Noisy engine when cold starting, sometimes

[Masospaghetti]

Any common culprits that would cause a noisy cold engine? Sounds like lifters, goes away after a second or two once oil pressure builds. It doesn't always do it, either. I heard there were some o-rings and a check valve that might go bad. Would a bad tensioner also do this?

[EODguy]

Originally Posted by Masospaghetti

Any common culprits that would cause a noisy cold engine? Sounds like lifters, goes away after a second or two once oil pressure builds. It doesn't always do it, either. I heard there were some o-rings and a check valve that might go bad. Would a bad tensioner also do this?

Dirty filter screens in the vanos are a distinct possibility...

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[Masospaghetti]

Originally Posted by EODguy

Dirty filter screens in the vanos are a distinct possibility...

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Where are the vanos filter screens?

[Homerlovesbeer]

I was also going to mention Vanos system oil pressure

[andrewwynn]

When my engine was cold it always ticked a bit while the lifters and chain tensioner primed, but what i noticed is it took a lot of time i was low on oil.

[EODguy]

N52, I'll look for the M54 and N62 in a bit.

[EODguy]

I believe the M54 (no personal experience) have a non-replaceable permanent screen.

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[80stech]

There are some times that there is too much clearance in the thrust brgs for the vanos and there is a kit available to fix it, I haven't had this happen (I don't think) and don't know how similar the sound would be but you could maybe find an example on you-tube. If it's only for a second or 2 I wouldn't worry about it much other than it might be nice just to know what it is.

[andrewwynn]

My M54s both used to lifer tick pretty obvious for about two seconds when cold starting.

When my oil got low, that would last 5-6 seconds.

If this is what's happening i believe is normal.

[Masospaghetti]

I checked the oil and it was a bit low, added maybe a quart. Noise went away for now? Seems to have done the trick although I don't really understand it.