Rattling noise 2006 vz

[Alias7]

Hi there,
I have a commodore vz ( v6 ) 2006 & I just did timing chain & oil pump on it, after finishing the job it was running very smooth & quiet, as soon as i took it for test drive, I notice a rattling noise started coming & it goes worst when I accelerate.
I need your help guys please.
Is anyone has faced this before please, help me out
Thank you

 

[Alias7]

P1632-48 immobiliser fuel disable signal received
P0343-00 intake camshaft position sensor high voltage bank 1
02 sensor signal short to heater circuit bank 1 sensor 1
I don’t think so any of these are related to the rattling noise.

 

[Alias7]

Noise only comes when car is hot.
After sometimes. There’s no more code now I think it’s lacking oil pressure.

 

[Alias7]

Just realise, after sometimes it drops down the oil pressure & there’s no oil pressure, I changed the oil pump & timing chain,
Is there anything else.

 

[krusing]

Did you fit the OP gasket supplied ?,
torque OP bolts up ?,

Was it a cheap OP, or a reputable brand, and get from a reputable seller ?
As there are some crappy ones on the market.
Assuming you left the chain guide on the replacement oil pump.

Your location is ?
As some members maybe able provide a recommendation to have it looked at.