car seat vibrations

car seat vibrations
Why is my 1997 Honda Civic Ex making loud engine noises when accelerating?

Besides the noise, I can feel the vibration from the driver’s seat. When traveling long distance at about 75mph, the constant noise of the engine is very distracting to our conversation in the car. Please advice.
Thanks honda guy. Okay, it sounds like an unmuffled engine instead of scary rattling or screeching noises. I notice the noise gets louder as the RPM meter rises. Therefore, technically it also gets louder with speed especially when I am accelerating. While cruising at a certain speed/RPM, the engine create constant unmuffled noise depends on what RPM I am at. At 3500rpm/75mph, the noise is loud enough to distract our conversation in the car.

Rev and deceleration by shifting from high gear to low gear will increase the RPM hence creating the noise too. I only feel the vibration when I am accelerating. Thank you.

you really aren’t providing enough information for anyone to be of much help. You have a better chance of our identifying the nature of the noise and the type of vibration by giving us a more thorough desctiption.

Start with this–what does the noise sound like? Does it sound like an unmuffled engine or is it a sound like a knock, a rattle, screech, buzz, drone, hum, tick, clang, groan, whistle or some other word that you can use to describe it?

Does the noise get louder with speed? at what speed does the noise start? At what speed is it loudest? Does it occur on deceleration or only on acceleration? does it happen with the car stopped and running at idle? with the noise get louder if you rev the engine with the car stopped and running in Park or Neutral?

as for the vibration–does it happen on acceleration, coasting, deceleration, or braking? did the noise you hear start when you noticed the vibration or did they happen separately?

you could have a worn (cupped) tire or tires causing the noise and the vibration or you could have two separate problems with every possibility from a leaking exhaust manifold to internal engine problems and tire problems.

by the way, if the car is in the United States and has under 150,000 miles on it then the exhaust manifold and many of the emissions control components are covered under the extended warranty on that year car for 15 years or 150,000 miles.

the more you can tell us the more you can expect to get in return.

hope that helps

RESPONSE
The noise you describe sounds like you have a cracked exhaust manifold. it is very common on the 1997 civics. it is covered by an extended warranty on emissions equipment in the US for that year if you have less than 150,000 miles on the car.

As for the vibration, its tough to say; tire and wheel vibrations will be felt at constant speed such as cruising; if its only on acceleration I would look at the motor mounts or perhaps at the spark plugs or wires as the vibration could be a slight misfire.