Evaportive Emissions problem

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Evaportive Emissions problem - 3/11/2007 11:51:36 AM    vfilby   Posts: 9 Joined: 2/6/2007 Status: offline Hi, I have a problem with the evap emissions control system but I don't know where I should start.  I would appreciate any adivce on things to test. The check engine light was going on and off, but now it hsa been on for awhile.  The most recent code is:     P0452 - Evaporative Emissions Control System Pressure Sensor Low Input Perviously it has stored these two codes (taken about 2 weeks earlier):      P0446 Evaporative Emission Control System Vent Control Circuit Malfunction          P0453 Evaporative Emission Control System Pressure Sensor High Input Thanks,Vince Post #: 1

RE: Evaportive Emissions problem - 3/11/2007 12:51:28 PM    shnormo   Posts: 204 Joined: 2/11/2007 Status: offline Doubble check the gas cap, it's the easiest way to go.  Unless you take it somewhere to get it smoke tested, you can't really find the leak yourself. _____________________________ http://www.cardomain.com/id/shnormo05 It's better to burn out than to fade away. (in reply to vfilby) Post #: 2

RE: Evaportive Emissions problem - 3/11/2007 1:01:33 PM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline Vince, With those codes I would suspect a faulty fuel tank pressure sensor with about 99.9% certainty. (in reply to shnormo) Post #: 3

RE: Evaportive Emissions problem - 3/11/2007 2:16:03 PM    vfilby   Posts: 9 Joined: 2/6/2007 Status: offline ZX110F1, I had the fuel pump and tank replaced about a year ago.  Is the fuel pressure sensor part of the pump/sending unit? (in reply to ZX1100F1) Post #: 4

RE: Evaportive Emissions problem - 3/12/2007 7:11:55 PM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline It is attached to the sender assembly but it is a separate serviceable item.Aka: Fuel Vapor Pressure Sensor. (in reply to vfilby) Post #: 5

RE: Evaportive Emissions problem - 3/15/2007 12:04:09 PM    vfilby   Posts: 9 Joined: 2/6/2007 Status: offline Is there anyway to test the sensor before replacing it? I phoned the local chev dealer's parts department and they told me that the sensor was a part of the fuel send unit and was not serviceable, are they pulling my chain?  I have a Chev 1998 C/K Sierra with a 4.3l v6 engine. (in reply to ZX1100F1) Post #: 6

RE: Evaportive Emissions problem - 3/15/2007 2:02:28 PM    RonH   Posts: 415 Joined: 1/31/2007 Status: offline The sensor is part of the sending unit, but it is not in the tank. It's located on top of the fuel pump module and has a wiring connector .  Look on eBay at auction 8043135302.  I think this is the correct sensor for your vehicle. < Message edited by RonH -- 3/15/2007 6:43:31 PM > (in reply to vfilby) Post #: 7

RE: Evaportive Emissions problem - 3/18/2007 10:42:02 AM    ZX1100F1 Posts: 2429 Joined: 8/1/2006 Status: offline Ron, That's the ticket, good find. (in reply to RonH) Post #: 8

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