1999 Toyota Corolla Coasting Hum

1999 TOYOTA COROLLA
Avatar
DAYTONFLYERS
  • MEMBER
  • 1 POST
I drive a '99 toyota corolla that has 78,000 miles. When I take my foot of the gas after accelerating at higher speeds, I hear some sort of humming noice that I have never heard before. It almost sounds like the car is having a difficult time coasting. I brought it into a local gas station and the mechanic said he didnt hear anything. Other have been in my car and have commented on the noise. What could the problem be?
Apr 4, 2006 at 9:12 AM
Advertisement
Avatar
LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
Automatic or standard?? If standard it could be a heat shield on the exhaust side of the engine. If auto look for a loose heat shield on the tranny side. The catalytic converter also has a heat shield that often loosens a bolt producing the same noise. Bang around on the the heat shields and see if you can find the noise. Sometimes they warp with heat and a little hammer modulation will fix the proble. Good Luck
Apr 4, 2006 at 9:22 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.

Suggested Repair

Check for a loose or warped heat shield on the exhaust, transmission, or catalytic converter. Tap the shields to locate the noise, then tighten any loose bolts or reshape a warped shield.

Conversation Summary

The owner of a 1999 Toyota Corolla with 78,000 miles hears a humming noise when lifting off the accelerator at higher speeds, as if the car has trouble coasting. A station mechanic did not hear it, but passengers have. The expert says a loose or heat-warped heat shield may be the cause, on the exhaust side for a manual or the transmission side for an automatic, and also notes the catalytic converter heat shield. They recommend tapping the shields to find the noise and tightening or reshaping the affected shield.

Related Repair Questions

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.

Ask a new question

Frequently Asked Problems for This Vehicle