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Old 11-09-2012, 04:43 PM   #1
CF Senior Member
Member Since: May 2006
Location: Plano TX
Default dull hum noise from exhaust at idle in Park

My '88 is in storage at a friends garage. It's been about 6 months since the car was last started. Car is connected to a Battery Tender and has Stabilze gas treatment in the tank.

Today I went to start it up - started just fine. Throttle had a slight hesitation, so i just let it idle while I cleaned the car up. After letting it idle for about 20 min, I starting hearing an odd hum noise from the rear - and more specifically out the exhaust pipes. Up near the engine all sounded fine.

I let the car idle for about 25 min, so it could warm up, then shut it down. Checked things over - all looked fine. Started the car right up again, and within a few minutes, the hum sound was back.

I didn't drive the car - I hope to tomorrow.

Any ideas what the hum/drone like sound could be?

Some info on the car: 1988 Corvette, auto, all stock, 68K miles. Has the muffler eliminator exhaust system (no mufflers). Has all the cats. Over the years I have always thought the cats may be getting clogged...

Suggestion, comments welcome!

auto_cran is offline   Reply With Quote
Old 11-09-2012, 05:10 PM   #2
CF Senior Member
Member Since: Sep 2001
Location: Glenbeulah Wi

Fuel pump?
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Old 11-09-2012, 05:25 PM   #3
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Member Since: Apr 2011
huh uh-huh

Africanized bees?
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Old 11-09-2012, 06:17 PM   #4
CF Senior Member
Member Since: Mar 2005

Had a similar problem before. The muffler had rusted where the inlet is. Would leak when the metal warmed up and seal as it cooled
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Old 11-09-2012, 06:17 PM
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