Noises from the engine - Honda Accord SE - 2000

JAB007

MEMBER
2000 HONDA ACCORD

Make: Honda Accord SE
Year:2000
Mileage: 149000 KM (93125 miles)
Engine Size: 2.4, 4cylinder
Automatic Transmission, 4 Door

I have 2 different noises from my engine:

1. When I accelerate I hear a wheezing/whistling noise from the engine. It is very noticeable during accelaration. It gets louder as I accelerate and weakens but stays, when the transmission shifts. I notice this noise at low speeds.

2. The other noise is a vibration noise at high speeds about 130Km/h (81m/h). It sounds like a vibration/growling/roaring/howling sound. Noise stays as long as the speed is maintained. It feels like something is vibrating violently but I do not feel any significant vibration in the steering wheel to say that the wheels are out of balance. The car does not vibrate. When the speed is reduced to 120Km/h the noise goes away. The noise starts suddenly and goes away suddenly. There is no getting louder or weakening in the noise.
One does not drive at such speeds normally but I have just bought this car and have a 6 month power train engine and transmission warranty. So I test this car under different conditions.
something is vibrating at a certain speed when the engine reaches a certain frequency. I don't know what and how serious it is.

I have tried to be as elaborate as possible so that you can pin point the problem.

Looking forwards to reply.

Thanks.

6 Replies

BRUCE HUNT

MECHANIC
3,754 POSTS

Ok, start with this first. With the engine off and cool, grab the cover over the exhaust manifold and make sure it is secure. There should be 4 bolts on the cover. Make sure they are all there and tight.

Next crawl under the from the front end and check out the exhaust from the engine. On the exhaust pipe there should be a series of heat shields. These get rusty, loose and start to vibrate. There are a few of them. You may have to put the car on ramps to be able to access all of them. If they have any movement at all you need to take action to eliminate the movement. Sometimes a band around the pipe and shield will work. Sometimes you can make new mounting brackets for the shield. They could be taken off but I wouldn't advise it. And of course there is the expensive method of replacing them with new if you are able to find them.

If this does not solve both of the problems, I would look closely at the intake system. You could have a loose air intake tube, bad air filter, or some other loose part on the intake.

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Thursday, June 14th, 2007 AT 11:30 AM

JAB007

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4 POSTS

Thanks for the reply Bruce.

Do you think both the noises ( to me they appear independent) are actually related?

One noise (whistling sound) occurs all the time at low speeds, the other (loud vibrating/brrrrinng/buzzzing noise) only at high speeds.

Can you please tell me where the exhaust manifold is?

It is good that you think it is not something related to transmission/engine.

Thanks again.

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Thursday, June 14th, 2007 AT 11:43 AM

BRUCE HUNT

MECHANIC
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On the 4 cylinders is usually the chrome piece right behind the radiators. It usually has a hot symbol on it as a warning. That is a cover for the exhaust manifold. They put that cover on for two reasons that I know of. One is to reduce the temp when someone is stupid enough to tough it. It is not quite as hot as the metal beneath it. Secondly, it has much better appearance. So it is cosmetically better looking.

The exhaust manifold is beneath it and the cat convertor and exhaust system.

They may or may not be related. Take them one at a time. This one should be easy to detect. ANY movement is a potential rattle. And let me say that the noise can be very deceiving about the location it is coming from.

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Thursday, June 14th, 2007 AT 3:29 PM

JAB007

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4 POSTS

1) Is it possible that the vibrating noise coming from the front is noise of the bearing from the wheels.

2) The whistling noise coimg from the engine can it be the noise from the water-pump. The car has 150,000 Km on it the water pump and timing belt has not been changed yet.

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Tuesday, June 26th, 2007 AT 6:50 AM

BRUCE HUNT

MECHANIC
3,754 POSTS

Anything is possible, but I would think there are other more possible more likely. For instance, checking the belts, checking the bearings on the belt drive systems.

Have you done the check of the exhaust?