Question about 2005 Fiat Pininfarina
I would suspect a system that is only supposed to work in mid range.
I don't know the European pollution laws, but in the US, the ERG or purge valves can cause this sort of symptom.
Both are essentially small intake manifold leaks, that mess up the mixture to some degree.
The EGR (exhaust gas recirculation) is just terrible in that the exhaust deposits clog the valve and cause it to bind open, while also harming the valves as well as performance and mileage. I would remove an EGR system UNLESS the engine is so high of compression, that it requires exhaust to poison the mixture, in order to prevent pre-detonation from compression, with low octane gasoline.
The purge valve is to vent the gas tank, to prevent both vaccum or excess pressure releasing gas fumes to the atmosphere.
Posted on Oct 05, 2010
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Posted on Jan 02, 2017
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