Question about 2005 Fiat Pininfarina

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My 52 plate Stilo 1.9 JTD has an ongoing fault of engine backing off at high speed (but maintains this speed if you accelerate away) and cutting out altogether when slowing down to idle for a junction for example. I've changed the fuel filter and checked ecu/sensor connections but all seems ok. I get no fault up on the dash when the fault is evident. Also the last time the fault occurred was about 8 months ago. There is plenty of fuel pressure to and from the filter housing so i'm guessing the low pressure fuel system is fine. I also think the high pressure fuel system is ok as I can drive 'through' the fault and even accelerate while the fault is apparent.

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  • Fiat Master
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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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You can take it off and remove all the carbon crud thats built up inside but the problem WILL return unfortunately. Its a mechanical failure so no error codes will be shown for this fault. You can also block them off which will return all of your power but also possibly make it an MOT failure due to excess soot coming from the exhaust.

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