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Old 13 Jul 2010, 08:57 pm
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Default Non-rhythmic "clang" when accelerating

I know what you're thinking. It's something loose on the exhaust... but i don't think so.

I have a 98 Civic, DX, coupe, manual tranny, with 207,000 miles on it.

For the last 10,000 miles or so, a non-rhythmic clang has developed which only presents itself when there is a load on the engine, ie when I accelerate in gear. The clanging, which sounds like a dime being tossed around in a low-speed blender, starts near the lower rpms and then goes away once the engine reaches a high enough rpm. I have tested the engine in neutral at all rpms to see if the clanging happens and it does not. it ONLY OCCURS IN GEAR, and in EVERY gear.
The higher the gear and the slower the speed starting out in that gear, the louder and more prevalent the clanging. For instance, to test this, I'll deliberately accelerate from say about 10 mph in third gear, and the clanging is very loud from the start and lasts for a long time or at least until the rpms reach high enough.

The timing belt and water pump were replaced recently (last 15k miles or so), so i don't think it's that. The clutch is original, but I drive and shift sensibly. The exhaust system is recent and i've already removed the heat plate so it's nothing loose in the exhaust system.

I stick my head out the window to try and hone its location, but all i can determine is that it's coming from somewhere in front, between the ground and the hood

it hasn't seemed to affect the performance of the car in any way. it's just noisy.

p.s. I love this car!

Last edited by dojabean; 13 Jul 2010 at 09:05 pm.
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Old 14 Jul 2010, 02:51 pm
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Default Re: Non-rhythmic "clang" when accelerating

Hhhmmm....I can't say I have never heared of this happening before and I honestly dont have a definit answer. But If the car only does this in gear and only when the RPM is low and under a load Im gonna take a wild stab at possibly the transmission and heres my flawed logic for it, after over 200,000 miles of driving and even is easy driving, there may be like a chip off the gear, or a piece od debris that may be getting caught between the meshed gears and cycled through with the transmission fluid and at low RPMs it may be cycling through slowly so it makes a louder noise when the debris comes between the gears and at higher rpms the chunk of debris may be running through the gears so fast that the noise becomes quieter. Thats my best guess and ive never heard of this happening before. I hope this helps, if it doesnt, a trip to the dealership may be in order. sorry I couldnt help more.
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Old 14 Jul 2010, 03:05 pm
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Default Re: Non-rhythmic "clang" when accelerating

zman,
thanks for the theory, it sounds very plausible. it also sounds like the only way to find out for sure is to delve into the transmission. can you to the best of your ability explain the mechanics of the tranny, starting from the first point of contact with the engine? the parts, their role, what they look like.

i don't think i'll be tearing apart my tranny

but i'm just curious. trannys are a deep dark hole of unknown to me.

say it were what you said, should i be at all concerned? i mean a piece of metal can't be good, but...
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Old 14 Jul 2010, 04:35 pm
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Default Re: Non-rhythmic "clang" when accelerating

Well, the transmisison is a hard thing to describe but I'll give it my best shot ( im not the best explainer). in quick terms.The engine spins using small explosions and a rotary force and then spins the flywheel, now heres where it gets tricky, the clutch is what connects the transmission to the engine and the clutch does this gradualy with a pressure plate and purposfull slippage with the pressure plate and the flywheel, so now that the clutch pedal has been let off of, the clutch and flywheel are now stuck together and moving the same speed. the clutch connets to the input shaft which spins with the clutch which now moves with the engine, the imput shaft has a series of gears on it of verious sizes which in part makes up the gear ratio, then the imput shaft is connected with the output shaft, which also has a series of gears with diffrent sizes, (see diagram), when the car is put in gear, synchronizers match the speed between the two shaft so that the two shafts can be "meshed" together with dog clutches (to hold the gears together) which means the the gears are connected in a certain combonation and provide the full gear ratio which is engine rpm to output shaft speed. so now that everything is connected, the engine, is transmitting its power to the wheels through the transmission and bam! The car moves, hopefully. When the gears grind, it is because the driver of the car shifted too fast and the syncronizers (which helps the shafts match speed) didnt have time to match the shafts speeds so the dog clutch tried to hold the gears together but the gears just grinded against eachother. You may hear the term over drive, over drive is when the output shaft is spinning faster than the input shaft like in 5th gear, used for optimum economy otherwise your rpm would be redicuously high while driving at highway speeds. I hope this is a good enough explanation for you, again i suck at explaining stuff and im sure some meber here can do a beter job than me.lol.

heres the diagram:
http://www.csa.com/discoveryguides/a...ages/fig25.jpg

As for the damage, Id recommend gettin it worked on, each time the debris (in theory) runs through the gear it could be damaging the actual gears inside. again, this is just my theory but its the best i got. hope this helps.

Last edited by zmandude6; 14 Jul 2010 at 05:27 pm. Reason: Spelling and adding words for a more clear explanation.
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Old 15 Jul 2010, 12:03 am
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Default Re: Non-rhythmic "clang" when accelerating

that helps a lot, nice description man!

sounds like that little chunk of metal could belong to one of many components. i don't have the bucks to get it looked at, guess i'll live with it unless or until it decides to do more than make some noise...

thanks for your help/advice/info!
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Old 15 Jul 2010, 12:23 pm
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Default Re: Non-rhythmic "clang" when accelerating

No problem, its what the forum is here for. unfortunatly the transmission (if that is the cause) will cost a lot to repair. id start saving up some cash so that it can get looked at. but anyway best of luck.
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