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Please assist, my Nissan pathfinder yd25 engine is low when accelerating after replacing a new cylinder head
 

Horatius

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Need more info Wilbert.

What exactly is it doing, do you mean it's "slow" when accellerating? Why did you replace the head? Anything else done to it?
 

Old.Tony

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Please also tell us about any smoke that you might see, if there's lots of black smoke you might just have a loose/leaking vacuum line to the turbocharger.
 

Old.Tony

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With no smoke we'll assume the turbocharger is ok.

If the car thinks it is in neutral it will behave like this, the ECU won't allow full power in neutral or park. It's worth checking the plugs on the gearbox to make sure one hasn't come loose.

Also, air in the fuel system can cause trouble. Please try this: find the primer bulb (under the fuel filter usually) and squeeze it a few times. Is it quite firm? How many times do you have to squeeze it to make it firm?

Can you connect a diagnostic tool to the car and see what boost pressure you are getting when accelerating from 0km/h to 60km/h with your foot at 50% to 75% throttle? You should be seeing 18psi or more.
 
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