A4 1.9TDI - intermittent loss of power
Hi fellow Audi fans, I hope someone out there can help with my power problem.
I am the proud owner of a '78 A4 Avant 1.9TDI Quattro which to date at 137k has been faultless - full Audi service history. However, recently the car has started to lose power intermittently whilst driving. The engine is fine and then all of a sudden, you put your foot down and nothing, the car will barely rev above 3000 (dangerous if overtaking). If I stop, switch off the engine and re-start it is fine again.
The fault seems to occur after a period of idling, ie traffic or coasting down a long hill, its fine for the next mile say and then it dies.
I have replaced the air flow sensor (£80) and this has made no difference.
I would be grateful if anyone has any suggestions, before I end up paying silly money to the Audi dealer to try and find the fault.
Still have intermittent loss of power
Thanks tubtub for your suggestion.
So far I have changed the airflow sensor £75.20 audi part DIY - no different.
Audi dealer diagnosed manifold air pressure sensor, fited by them £143.66 - no different.
As you can imagine I am becoming very frustrated as well a s skint !
I will suggest the N75 valve to my dealer, what is it exactly? It does seeem like the tail wagging the dog - I thought Audi were good !!!!