tarquin1867
Member
Just been reading with interest the lack of acceleration thread. My last car before the Croma was a Marea Weekender JTD105. This had a problem 3 times with lack of acceleration. I took it 1st time to a locally recommended auto electrical chap who hadn`t seen under the bonnet of a diesel Marea before. When I described what the problem was he connected his diagnostic screen up to the plug on the car and it came up with a fault number which said it was the ERG valve. However he was not convinced as he had had some Vauxhalls and Renault diesels which had come up with a similar result but even changing the ERG had not cleared the original problem. He then took off the air volume sensor between the airfilter and the turbo intake it was only an electrical resistor with coloured bands on with the wires either side of it showing distinct corrosion. Changing this solved the problem. I had the problem twice more always in the spring after winter weather had done its dampest! This problem must be well known to Fiat as the part is now an exchange part.
One good hint is to change your air filter in the autumn this has meant I had the last two winters without the sensor probs and my son who now has the car has had no problems after the last winter. I hope this is of help to anyone who experiences lack of power . also you can get a lot of air filters for the price of one air volume sensor !!
PS I have been told that the ERG dumps the turbo pressure to the manifold to protect the turbo seals during decelleration , I think it would be foolish to blank it off .
One good hint is to change your air filter in the autumn this has meant I had the last two winters without the sensor probs and my son who now has the car has had no problems after the last winter. I hope this is of help to anyone who experiences lack of power . also you can get a lot of air filters for the price of one air volume sensor !!
PS I have been told that the ERG dumps the turbo pressure to the manifold to protect the turbo seals during decelleration , I think it would be foolish to blank it off .