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2004 Honda Civic EX 65k miles.

It only makes this noise between 2200-2500 RPM. You really can only hear it when the car is at a stand-still and you rev the engine, other than that, while I'm driving I don't even notice it. In terms of the engine, I have had no problems thus far. I do regular oil changes and preventative maintenance. I still get 30 MPG, no overheating, no leaks or anything, no metal or water in the oil or anything, no smoke out the exhaust.

I don't push the car hard. I do give it the beans when I overtake (I have a MT), but I have never bounced the engine off the limiter. In fact, I don't think I ever pushed the engine above 6k (I think redline is 6800).

Any thoughts or suggestions would be appreciated. Someone said it could just be the sound of the intake or valves or piston slap. Your thoughts on this? I'm not even sure what the difference between piston slap and rod knock is.

Appreciate the help!

 
Rep Power: 186

I have an 2002 ex auto 85k. My sounds exactly the same when I rev it like that from the engine bay. If you have rod knock then I have rod knock, but I don't think it's rod knock or you'd probably notice it at idle as well.

EDIT: You know I just went and listened to mine and it doesn't sound like that now. It's pretty clean sounding. I just did a valve adjustment when I changed my HG. I wonder if that's just the sound of loose valves at higher RPM. I've seen a lot of youtube videos of people with civics that sound exactly the same, but are calling it rod knock.

I think it would sound more like this at idle if you had rod knock.

 
Rep Power: 518

I vote "it's bad".
It won't heal itself.

Do the same light revving so the noise is obvious, and then disconnect each coil one at a time to cancel that cylinder. Rev it again. Note noises. Reconnect the coil.

Repeat for all cylinders.

See which one cylinder has the most effect on the noise using this method (should get quiet). That's the bad one.


--------------------------------------------

Matts vid of the Celica, that engine is just a goner. Painful, ouch. Sounds like pistons are hitting the head.

Bearings like that are probably completely wiped out, missing.



When the knock is light, as in the other video, the noises are most obvious in the 2k-2.5k range under light acceleration (load), and quiet under deceleration (no load).

HTH

 
Rep Power: 186

Really, bad? The sound is still suddle in my car, but why with proper maintenance would this occur? It's not as pronounced after I did the valve adjustment. I've seen multiple civic youtube videos with this sound. All these these are rod knocks?

I know anythings possible, but this would just be the icing on the cake for a rod/crank/bearing to be damaged after solid maintenance all these years.

Well, until it sounds like the video I posted, I'm not doing anything about it because the car drives great and sounds great. Fuel mileage is way up after the HG job.

 
Rep Power: 518

The engine in the dark vid had a definite rattle during the acceleration, and it definitely subsided as the RPM dropped (deceleration). Loading and unloading changed the intensity of the noise.
Canceling a cylinder removes the load from that piston/rod/bearing.

Try it on yours if you think you have the issue.



Valvetrain noise is unaffected by loading.


The majority of lower end bearing failures can be traced back to a lubrication failure, no matter whether the owner admits it or not.

 
Rep Power: 186

If this is the case, I'm done with this vehicle. I changed the oil on this vehicle every three months since I bought this vehicle brand new with 33 miles on it 10 years ago. I have no doubt that I did this since I did the service. I used dino in the early years and full synthetic in the last 2 years.

That picture of my head in the other thread should show you I changed the oil on a very regular, maybe excessive basis.

Ohhhh, I'm just so pissed right now. Sorry for the rant. I'll disconnect the coil on each one and see where it goes. I'll record a video for reference as well.

 
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Doesn't really sound like my engines rod knock, from idle you could hear it. Pulled the oil pan to find no conrod bearing and a damaged shaft lol. Just pulled the motor tonight.

 
Rep Power: 518

If the bearing inserts were missing, that engine should have sounded like the one in that Celica video. Piston hitting the bottom of the cylinder head.

 
Rep Power: 518

Don't freak out yet.

If oil has never been run too low, and all the rest is as you say, it probably isn't bearing noise. You still have low miles, right?

BTW "lubrication failure" can be anything. Water, fuel, condensation, dirt, coolant in the oil, etc.



It's tough to discern most noises on this laptop, but some really stand out.

 
Rep Power: 186

Ahh, I'm not freakin out. I just hate when things don't sound right, but you know I've been hearing my sound for a few years now and never thought much of it. It's definitely hasn't gotten any worse.

BTW, you(ezone) need to get yourself a descent pair of headsets since you're so willing to help us with our issues. I recommend the links below since I also repair/build computers on the side and make recommendations for upgrades.

http://www.logitech.com/en-us/webcam...-sound-headset

or splurge a little:

http://www.logitech.com/en-us/webcam...g-headset-g930

 
Rep Power: 518

Bottom end bearing noises tend to get worse in a hurry once they start. I don't think you have anything to worry about (yet).


I actually do have a surround sound with a sub that I can plug in if I really want......but I'm around loud stuff all day. And I'd have to carry this out to the TV in the living room to plug it in.

This is my quiet time.


The scoot has open pipes too, and that crap can be deafening.

 
Rep Power: 186

Are you talking about a headset or a speaker system? I own that G930 headset in the link I sent you and it's phenomenal. Sound has never been so good since I bought this set a year or so ago. The G35 is the same except wired. I know you're around noise but these headsets are phenomenal if you want to hear a video as best you can.

 
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Speakers. They are hooked to the TV in the living room right now.

 
Rep Power: 186

Those links I sent you are USB wired or wireless headsets that would plug right in to that little laptop you have. They would sound infinitely better than the laptop speakers you're rocking.

