Subject: Re: Secondary emissions air pump replacement procedure Author: mortyk : member since September, 2004 : 403 posts Posted on: 2005-03-01 20:42:45

David,
I replaced mine without removing the front bumper. I went through the wheel housing and removed the fog light for more access. Seems an easier approach than removing the bumper. The only reason I removed it was when the dealer replaced the injectors, they cracked a vacuum line causing the check engine light to come on. They claimed it was the secondary air pump. After replacing it the light still came on. After closer inspection and minus $200 for the pump the vacuum line was discovered to be the culprit. I hear the noise with the new pump. I read that it is supposed to activate after a cold start and remain on for 90 seconds.
Morty K.

• Secondary emissions air pump replacement procedure (pic) (url) - DavidC 2005-03-01 14:37:47 (31639 views)
  • Don't forget to replace the EGR valves, too! (url) - DavidC 2007-04-27 12:48:45 (1220 views)
    • Do I have this on my 97 740il? (nt) - alexe 2009-09-03 16:28:39 (40 views)
  • More info in a followup thread found here. (url) - DavidC 2005-12-09 12:19:44 (1140 views)
  • Re: Secondary emissions air pump replacement procedure - mortyk 2005-03-01 20:42:45 (1205 views)
  • Nice! Any other symptoms like SES, check engine or the like and - Magnum 2005-03-01 16:02:59 (1025 views)
    • There were no other symptoms and the SES light didn't illuminate (yet) - DavidC 2005-03-01 20:49:41 (1104 views)
      • Interesting, because after this post I listened to my car upon start up - Magnum 2005-03-01 21:41:59 (927 views)
        • Yes, a slight noise outside is normal, but not a loud noise that drowns - DavidC 2005-03-01 23:02:43 (845 views)
  • Damn. That's the longest extension I've ever seen! - sealbeach740 2005-03-01 15:39:53 (781 views)
  • Great write up! What is the purpose of this air pump? (nt) - silber98 2005-03-01 14:56:31 (1102 views)
    • Re: Great write up! What is the purpose of this air pump? - jbarton750 2005-03-01 15:46:41 (1316 views)
      • My Volvo has a similar pump... - txdarth 2005-03-01 18:45:50 (910 views)
  • David, do the V-8 4.0 liter have this pump also? - Gary 2005-03-01 14:42:51 (857 views)
    • Re: David, Great Article & Good Job!!! (nt) - HighLine740iL 2005-03-01 18:16:42 (761 views)
      • Re: David, Great Article & Good Job!!! - 81xavieromar 2006-02-28 18:19:11 (487 views)