Results 1 to 12 of 12

Howling at startup?

This is a discussion on Howling at startup? within the External Engine forums, part of the LSx Technical Help Section category; My car's got an intermittant problem. Sometimes, right when you start it up, it will make this loud howling noise. ...

  1. #1
    Teh Combustinator MarkuzLS1's Avatar
    Join Date
    Aug 2005
    Location
    Decatur, AL
    Age
    38
    Posts
    353

    Black
    2002 Trans Am

    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.

  2. #2
    Member
    Join Date
    Sep 2005
    Location
    Pueblo, Colorado
    Posts
    268

    Black
    1998 Pontiac Trans Am

    Probably your A.I.R (air injection reaction) pump.

  3. #3
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
    Posts
    2,725
    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.

  4. #4
    Teh Combustinator MarkuzLS1's Avatar
    Join Date
    Aug 2005
    Location
    Decatur, AL
    Age
    38
    Posts
    353

    Black
    2002 Trans Am

    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.

  5. #5
    Senior Member
    Join Date
    Jul 2005
    Location
    Jacksonville, FL
    Posts
    2,725
    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.

  6. #6
    Member
    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 11:32 PM.

  7. #7
    Member Frosty's Avatar
    Join Date
    Aug 2005
    Location
    Near Philly
    Posts
    338

    White/Silver
    1989 GTA 98 GTP coupe

    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

  8. #8
    Senior Member SeVeReDiStOrTiOn's Avatar
    Join Date
    Aug 2005
    Location
    Roseville, CA
    Posts
    8,164

    05 Wrangler
    00 Z28 sold :-(

    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?

  9. #9
    Senior Member Street Lethal's Avatar
    Join Date
    Aug 2005
    Location
    Old Bridge "Raceway Park" N.J.
    Posts
    1,249
    2009 Corvette ZO6

    Quote Originally Posted by MarkuzLS1
    I have determined that yes, it is the AIR pump. Where is this bastard?
    You've determined that it is in fact the air pump w/out even knowing where to locate it?

    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...

    Quote Originally Posted by SeVeReDiStOrTiOn
    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?
    I thought they howled only when in heat.

  10. #10
    Teh Combustinator MarkuzLS1's Avatar
    Join Date
    Aug 2005
    Location
    Decatur, AL
    Age
    38
    Posts
    353

    Black
    2002 Trans Am

    Quote Originally Posted by Street Lethal View Post
    You've determined that it is in fact the air pump w/out even knowing where to locate it?
    Yeah. I started the car and it was howling. I pulled the AIR Pump fuse and it quit. Put the fuse back in and it started back. Sounds like the AIR Pump to me.

  11. #11
    Senior Member Street Lethal's Avatar
    Join Date
    Aug 2005
    Location
    Old Bridge "Raceway Park" N.J.
    Posts
    1,249
    2009 Corvette ZO6

    Quote Originally Posted by MarkuzLS1 View Post
    I pulled the AIR Pump fuse and it quit. Put the fuse back in and it started back.
    You neglected to mention that...

  12. #12
    Pepe LePew
    Guest
    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!

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Howling coming from rear
    By SMWS6TA in forum General Help
    Replies: 23
    Last Post: 06-10-2011, 10:01 PM
  2. First startup vid after cam swap
    By Ryans99LS1 in forum Multimedia Section
    Replies: 23
    Last Post: 08-21-2009, 12:17 PM
  3. winter startup
    By charlesss in forum General Help
    Replies: 4
    Last Post: 02-03-2007, 09:15 AM
  4. Help. I have not heat at startup?
    By Red97LT1 in forum External Engine
    Replies: 11
    Last Post: 11-19-2006, 04:29 PM
  5. Startup Noise
    By ss~zoso~ss in forum Camaro / SS
    Replies: 8
    Last Post: 12-08-2005, 02:08 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •