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Nissan Navara 2007: Fuel injector reliability

I am looking at buying a 2007 Nissan Navara STX 2.5-litre 4-cylinder from a private seller. It has done approx. 150,000 km and appears to have been well looked after with service history etc., but I am concerned about the fuel-injectors, as I have been told they are prone to go around the 150,000 km stage. Is there something I should look for that might indicate that there maybe a problem? It has also been fitted with a diesel chip and when the revs are between 1000 and 2000 rpm it makes a ticking noise. Could this be because of the chip?

Injector wear is a problem with all common-rail diesels, not just the Nissan. You should be able observe rough running, perhaps black smoke from the exhaust, and high fuel consumption. The chip won't be causing your ticking noise; that will be a mechanical noise. You need to determine where the noise is coming from to be able to locate the cause. One thing I would be looking at the camshaft timing chain, they wear and sometimes break on the Navara, and that's one possible source of your ticking noise.

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