Evaportive Emissions problem (Full Version)

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Evaportive Emissions problem

  

vfilby -> Evaportive Emissions problem (3/11/2007 11:51:36 AM)

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





  
shnormo -> RE: Evaportive Emissions problem (3/11/2007 12:51:28 PM)

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.

ZX1100F1 -> RE: Evaportive Emissions problem (3/11/2007 1:01:33 PM)

Vince,
With those codes I would suspect a faulty fuel tank pressure sensor with about 99.9% certainty.

vfilby -> RE: Evaportive Emissions problem (3/11/2007 2:16:03 PM)

ZX110F1,

I had the fuel pump and tank replaced about a year ago.  Is the fuel pressure sensor part of the pump/sending unit?

ZX1100F1 -> RE: Evaportive Emissions problem (3/12/2007 7:11:55 PM)

It is attached to the sender assembly but it is a separate serviceable item.Aka: Fuel Vapor Pressure Sensor.

vfilby -> RE: Evaportive Emissions problem (3/15/2007 12:04:09 PM)

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.

RonH -> RE: Evaportive Emissions problem (3/15/2007 2:02:28 PM)

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.

ZX1100F1 -> RE: Evaportive Emissions problem (3/18/2007 10:42:02 AM)

Ron,
That's the ticket, good find.

  

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