 
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Hehe, thanks for the help guys. I love reading your conversations because, as you guys discuss, you answer some new questions that come to mind. I can't speak for the first owner (I'm the second), but I have always changed the oil and filter every 5k. I also have records from the first owner of all the service work he did to the car, and everything looks fine in terms of oil changes, fluid flushes, and what not (all done at the Honda dealer). I'll go ahead and try what you suggested about disconnecting the coils to hone in on which cyl. is going bad.

Someone mentioned to me that it's not necessarily rod knock because if it were you would heard it across the rev range (idle up to whatever). I know you (ezone) talked about "load," and basically what I am interpreting here is that, if I do have rod knock, it's in the beginning stages, after which it will progressively get worse and more noticeable across the rev band. Is this correct?

Matt 75: please do post videos of your engine so that we can compare. I'll upload a clearer video tomorrow (hopefully).

Thanks again guys.

 
Rep Power: 186

That makes sense to me. When I go above 2500 rpm or below 2200 rpm the sound goes away as well. If it were rod knock I would think it would be across the whole range. I wouldn't think there would be a "sweet spot" or rpm range in this case, for rod knock, but, as always, I could be wrong.

I've been aware of this sound since I did my timing belt almost 3 years ago and it hasn't gotten any worse and sounded exactly like your video em2maxamillian.

 
Rep Power: 518

Not necessarily.
As I said before, 2K-2.5K is the range they are most often heard in.
The rpm range may broaden as they get worse.

There could be other things, such as piston slap, carbon knock, wrist pin knock, broken skirt, bent rod, plus more. There are many components in the rotating and reciprocating assemblies. A problem in any of the areas could cause noise, and the differences are subtle and sometimes they are tough to differentiate much further than which cylinder is most likely affected (even with an experienced ear) if it is indeed isolated to a single cylinder.
Most of them may require a teardown to prove and correct (except carbon noise).


Basically, one would start with an initial check to figure out what the likely cause of the noise is, then tear it apart to find out for sure. Once it is apart, you sure as hell aren't going to get it to make the noise again, so you had better have a damn good idea of where you need to be looking ahead of time.

Some bathroom reading, read this thread:
http://www.supramania.com/forums/sho...gnosis-and-FAQ

HTH

 
Rep Power: 0

Thanks ezone and Matt75, I looked the article over, but I am definitely not experienced in the breakdown of an engine, so I guess at this point I'll just need to play it by ear and see if the noise intensifies before I make any decision on what's next. I was also thinking about valve issues as I do need to have an adjustment done. I reference this video for your consideration. But as you said, ezone, really anything is possible when it comes to engine noises.

[autostream]http://autostream.com/ibcivicforums/?page_type=firebirdplayerthumbnail&framepage=1329& transactionid=1351204781-67491546&posted_by=_www.civicforums.com&youtube_vi deo_id=8rplKf_9-U4[/autostream]

 
Rep Power: 518

First half I could hear random pecks that sounded like valvetrain, second half sounds like it's up on fast idle. I can't tell much else from this vid.


My cat hates it when I turn the volume up LOL.

 
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My rod knock for reference. Sorry for the shaky camera work.

[youtube]http://www.youtube.com/watch?v=dUHHvP8jYPg&feature=youtu.be[/youtube]

 
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I can hear what you are talking about there.

 
Rep Power: 186

And? Rod knock?

 
Rep Power: 518

Maybe I should backpedal. I can hear a rattle that fits the typical conditions. I hear a rattle that seems to be a single (1 of the 4 instead of all 4) cylinder related. If you are concerned, it would need further checking.

I may be like the guy was explaining in the linked post, claiming all noises are a rod bearing when it really could be any number of things. Shoot me now.

GF is 4 hours away and just got her car clobbered.
Apparently tore off a rear quarter and taillight. Tryin to figure out if she can drive it back home without me going to see it. AND she has to go back there on Monday.

 
Rep Power: 186

I'm not concerned about it. It's been the same for at least a couple of years now and maybe longer. I'm gonna live with it until the car dies from whatever damage that sound may be causing.

No biggie man. I'm just glad you could hear it.

I hope she's ok. Good luck with that.

 
Rep Power: 518

She's ok, she is talking (typical female, right?) all over the IM, the phone, and Facebook all at the same time from her hotel room.
Apparently the other person got the tickets (and is a habitual crasher with another recent crash). Showed an insurance card. I just wonder if insurance will total the Saturn---- and am I gonna have to buy her another car now just so she can go back next week.

I JUST bought tires for that car, less than 5000 miles on a set of good Michelins.......

 
Rep Power: 518

This answer should apply to your video too:



More P.C.?

 
Rep Power: 186

Nicely done.

 
Rep Power: 193

My '05 sounds just like that and has for a long time. I feel like it was quieter when I bought it new and gradually got louder over the first year or so; I went from a POS to a new car so it's hard to know for sure though.

If there is something wrong it hasn't gotten any worse over the past 6+ years so I don't think it's anything to worry about.

 
Rep Power: 186

Thank you for posting this. I'm done worrying about it. I think it's been this way for a long time. I bet you could make every single civic in this generation make the same noise. I've heard it on multiple civics in this generation, mostly on youtube.

If it was going to fail I think it would've done it already or at least gotten worse.

I'm going to drink some now.

 
Rep Power: 518

Drink a case or two for me!!

This is looking like it may be a rough weekend and I quit drinking a few years ago.....