Dan A Posted June 11, 2009 Report Share Posted June 11, 2009 All 98's have an air pump. The pump is SUPPOSED to run and it sounds like a hair dryer. Sounds perfectly normal to me unless it never shuts off or something. To the OP, unless you actually get the CEL codes pulled, then don't replace anything. To Merch, replace it yourself. Remove the battery tray and the pump is directly underneath. Easy. Link to comment Share on other sites More sharing options...
Olive850 Posted June 11, 2009 Author Report Share Posted June 11, 2009 All 98's have an air pump. The pump is SUPPOSED to run and it sounds like a hair dryer. Sounds perfectly normal to me unless it never shuts off or something. To the OP, unless you actually get the CEL codes pulled, then don't replace anything. To Merch, replace it yourself. Remove the battery tray and the pump is directly underneath. Easy. How about if it comes on like after thrty minutes after I arrive to a destination or comes on randomly at a light?? Link to comment Share on other sites More sharing options...
cn90 Posted June 11, 2009 Report Share Posted June 11, 2009 1. Usually the Air Valve fails causing water to build up in the Air Pump, killing the Air Pump. Personally I'd replace BOTH: Air Valve + Air Pump. - Use only OEM or Pierburg (OEM supplier). - Replace the rubber elbow (between Air Valve and Purple vacuum line) while there. - Use Oetiker clamps (IIRC approx. 7-8 mm in size). Search ebay, you will find seller. 2. Air Pump Info: a- Volvo OEM Air pump is $330. b- 1998 bmw 528i Air pump is $220 but needs minor modifications to work. c- Fix the Air Pump yourself: DIY Instructions: I- To remove Air Pump: Volvospeed.com has info. Basically: * 10-mm wrench for battery terminals * 12-mm socket for battery tray * 12-mm socket for Bracket holding the Air Pump (these 2 bolts holding the Bracket are LONGER than the battery tray bolts. During re-installation, do NOT get confused with battery tray bolts, which I did!!!). II. To dismantle Air Pump for rebuild, follow the instructions by myself http://www.bimmerfest.com/forums/showthread.php?t=332148&highlight=pierburg+rebuild Personally, I would buy a BMW Air Pump for $220 (The Volvo Air Pump is $340) and modify a bit to fit Volvo (just rotate the BMW Air Pump Cap, and re-work the electrical connections). Enjoy the fix. Link to comment Share on other sites More sharing options...
Dan A Posted June 12, 2009 Report Share Posted June 12, 2009 How about if it comes on like after thrty minutes after I arrive to a destination or comes on randomly at a light?? That too is normal. You'll probably hear it come on, say, when you exit a freeway and come to a stop light. It is not only on cold starts, but other situations too. Don't know exactly what all the triggers are, but what you mention is normal operation. Link to comment Share on other sites More sharing options...
850 LongBeach Posted June 12, 2009 Report Share Posted June 12, 2009 SAS for sure Link to comment Share on other sites More sharing options...
Seka99 Posted June 12, 2009 Report Share Posted June 12, 2009 Yes, sounds like the SAS. Mine acts up from time to time usually after coming off the freeway and then coming to a stop. CEL comes on code P401. In any case I've changed the valve and have the solenoid that is attached to the pump ready to be installed. If that doesnt work time for a new pump. Anyhow it only happens once or twice a month so I'm not in a hurry to fix it as I just clear the code with my scanner. The dash removal/repair I'm doing soon is my big concern. Vance Link to comment Share on other sites More sharing options...
Guest tailgunn Posted June 12, 2009 Report Share Posted June 12, 2009 I think I might have something similiar going on. Got the CEL checked at Autozone and it's giving codes p0410 for an air injection system fault and p0505 for idle air controller circut condition. Are these related to the air pump & valve and are the two related to each other? I also get the hairdryer sound but I just though it was the turbo. BTW Chilton's says that just because the air pump is noisy that doesn't mean it's bad. Link to comment Share on other sites More sharing options...
tailgunn Posted June 12, 2009 Report Share Posted June 12, 2009 BTW, I did just replace the o2 sensors and the abs module so I was in there messing around with the intake/hoses/ and what not. It wasn't putting these codes out before that. Link to comment Share on other sites More sharing options...
Guest Merch Posted June 12, 2009 Report Share Posted June 12, 2009 All 98's have an air pump. The pump is SUPPOSED to run and it sounds like a hair dryer. Sounds perfectly normal to me unless it never shuts off or something. To the OP, unless you actually get the CEL codes pulled, then don't replace anything. To Merch, replace it yourself. Remove the battery tray and the pump is directly underneath. Easy. Thanks...I'll get at it Sat morning with a pot of coffee in the garage. Merch Link to comment Share on other sites More sharing options...
Dan A Posted June 12, 2009 Report Share Posted June 12, 2009 BTW, I did just replace the o2 sensors and the abs module so I was in there messing around with the intake/hoses/ and what not. It wasn't putting these codes out before that. If the pump runs, don't replace it. It's only function is to pump air when the ECU tells it to turn on, and the fact that it is running is a good sign. It could still be bad if it is not pumping air like it should, but I would check everything else first. I would start with checking and probably replacing the rubber elbow connections on the hard vacuum lines going to the SAS valve and vacuum solenoid. The solenoid is near the radiator. Not sure on the IAC issue, but it is a common replacement part and not related to the SAS. Could be just coincidence that you are getting both codes at the same time. Link to comment Share on other sites More sharing options...
tailgunn Posted June 12, 2009 Report Share Posted June 12, 2009 Is the SAS valve the valve that is attached to the exhaust manifold and has a big tube the goes up towards the rad and down somewhere? Link to comment Share on other sites More sharing options...
Dan A Posted June 12, 2009 Report Share Posted June 12, 2009 Is the SAS valve the valve that is attached to the exhaust manifold and has a big tube the goes up towards the rad and down somewhere? http://www.ipdusa.com/version.asp?strPageHistory=search&numSearchStartRecord=1&P_ID=3092&CAT_ID=155&V_ID=7103 Yes, that larger tube runs to the air pump. The small line is the vacuum line that goes to the solenoid. Link to comment Share on other sites More sharing options...
tailgunn Posted June 15, 2009 Report Share Posted June 15, 2009 Aha... I hadn't noticed that second line on it because I don't think it's there! I'll have to look again... well that's one more vacuum line missing. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.