2008 Holden Commodore Starting issues and rough idle

2008 HOLDEN COMMODORE
145,000 MILES • 3.8L • V6 • RWD • AUTOMATIC
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RHYSMCDONALD
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I have a ve omega which has a problem when I start up first thing in the morning. After about 10 seconds after I turn it on it makes a terrible noise and sounds like it's knocking and running on 2 cylinders but then comes good and wont make the same noise again all day. But then when I start it after that it won't make the noise it just runs really lumpy on start up for around 10 seconds and then come good and will only do it sometimes other times it will start fine like nothing's wrong at all. And it also has a problem starting on a hill when the car is pointing bonnet downwards on the hill it's a very frustrating issue please help
Oct 29, 2014 at 2:26 PM
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MHPAUTOS
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check oil pressure when first starting, check that the oil filter has not fallen apart and started to be drawn into the engine oil system
Nov 1, 2014 at 3:31 AM
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RHYSMCDONALD
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I have recently dropped the oil and replaced the filter and it didn't fix the issue and what would make it have a clacking noise on cold startup
Nov 1, 2014 at 5:08 AM
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MHPAUTOS
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sounds like lifter noise, may be lacking enough oil pressure on cold start up, you need to hook up a mechanical gauge and see how long oil pressure take to build up and see if this collates with the noise.
Nov 6, 2014 at 1:47 AM