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Re: Tapping noise in the engine
That noise is most likely cam follower noise ( formally know as lifters), this is common but no normal, it should disappear after a few seconds when the engine is started, talk to the dealer about the noise, he may be able to help even if you are out of warranty.
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could possibly be a lifter tapping (Ticking) ,depending on how many miles the vehicle has on it might be time for lifters to be adjusted,most foreign overhead cam engines must have lifters adjuster periodically ,if you turn on the air its puts more of a load on the engine causing a louder sound (also check oil level an engine low on oil will start to tick too.. the more wear the engine gets the looser the lifters can get over time ,look in your service manual if you have one and see what the intervals are on lifter adjustment this can give you an idea.
possible only if
the ticking sound is coming from the top of the engine usually comes from under the vavle covers where the lifters are located,
alot of the 4clys had ajustable tappets that might need adjusting
V6 have tappets adjusted also but are shims on top of bucket over valve spring, this is hard to do as you may need to change shims to get correct valve clearances suggest dealer to do.
if the noise comes in and out while maintaining 1500-2000rpm when stationary it is possibly worn valve guides which is common on high km vehicle.(head repairs)
The tappet noise usually will get louder and louder as it wears. A totally collapsed lifter will definitely be noticeable by loss of power to that cylinder, misfiring, and excessive noise. But then again your current lifter noise could be possibly maintained for years to come by regular and consistent oil changes.
Tapping and oil burning when both are together are tappet trouble. Get another mecanic to check. Any other part of the engine tapping would get a lot louder after a lot less miles. Sounds like tappets and valve stem seals are worn hence tapping and oil burning.