Honda Engine Makes Rattle at 30mph

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Al Franz - 28 Jun 2005 01:54 GMT

Have a Honda Accord V6 2001. Engine makes a rattle sound when you
accelerate to around 30 mph, as you go faster it goes away. Most noticable
when going up hill and pressing the gas, it does not make a noise when
coasting. Any ideas on what this could be?

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RickaTTic - 28 Jun 2005 02:32 GMT

I have a CRV 4 cyl 2001 doing just about the same thing. It happens
at 2300rpm and sounds like it is coming from beneath the car. A loud
rattling at 30, and 55mph when the engine rpm is 2300. Honda dealer
hears it and cannot locate the source. It's very annoying. If your
mechanic finds it please let me know.
Thanks
Rick

>Have a Honda Accord V6 2001. Engine makes a rattle sound when you
>accelerate to around 30 mph, as you go faster it goes away. Most noticable
>when going up hill and pressing the gas, it does not make a noise when
>coasting. Any ideas on what this could be?

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Jim Yanik - 28 Jun 2005 14:20 GMT

> I have a CRV 4 cyl 2001 doing just about the same thing. It happens
> at 2300rpm and sounds like it is coming from beneath the car. A loud
[quoted text clipped - 3 lines]
> Thanks
> Rick

Either loose(cracked or rusted) heat shields or a cracked A-pipe
weld(IIRC,it's a double walled pipe,the inner weld,of course),the pipe from
the header to the catalytic converter.Some of the heat shields can be
unbolted and removed.(just don't park in tall grass;fire hazard)

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Jim Yanik
jyanik
at
kua.net

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Brian Stell - 28 Jun 2005 05:47 GMT

> Have a Honda Accord V6 2001. Engine makes a rattle sound when you
> accelerate to around 30 mph, as you go faster it goes away. Most noticable
> when going up hill and pressing the gas, it does not make a noise when
> coasting. Any ideas on what this could be?

Sounds exactly like knocking or pre-ignition, AKA pinging.

Simplest fix may be higher octane fuel.

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Jim Yanik - 28 Jun 2005 14:21 GMT

>> Have a Honda Accord V6 2001. Engine makes a rattle sound when you
>> accelerate to around 30 mph, as you go faster it goes away. Most
[quoted text clipped - 4 lines]
>
> Simplest fix may be higher octane fuel.

If he's using the correct octane,he may have a ignition timing
problem,advanced or retarded.

Or a loose heat shield.

Signature

Jim Yanik
jyanik
at
kua.net

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Brian Stell - 28 Jun 2005 16:44 GMT

>>>Have a Honda Accord V6 2001. Engine makes a rattle sound when you
>>>accelerate to around 30 mph, as you go faster it goes away. Most
>>>noticable when going up hill and pressing the gas, it does not make a
>>>noise when coasting. Any ideas on what this could be?

...

> Or a loose heat shield.

Yes, it could be a sympathetic vibration rattle but
there are several things here that make it sound more
like pinging than a vibrating part:

The noise appears "when you accelerate to 30" as
opposed to "at ... mph when the engine rpm is ...".

and

"Most noticable when going up hill and pressing the gas".

I'm not sure about the 6th gen accord but I know 7th gen
has a knock sensor. Supposedly, when there is pinging it
detects it and the engine control system should retard the
ignition (but my 2005 v6 pings under similar conditions).

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Pedro - 18 Jul 2005 17:20 GMT

i had something similar with my s2000. is it a constant vibration kinda like a really loud wwwwaaaaaaaaa? if it is i'll bet its your clutch. mine was. the 4 springs get loose and at certain engine levels i.e about 2-3k rpm and make a proper dodgy sound. don't go to your dealer just go to a decent transmission place and get them to take out your clutch(shouldn't cost much-about £70 in the uk). then if u give the pressure plate a shake you'll hear the springs loosely rattling around, if thats what happens just get a new clutch put in and hey presto. it sounds as loud as it is because the gear box casing acts like a bell housing and amplifies the sound. hope this helps

--
Pedro

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Pedro - 18 Jul 2005 17:21 GMT

ps. reason i think it could be that is cos of the heat shield suggestions because until i solved my problem thats what the garages kept suggesting to me

--
Pedro

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