Under the bonnet, check fuel pipe connections for leakage, and on TD5 and later models check the condition and electrical le ads to the injectors. Keep the heater plugs and their leads clean and terminals tight and free of corrosion. Heaters really fail, but if one does difficult starting or initial rough running, replace the all.
Withdraw them carefully, though, applying easing oil as they come out the internal sheath and break away and be left inside. Injector last and well on a properly serviced engine but think about having them overhauled or replaced after around 70,000 miles if the engine smokes or is not running at its peak, especially Series types.
On vehicle with engine control module ECM the software will have adapted itself to suit the subtle characteristics of each injector, so if you remove them for inspection and refit ensure they are positioned in their original order. Injector test and overall is a specialist task, so find one and let them do the whole job.
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