Navara makes pinging noise when cold

Nissan Nissan Advice Nissan Navara Nissan Navara Advice Nissan Navara 2007
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The motor in my 2007 Nissan Navara 2.5-litre turbo-diesel stutters or hesitates and makes a pinging noise when it's cold, but it's okay when it's warm. I have had it to two mechanics and they couldn't fix it. What's wrong?

Check the injectors, your problems are most likely there.

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