1999 Honda Civic Acceleration Noise

Avatar
REMONKEY
  • MEMBER
  • 1 POST
Honda Civic EX, standard trans., 1999, 103,000 miles.

We had some [i]serious[/i] rain here this weekend. I took the car out on the second day of the rain and whenever I pushed on the accelerator it made a very loud noise - - sort of like there was no muffler attached or I had replaced my beloved Honda engine for a Harley! The acceleration is fine, just LOUD. It has since dried out and the car is still making the weird noise. If I put the car in nutral the sound is completely gone, if I release the accelerator, it lessens but does not leave. I tried travelling with cruise control and the sound was distinctly less.

What could this be??
Apr 24, 2006 at 5:08 AM
Advertisement
Avatar
LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Hot exhaust (catalytic converte)0 PLUS cool rain equals a cracked something in the exhaust, perhaps the exhaust manifold .Good luck!
Apr 24, 2006 at 12:57 PM

Suggested Repair

Inspect the exhaust system, especially the exhaust manifold and catalytic converter, for cracks from hot exhaust meeting cold rain. Repair or replace any cracked exhaust parts.

Conversation Summary

A 1999 Honda Civic became very loud under acceleration after heavy rain, while acceleration itself remained normal. The noise disappeared in neutral, lessened when the accelerator was released, and was quieter with cruise control. The expert attributed it to thermal shock cracking something in the exhaust, possibly the exhaust manifold or catalytic converter area.

Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle