99 4cyl check engine light?

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Old 01 May 2004, 10:39 pm   #1 (permalink)
Dean
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Default 99 4cyl check engine light?

Code came up "bad evap" or something.

Mechanic reset it and said for starters we'd try a new gas cap. Tried that,
light's back on.

What's next?

44k miles.

Thanks.
Dean


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Old 03 May 2004, 08:47 am   #2 (permalink)
Daniel M. Dreifus
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Default Re: 99 4cyl check engine light?

"Dean" <dean173@yahoo.com> wrote in message news:<P3_kc.46023$2v.43500@nwrdny02.gnilink.net>.. .
> Code came up "bad evap" or something.
>
> Could be bad evaporative canister?

Haynes and factory manuals give test procedure for checking associated vacuum lines.
Should be under the "fuel and emission systems" section.
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Old 03 May 2004, 10:57 am   #3 (permalink)
Jason James
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Default Re: 99 4cyl check engine light?


"Dean" <dean173@yahoo.com> wrote in message
news:P3_kc.46023$2v.43500@nwrdny02.gnilink.net...
> Code came up "bad evap" or something.
>
> Mechanic reset it and said for starters we'd try a new gas cap. Tried

that,
> light's back on.
>
> What's next?
>
> 44k miles.
>
> Thanks.
> Dean


The evap is reference to a canister which lives in the engine bay. Its
function in life is to receive fuel vapours which buildup in the fuel tank.
The engine inlet then sucks them in and burns them during overrun, thus
getting rid of a 'potential enviromental hazard'. The engine inlet provides
the suction needed to make the whole system work and it sounds like there is
a vacuum leak in there somewhere including possibley the fuel-tack filling
cap.

I dont know if you have noticed,..but on a warm day you can often hear a
'shwissssss' noise when you undo the gas-cap? Thats an indication the vapor
recovery system is working well.

Jason


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