I recently have been hearing a pulsing tick or clacking from under the hood. What kind of noise does an air pump make when they start going bad? I'm familiar w/ lifter noise and bottom end noise. This not that type of sound. It's too loud to be the injectors clicking.

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'92 firebird t-tops
305tbi,670cfm tbi, 2 1/2" Dynomax catback, 9x3 K&N open element

 

I have the same noise, Thought it was the lifters or injectors but it turns out its my air pump. Don't know what it means but your not alone.

 

I have an air "putting" noise coming from my Air Pump (I believe) It almost sounds like an exhaust manifold leak. I am removing my Smog pump this week. Then I will know for sure.
Later
Mike

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Check out My Car Pics http://albums.photo.epson.com/j/Albu...667&a=13599419

Gran Turismo Americano "The Ultimate Firebird"
Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber) & AC Delco Rapid Fire Plugs

 

That's a good description, "air pushing noise". Seems like a good bet that, that the air pump is the problem.

 

Update>>>>> I removed the pump, and the noise stopped.
Hope this helps

Mike

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Check out My Car Pics http://albums.photo.epson.com/j/Albu...667&a=13599419

Gran Turismo Americano "The Ultimate Firebird"
Smokin 1989 GTA- Bone stock except for exhaust. (no catalytic-stainless pipe into Flowmaster 2 chamber) & AC Delco Rapid Fire Plugs