This is too hit and miss to be reliable. It's exactly the reason why the pump should be timed (by a specialist) and locked before fitting. The pulley is then fitted in it's correct position as dictated by it's locking pin.
pump has come from an ex xpart dealership, so pretty sure pump is a-ok, air leak after maf could be it, i didnt replace gaskets on egr, or inlet to inlet manifold! BUT would this cause hunting??If your pump has come from a diesel specialist then I would be reluctant to rotate the pulley on the pump shaft.
Could be a sensor issue. Maybe an air leak after the MAF.
Try unplugging the MAF.
pump has come from an ex xpart dealership, so pretty sure pump is a-ok, air leak after maf could be it, i didnt replace gaskets on egr, or inlet to inlet manifold! BUT would this cause hunting??
perfectly
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