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Posted on Jan 02, 2017
SOURCE: Nissan KA24E rattle at start up
ah the venerable napz motor extra coil extra plugs and a weak oiling system check oil filter bypass for coked stuck return spring...how many miles on motor? if crank bearings are failing no oil can get to top (warm metal things swell and make it less noticable)
Posted on Jan 14, 2009
Probably a heat shield. Often time the screws that hold the shields in place rust away causing the shield to rattle. After the exhaust heats up, the pipes and shield expand causing the shield to stop rattling until it cools down again later when the car has been sitting for a while. Usually you'll find shields under or around the catalytic converter and around the exhaust pipe nearest to the engine. Most folks would probably recommend you remove the shield and be done with it. That's your call. Just remember though, the shields are there for a reason. In particular, the shield under the catalytic converter is there to prevent the possibility of starting tall grass on fire in the event you had to pull off the road for example to fix a flat tire or something along those lines. It might be unlikely, but its definitely been known to happen. Let us know how it goes. Thanks.
Posted on Feb 20, 2009
It sounds like the hydraulic lifters are bleeding down after sitting for a while... there are ball checks which are supposed to prevent this... Try using a good engine flush (a product that frees sticky lifters) and replace the oil with a good synthetic... Hope this helps...;-)
Posted on Apr 28, 2009
The oil pump is not getting oil into the top of the engine quick enough on start up
I have a similar problem with a Mazda
Got over it by adding a can of STP Oil treatment to the engine
That coats the surfaces better than the standard oils and cuts down on the noise and the wear factor
Posted on Jul 10, 2009
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