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Old 09-14-2007, 11:09 PM   #1
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Strange noise coming from the engine bay
My car started making a ticking sound a few days ago. I think it could be the alternator or the smog pump bearings (or whatever is under the alternator). The sound changes volume randomly. It occurs all the time. Check out this video and let me know what you think the noise is:

http://www.youtube.com/watch?v=QcxfuOh-vro
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Old 09-15-2007, 04:11 AM   #2
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Re: Strange noise coming from the engine bay
Kinda hard to make out the exact noise you are reffering to but I would start by checking the all the pulleys to see if any are loose or maybe bent causing what I heard. Sorry I cant be more helpful.
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Old 09-15-2007, 09:02 AM   #3
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Sort of sounds like the A.I.R. pump. Take the belt off of it and start up the engine. If the noise goes away, it's the A.I.R. pump. If it doesn't, take off the next belt and see if it goes away. If it does, it's one of the accessories run by that belt. Etc., etc.
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Old 09-15-2007, 09:21 AM   #4
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Re: Strange noise coming from the engine bay
Sounds like the air pump
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Old 09-15-2007, 02:30 PM   #5
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Re: Strange noise coming from the engine bay
Thanks, ill try out your suggestions.
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Old 09-21-2007, 12:12 AM   #6
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Re: Strange noise coming from the engine bay
Yup, it was the A.I.R. pump. I tried turning it by hand and it would stick at certain points, scraping against the casing I guess.

Replacement set me back $50. Could I have just removed the belt and put it back on for inspection next year? How much would not having the AIR pump operating properly affect drivability?
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Old 09-21-2007, 01:25 AM   #7
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If you just took the belt off, most likely the pump would have seized within days. Quite often when the pump has gone bad, the check valves have as well. If the pump isn't running, exhaust is going to back-flow into the pump and rust it up.

Not having the pump running will not affect driveability.
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Old 09-21-2007, 01:25 AM
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