Thursday, 24 December 2015

Volkswagen Touareg 3.0 TDI engine jerks

Chapaletas de turbulencia de admisión
Intake swirl flaps
This new post reflects a failure registered in the flap motor of the intake manifold used in 3.0 TDi Common Rail engines of the Volkswagen Touareg. They have two electric motors, one for each bank.

The function of these two motors is to configure the spiroid swirls of intake air, depending on the regime and load of the engine.

At low regimes, the swirl valves are closed, improving the quality of the mixture. Between 1,250 and 2,750 rpm the swirl valves open continuously; from 2,750 rpm onwards the swirl valves stay fully open. In start-up phase and in emergency phase the swirl valves are also fully open.


The vehicle responds with some unusual jerks. The engine failure engine light stays lit.

Friday, 18 December 2015

Bearing failures

The main causes of premature end of life of the bearings are: improper lubrication, contamination, excessive overload, improper use and/or mishandling or improper installation.

Statistics concerning the causes of premature end of life of these elements are the following:

ráfico sobre las causas de degradación prematura de rodamientos
Chart on the causes of premature degradation of bearings
A premature end of life of the bearings means an additional expense for the customer, since they are expected to last as long as the vehicle, although for the reasons above this is not always the case.

Rodamiento contaminado por partículas externas
Bearing contaminated by foreign particles
Contamination by foreign particles can cause problems with the correct operation of the bearings.

Dust, dirt or any kind of foreign particles can affect the lubrication of the bearings.

Water is a particular contaminating agent; an amount of 1% water in grease or oil can mean reduced lubricant life. Humidity and water contamination produce a chemical attack and corrosion in the bearings. 

Wednesday, 9 December 2015

Lack of power in Audi and Volkswagen 2.8 and 3.0 petrol engines

Motor 2.8 V6 de AUDI A6
AUDI A6 2.8 Engine

This post discusses a failure caused by a marked lack of power, especially at high engine speeds or in the torque transmission phase, in 2.8 and 3.0 petrol engines of the Audi and Volkswagen brands.

The engines motors affected are the following:

 AMX PASSAT 3.0 engine. (Petrol).

AUDI A6 ACK 2.8 engine. (Petrol).

AUDI A4 ABC 2.8 engine. (Petrol).


The vehicle does not deliver adequate power and on the other hand, the vehicle has poor torque delivery.


Thursday, 3 December 2015

Engine start-up failure in BMW models

Engine start-up failure in BMW models
Today we will describe a failure that affects the X6 35 xdrive aut. E71 (30 6D 5) model of the BMW brand, specifically a failure related to the engine.  

BMW X6 35 xdrive aut. E71 (30 6D 5)

The engine does not start.

Failures codes reported by the DDE engine control unit.

507D – Parking lock deactivated erroneously.
CF37 – CAS messages in the wrong K bus.

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