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Thread: Howling at startup?
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05-30-2006, 12:23 PM #1
Howling at startup?
My car's got an intermittant problem. Sometimes, right when you start it up, it will make this loud howling noise. It doesn't always make it, but if it does, it's right when you start it up. When the engine revs up some it'll quit but usually comes back when it returns to idle. It'll carry on like this for a minute or two and then just stop. I've tried to tell where the noise is coming from with the hood popped, but can't isolate it. Anybody got any suggestions on figuring this out? Possibilities? Things to try? Any help appreciated.
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05-30-2006, 04:41 PM #2
- Join Date
- Sep 2005
- Location
- Pueblo, Colorado
- Posts
- 268
Black- 1998 Pontiac Trans Am
Probably your A.I.R (air injection reaction) pump.
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05-30-2006, 05:03 PM #3
- Join Date
- Jul 2005
- Location
- Jacksonville, FL
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- 2,723
Could be the pump - try pulling the AIR PUMP fuse under the hood to temporarily disable it - see if it stops making noise. It'll throw an SES light for P0412, but go off by itself after replacing the fuse and 3 cold starts. Pump is on the drivers side front, below the headlight area.
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06-19-2006, 09:51 AM #4
I have determined that yes, it is the AIR pump. Where is this bastard? Is it not belt driven like it was in the old third-gens? Is it possible to just remove the pump? If I decide to replace it, how much is a new one? Somebody help me out.
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06-19-2006, 01:25 PM #5
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- Jul 2005
- Location
- Jacksonville, FL
- Posts
- 2,723
It's not belt driven, electrical. Posted some options in your other post. Lots of people do !AIR, maybe you can find a used one for cheap.
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06-19-2006, 10:19 PM #6
- Join Date
- Sep 2005
- Location
- Pueblo, Colorado
- Posts
- 268
Black- 1998 Pontiac Trans Am
Its possible to take it off but it will throw an SES light (no power loss though). Just make sure to get a block off plate for the exhaust manifold. The pump is on the drivers side near the headlight area. You should be able to get to it from a little access panel in front of the tire.
Last edited by ~redlinels1~; 06-19-2006 at 10:32 PM.
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06-24-2006, 07:35 AM #7
I kept it hooked up after I did my header swap.
I like the noise, I get a WTF look from people at times.
<---dork
-98 GTP Coupe. Silvermist and stock.
-89 GTA*** L98, P1-SC, 24# SVO's, MSD 6-A, March underdrive pulleys, Edelbrock headers/catback and some other goodies.
~Tony
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06-24-2006, 06:21 PM #8
I get the howl now and then....anyone know if that's just from a worn pump or do they howl like that new also?
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06-24-2006, 08:01 PM #9Originally Posted by MarkuzLS1
It can honestly be many things. There are some instances when "spun" cam bearings will howl during cold start, that is, until it's primed with adequate oil to conceal it.
I would simply remove the serpentine belt, and try another cold start. If the sound is no longer prevalent, this will help pinpoint the area in which to look...
Originally Posted by SeVeReDiStOrTiOn
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06-26-2006, 05:01 AM #10
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06-26-2006, 05:13 AM #11
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06-30-2006, 08:45 AM #12Pepe LePewGuest
My AIR pump did the same thing until I replaced the two check valves. They cost me about $10 each at Advanceautoparts.com and took about 20 minutes to install. I don't think I've heard the thing kick on since then...I know it's working, it's just a WHOLE lot quieter!
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