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Thread: Would anyone know what this tapping is under my beamers hood?

  1. #26
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    How do the exhaust manifolds look? Are the bolts loose? I had headers at one point on a camaro that came lose, thought my engine was toasted. Turned out the exhaust gasket was slapping the side of the block. Seems to me that if it was a lifter, it would still be ticking when you took plug 3 out. I would check the exhaust manifold bolts for tightness and make sure the gasket still looks good.

  2. #27
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    Pretty sure its the rod bearings sleepy, The pinging goes away once the spark plug is pulled, Just wondering if this job could be tackled underside up and is its just a deal of sliding the rod bearings in. I will take a look at that gasket just to make sure its sitting right. Looks like everything on this car is pretty much ow it was when it rolled out of the factory.

  3. #28
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    It's possible to just drop the pan and slap a new bearing in as long as the crank isn't too scored.

  4. #29
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    I think a lot of what is being in this thread is ...well, frankly, inaccurate. Blows my mind your talking about rebuilding the engine without even having properly diagnosed what this issue is.

    Not to mention that you KNOW there is an exhaust leak...
    Quote Originally Posted by hatefuel66 View Post
    There is also a rust hole in the muffler
    I also see NOTHING to substantiate the idea that its a rod bearing failure. I'm not even going to go into that discussion but I am quite enjoying some of these "theories"
    Last edited by BimmerBreaker; 11-06-2014 at 08:59 PM.

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  5. #30
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    Quote Originally Posted by BimmerBreaker View Post
    I think a lot of what is being in this thread is ...well, frankly, inaccurate. Blows my mind your talking about rebuilding the engine without even having properly diagnosed what this issue is.

    Not to mention that you KNOW there is an exhaust leak...


    I also see NOTHING to substantiate the idea that its a rod bearing failure. I'm not even going to go into that discussion but I am quite enjoying some of these "theories"
    Be nice, friend, we aint all wizards lol. Gets hard to diag over the net.
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  6. #31
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    Seems to me the rod would still slap even with the plug out. Sound goes away with out. I find this very telling.

  7. #32
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    The noise sounds to me like a rod knock. If you rev it a bit higher does it rattle on the over-run? You've run it without the spark plug?? Unplugged the coil perhaps? If the noise abates or significantly diminishes with the coil unplugged(combustion load removed)you can be pretty sure it is a loose rod bearing.
    With a higher rev a loose rod bearing will often rattle on the over-run.
    Valve train sounds noisy too.
    This happened just after purchase on the drive home? I'd be having a serious talk with the seller about now.

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  8. #33
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    No compression and no load on the rod with the plug out.

  9. #34
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    Quote Originally Posted by Sleepyhead97 View Post
    Seems to me the rod would still slap even with the plug out. Sound goes away with out. I find this very telling.
    This is my concern, knock can diminish without the load of compression and such but going away entirely sounds odd.
    1991 BMW 325i(Current Daily) (S52)
    I have carburetors, and I'm not afraid to use them!
    There are always other fish (engines) in the sea (Craigslist)
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  10. #35
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    Quote Originally Posted by testify View Post
    No compression and no load on the rod with the plug out.
    No load at all?


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  11. #36
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    Quote Originally Posted by BimmerBreaker View Post
    No load at all?

    nice.

  12. #37
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    amazing work

  13. #38
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  14. #39
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    Not so much a signature as a cry for help.

    Hold on, saw this in a cartoon once...think I can pull it off.

  15. #40
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    Almighty seeing bimmerbreaker, What do you think? I'm am a hvac mechanic by trade, not an auto mechanic. I can follow instructions out of a Bentley/chiltons... Ross1, I ran the engine, pulled the plugs separately one by one, ie pull number one, insert, pull number 2 reinsert ect until I came to three and pulled the plug out and the noise stopped. Noise speeds up on acceleration. Lol I should really make a video. Pretty much learned that if you have a problem someone else out there has had the same problem and asked in forums. appreciate the help fella's

  16. #41
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    I think its silly to expect people to accurately diagnose what the sound is based just on a youtube video since even the same noise will sound radically different with different cameras or microphones. Its a good start, sure, but when the posts start immediately thinking catastrophic failure is imminent it quickly goes from helpful to ...helpless.

    I would start at the KNOWN problem, the rust hole in the header, and go from there. At least get it welded shut to determine if thats the problem or not and if it is, replace the part.

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  17. #42
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    I understand what you are saying bimmerbreaker, But as with everything in life, if you expect the worst the when it isn't as bad as you thought its more of a relief. Hell if i can get out with a cheaper fix then an engine I'm a happy camper. Not too sure where the rust in the header came from, I do not recall mentioning i had a rust hole in the header. The rust was located on the underside of the muffler. Someone suggested making sure a gasket on the header was not lose. Out of politeness and someone being helpful i said i would check it. I full well know its a metallic pinging in the engine, I also know that it is related to cylinder 3, example my TV is not coming on, Well check if it is plugged in. So i welcome advice like so. if i check it and there's something up with the headers n that advice has come in handy one way or another. I will post a video. The sound i posted was pretty much exactly how it sounds in person. I shout film in my spare time, so its not a tape Dictaphone its a professional recording device.

  18. #43
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    Check your tensioner

  19. #44
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    Sorry about the type o's using my phone with auto correct, would the tentioner having an issue create a problem on one singular cylinder? What should I be looking at on the tensioner? Thanks

  20. #45
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    Change your spark plugs mate, if the sound stops when you take it out, sound to me like the spark plug at some time has Been over tightened reducing the thickness of its squash washer, I have had this problem before. Hope this helps mate

  21. #46
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    Would anyone know what this tapping is under my beamers hood?

    After the muffler is fixed I would look to see if you have adequate oil pressure to your head. Ticking is only a few things. Exhaust leak, inadequate oil psi resulting in lifter not pumping up, sticky lifter, vanos issues.
    Knocking is a different ballpark. The Z line had aluminum blocks right? Or is that just In The 6's? If you had a bearing failure then I'm pretty sure you would have chucked the rod out the block by now.

  22. #47
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    Could well be a dud lifter seeing as when you back of the revs it gets louder as the gap between the lifter and cam has more time to increase causing a deeper sound?

  23. #48
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    Just my 0.02¢ - sounds like a rod knock on the recording. Too low of a pitch to be a lifter.
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  24. #49
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    Rod bearing.my $0.02

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  25. #50
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    I'm pretty sure its a its the rod bearing as well, was told by a friend that it could quite possibly be the valve springs if the Car has been siting for ages a compressed spring could lose its springiness , From what I can see lifting that cylinder to top dead center and then the opposite there is not play in.

    - - - Updated - - -

    Im guessing next step is to jack the car up, take the oil pan off and have a gander at the bottom side...

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