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Old 10-01-2012, 08:33 AM
Junior Member
Join Date: Oct 2012
Posts: 3
Default Loud motorcycle noise when accelerating

I need some help please. I have a 2000 Honda Civic Ex 2 door with 125,000 miles on it. I was driving on some big hills over the weekend and my car was having trouble getting up them/accelerating while going up them. It was not a huge deal, but suddenly, now my car is making a loud motorcycle noise when I accelerate. It makes a softer motorcycle noise when it is not moving, but it is very loud when ever I accelerate. It is a manual, so each time I shift it is loud when accelerating. I just got a new timing belt last year, and an oil change less than a month ago. The noise seems to be coming from the front more than the back. When I put the car into neutral the sound disappears. The car does not appear to be shaking or slipping - it is driving just fine, the issue is the loud noise. It this the muffler or the engine? What could this be? Any advice or experience would be greatly appreciated.
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Old 10-01-2012, 08:57 AM
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HCF Member
Join Date: May 2008
Posts: 279

Since you're getting reduced power it sounds like you have a restriction in the exhaust, probably at your catalytic converter. There's a honeycomb looking thing in the cat that can get clogged or damaged. Dont let this go for long.
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Old 10-01-2012, 09:38 AM
Junior Member
Join Date: Oct 2012
Posts: 3

Ok, I will get it looked at this week. Thank you so much for your assistance!
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Old 10-01-2012, 09:46 AM
Recognized HCF Member
Join Date: Jun 2007
Posts: 10,023

This could be a hole in an exhaust pipe or even a completely broken pipe. Idle the engine then go and block the tailpipe with a rag. Pressure should build up quietly. If there is no flow from the tailpipe at all, or you hear hissing noises under the car, there is a leak in the exhaust system.
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Old 10-02-2012, 12:03 PM
Junior Member
Join Date: Oct 2012
Posts: 3

Thanks for the advice guys - I really appreciate it. It was looked at today and there is a huge crack in my catalytic converter - so it needs to be replaced. Thanks again for the helpful advice!
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