2000 GMC SIERRA EMISSIONS FAILED

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clemert@gmail.com - 15 Oct 2006 17:19 GMT

MY "SERVICE ENGINE SOON" LIGHT HAS BEEN ON FOR AROUND THREE YEARS
(TAPED A ST. ANTHONY MEDAL OVER IT) AND TRUCK HAS BEEN RUNNING PERFECT.
THREE YEARS AGO I DID HAVE TEST RUN AND MECHANIC SAID SOMETHING WITH
THE GAS CAP, HOWEVER, HE COULD NOT GET THE LIGHT TO GO OFF. FAST
FORWARD, FLUNKED TEST BECAUSE OF CODES "PO440, EVAPORATIVE EMISSION
SYSTEM" AND "PO449, EVAPORATIVE EMISSION SYSTEM VENT VALVE/SOLENOID
CIRCUIT". BOUGHT GAS CAP, REPLACED VALVE CIRCUIT, THE LIGHT REFUSED TO
GO OFF. THREE DIFFERENT PLACES TRIED TO USE THE LITTLE PLUG IN THINGS
BUT THEY WOULD NOT TURN ON TO RESET COMPUTER. I WENT BACK TO EMISSIONS
PLACE AND THEY REDID TEST SAME CODES, THEY SAID TO GO TO DEALER AND
HAVE THEM RESET CODES, DEALER SAID THAT THE TRUCK DOES IT WITHIN 100
MILES AND TRUCK LIGHT WILL GO OFF. DROVE OVER 100MILES AND LIGHT STILL
ON, I HAVE TO TAKE BACK TO MECHANIC WHO RAN OUT OF TIME AFTER TWO HOURS
OF CHECKING FUSES AND STUFF. ANY HELP PLEASE, SINCE MECHANIC CHARGES
BY THE HOUR..

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Advocate - 15 Oct 2006 19:11 GMT

> MY "SERVICE ENGINE SOON" LIGHT HAS BEEN ON FOR AROUND THREE YEARS
> (TAPED A ST. ANTHONY MEDAL OVER IT) AND TRUCK HAS BEEN RUNNING PERFECT.
[quoted text clipped - 11 lines]
> OF CHECKING FUSES AND STUFF. ANY HELP PLEASE, SINCE MECHANIC CHARGES
> BY THE HOUR..

Let me guess...every time you fill the fuel tank, you try and get every last
drop you can in the vehicle...after the gas hose stops, you slowly add as
much as you can until it's at the top of the filler tank.

You aren't the only person that does this...but it causes raw gas to get
into your evaporative cannister where only fumes are supposed to go.
Gasoline in the emission can screws up the system.

Secondly, please don't use all caps when you type...It's irritating to read.

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clemert@gmail.com - 15 Oct 2006 19:31 GMT

Wow! You know me! Sorry about all caps but I really wanted to be
noticed. I now wish I would have made a point to drive by the emissions
checker like I did in the past three yearsw (light has been on that
long) to renew my plates because I really think my problem is that the
light won't shut off. As far as gas in the evaparative cannister when
they changed that part (they did this) they should have been able to
reset the light but could not. They wanted me to ask emission place to
hook up the tail pipe but they said dept of natural resourses does not
allow on a 2000. I have already been issued a ticket for expired plates
and can't afford another. Help

> > MY "SERVICE ENGINE SOON" LIGHT HAS BEEN ON FOR AROUND THREE YEARS
> > (TAPED A ST. ANTHONY MEDAL OVER IT) AND TRUCK HAS BEEN RUNNING PERFECT.
[quoted text clipped - 21 lines]
>
> Secondly, please don't use all caps when you type...It's irritating to read.

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Shep - 15 Oct 2006 19:50 GMT

There is a leak somewhere in the evap system that has to be traced down,
modern technology now uses a smoke machine to check all the evap components
for leaks or non operating valves/solenoids, only way to fix the problem ,
resetting the pcm accomplishes nothing.

> Wow! You know me! Sorry about all caps but I really wanted to be
> noticed. I now wish I would have made a point to drive by the emissions
[quoted text clipped - 33 lines]
>> Secondly, please don't use all caps when you type...It's irritating to
>> read.

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clemert@gmail.com - 15 Oct 2006 21:12 GMT

Thanks so much, Would you have spent 2 hours checking fuses, replacing
that part and trying tor reset because this mechanic charges by the
hour. Is ninety dollars an hour the going rate? I don't have alot of
money and wondering how much this could cost. Thanks for replying. Have
you heard of this problem in a 2000 truck, I do make sure I turn the
truck off when I fill and put the cap on tight.

> There is a leak somewhere in the evap system that has to be traced down,
> modern technology now uses a smoke machine to check all the evap components
[quoted text clipped - 41 lines]
> http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
> ----= East and West-Coast Server Farms - Total Privacy via Encryption =----

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Shep - 16 Oct 2006 01:42 GMT

The going rate is high for upstate NY, but the rate means nothing if the
shop doesn't have the equipment and backround to fix this.

> Thanks so much, Would you have spent 2 hours checking fuses, replacing
> that part and trying tor reset because this mechanic charges by the
[quoted text clipped - 62 lines]
>> ----= East and West-Coast Server Farms - Total Privacy via Encryption
>> =----

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GERALD FISK - 16 Oct 2006 21:30 GMT

To check for EVAP leaks there will be a light green colored cap with
hoses connecting up to it, they are typically no larger than quarter
inch in size and some vehicles will have multiple test ports of this
type. This is the location or connecting port if you will where
smoke/vapor and or vacuum is applied to the EVAP system, if a leak is
suspected via code on the diagnostic computer then in some cases low
vacuum is applied and has to maintain a certain level for a period of
time. If a leak is detected then a tool that generates smoke/vapor "NON
FLAMBLE" is pumped in at low pressure and you will quickly find the
leak,some shops just jump right to this step and skip the vacuum, its
well worth the shop charge since most mechanics using the tools of this
type and training ASE certified should find and fix the leak within an
hour or so plus parts....hehe. A competent NEW car dealership shop
should have this equipment on hand since it is a common problem now a
days. And if it cant be fixed just shoot it! :-)

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