Engine Bay Noise at 2900-3000 RPM

Old 05-03-2013, 09:25 PM
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Engine Bay Noise at 2900-3000 RPM

I finally purchased an S-2000 on Tuesday. I love the car! Except. . . . I noticed this right away but it has a strange noise coming from the engine area. It happens when I am both in neutral revving and between 1-2nd gear. I don't know if it does it any higher as it gets too loud to hear it.

I spent last couple days researching issues. I don't think it is the intake, I plan on changing the transmission fluid tomorrow (hopefully that will help.) I checked a rattle of the heat shield and it is fine. I also checked the main belt from the top and it seems tight. I have yet to try to clean the carb/transmission that the airbox connects to yet.

So anyways I am out of ideas and am nervous I got a car with an issue. I recorded a video today of the sound, It actually sounds accurate as well.

Any ideas on what this can be?

Here is a video. The noise starts at around 0:14


Thank you in advance for any help.
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Old 05-04-2013, 05:57 AM
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You may want to pull your valve cover and check the valve spring retainers. If it's ever been over rev'd they may have cracked and the valves slip down so the rockers slap the top of the retainer before the top of the valve. There's threads on here about it. Just my first thought when I heard the video. Good luck.
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Old 05-04-2013, 08:56 AM
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What year is your S...AP1 or AP2? I could be wrong, but sounds normal to me, just a difference in the pitch as the engine revs higher. This is a (loud) 4 banger after all.
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Old 05-04-2013, 09:23 AM
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Sounds normal to me. You might want to change the oil (if you haven't already) just for your own peace of mind. That way you know everything is fresh.
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Old 05-04-2013, 10:23 AM
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It is a 2005.

Well I just went to the dealer and asked when the last time the transmission fluid was changed and it was in December at it's 35k inspection. They said there was nothing wrong with the car then when they checked it. The guy also said it seems like a normal sound for this type of vehicle to make.

They offered to inspect everything for $75 but I thought I would check things out myself first.

And yea I plan to change the oil asap just so I can keep my own log.

It's just the first time I owned such a vehicle and so I got nervous when at 2900-3000 it would start making that sound. I will try to see if maybe the underbody heat shields are loose maybe that would be it. Either way I am loving this car!
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Old 05-04-2013, 10:42 AM
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This car makes a lot of gear noise...that's normal. This car makes a LOT of engine noise...that's normal. If you have 35k miles on a 2005, I would say just rev it up to 8k and don't worry too much. Maybe change fluids for peace of mind like Ken says.
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Old 05-04-2013, 06:02 PM
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I hear it.. Sounds like a very fast "Tac-tac-tac-tac-tac-tac-tac-tac" Compare it to another S2000 engine sound vid (there are many out there)
May just be a bad case of lifter tick? Change your oil and see if it's still doing it. Also check for metal shavings and what not when you drain the oil.
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Old 05-04-2013, 07:22 PM
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PoltArt,

Sounds like a TCT (timing chain tensioner) going out. Is the sound less apparent when the engine is cold? Then becomes pronounced when hot? Here's a clip of a TCT, see how it compares to your issue.

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Old 05-05-2013, 03:32 AM
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If it is the Timing Chain Tensioner, contact Billman250 on S2KI.com. He sells a TCT with a lifetime warranty. It takes about 2 minutes to change the TCT if you've never done it before (he did TCTs in 3 cars in about 5 minutes because he's done so many)
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Old 05-06-2013, 05:56 AM
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Originally Posted by Vanishing Point View Post
PoltArt,

Sounds like a TCT (timing chain tensioner) going out. Is the sound less apparent when the engine is cold? Then becomes pronounced when hot? Here's a clip of a TCT, see how it compares to your issue.

Honda S2000 engine noise. TCT (Timing Chain Tensioner) - YouTube

I was thinking this myself.

Originally Posted by kgf3076 View Post
If it is the Timing Chain Tensioner, contact Billman250 on S2KI.com. He sells a TCT with a lifetime warranty. It takes about 2 minutes to change the TCT if you've never done it before (he did TCTs in 3 cars in about 5 minutes because he's done so many)

Billman is THE man!! Good guy and knows his $hit. Had him work on my car recently.
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Old 05-06-2013, 08:46 AM
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It seems TOO easy to change. I have a new one to go in but was going to wait until my guy does the valve seals and retainers at the same time.
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