, es muy probable que sospeche que se trata de un problema con el cuerpo de la válvula. La falla del cambio de marcha inferior a los pocos días de notar la falla de "OD" no es tan común.
Verifique el vacío a fondo antes de desinstalar el "cuerpo de la válvula", para ser prudente.

Puede ser prudente esperar a que otros respondan. Solo he trabajado en 3 A4LD.
¿Tiene acceso a la literatura para el A4LD?

¡Gracias por la información!
No tengo variacion en el funcionamiento en frio o caliente.
Asumo yo tambien que es cuerpo de valvulas y tal vez un problema de vacio, pero queria tener otras opiniones.
Yo reconstrui por completo esta transmision hace 1 año aproximadamente y funciono perfectamente hasta ahora.
Voy a esperar algun otro comentario antes de desarmar la transmision.

 

[Gabytaurus]

Thank you for the photos. It appears your Explorer has extra badges near the mirror and tail light. Interesting to learn.

When the selector is moved from "1" to "2" after exceeding ≈15mph, it is technically considered an automatic shift.
The selector/lever should not be thought of as a shifter. It should be thought of as a "lock out". It prevents the transmission from automatically shifting into a higher gear than selected.

As I interpret your response, you are able to force the transition from "first gear" to "second gear" by moving the selector from "1" to "2" at ≈15 mph. Judging by your description, and the posts on this forum that I have read, and my own experience, if your transmission has ≈150,000 miles or more, some valves in the "valve body" are likely sticking. Does the shifting improve in either colder or hotter ambient conditions? I had very similar shifting issues at about 165,000. The shifting would be slightly more reliable in cold weather (<68°F).

If there is any significant difference in shifting shortly after "cold start" condition that can be correlated to outside air temperature differences, I would very likely suspect a valve body issue. The failure of lower gear shifting within days of noticing the failure of "OD", is not as common.
Do check the vacuum thoroughly before uninstalling the "valve body", to be prudent.

It may be wise to wait for others to respond. I have only worked on 3 A4LD's.
Do you have access to the literature for the A4LD?

Si tenes literatura sobre la A4LD y me la pudieras compartir, seria fantastico.
Solo tengo un despiece de una A4LD de un Ford Sierra de Venezuela.
Me gustaria desarmar el cuerpo de valvulas y poder chequearlo con algun plano.