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how to diagnose fault with engine ?

I have a 2007 ford fiesta 1.4 tdci and the engine is running really lumpy and is in derate mode. What can it be
Andrew Mitchell, April 2016
The first thing would be to get it onto a code reader for a look at faults stored in your ECU. Make sure your filters are clean and up to date, one thing to check out on these is the fuel delivery pipes from the pump to the filter which incorporates a hand primer,they run under the air filter and are prone to drawing air, maybe worth a look,good luck.

cdc, April 2016
link Click here to see other fixes for Ford Fiesta.