[Shotimes] Why does the CE light go on if the gas cap isn't tight on OBD II cars?

[Jim and Debbie Leyden]

I'll give it a shot.
I think (and I could be wrong) that the evaporative emission control puts a
slight negative pressure in the fuel tank in an effort to caputure the
vapors and recover them.
The OBDII cars have more sensors on them than you can even imagine.  When
you went in for an emissions inspection they used to remove your gas cap and
test the cap to see if it were working properly.  Since (at least here in
GA) cars with OBDII supposedly know if your car is working right, all they
have to do is plug into your cars OBDII port and the car will tell the
examiner if it will pass.  So there must be some sort of pressure transducer
on the fuel tank to see what is going on.

Jim
'93 MTX


----- Original Message -----
From: "Paul L Fisher" <sho@paul-fisher.com>
To: "SHOtimes" <shotimes@autox.team.net>; "V8 SHO" <v8sho@v8sho.com>
Sent: Wednesday, January 29, 2003 2:54 PM
Subject: [Shotimes] Why does the CE light go on if the gas cap isn't tight
on OBD II cars?


> Any clue?
>
> Paul L Fisher
> '93 Ford Taurus SHO Crimson Clearcoat ATX 170K Build date 11/18/1992
> - K&N Panel filter, Tokico Struts, Eibach Springs, Dynomax cat-back,
Holley
> 190lph fuel pump, FPS rebuilt ATX, 26mm rear sway bar, Performance-Plus
> Stainless Steel Y-pipe, Delrin sub-frame bushings, Amsoil Series 2000
0W-30
> oil, Amsoil Synthetic ATF.
> Coming soon:
> - GTP control arms, proportioning valve bypass, '96 brake upgrade,
subframe
> connectors, H-box reinforcement.
> '00 Ford Explorer XLT 5.0L V8 AWD Oxford White Clearcoat 41K Build date
> 11/19/1999
> - Amsoil Series 2000 0W-30 oil, K&N Fuel Injection Performance Kit
>
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>
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