I think that you are talking about the OBD Code P0446, here's the "official" word on the subject. I'm sure this will take care of it for you.
Subject: LR4, LM4, LM7, L59, LQ9, LQ4, L18 DTC P0446 (Restricted/Blocked
EVAP Vent Path) Set, Service Engine Soon (SES) Lamp Illuminated
(Replace Vent Solenoid and Bracket) #04-06-04-055A - (03/20/2006)
Models:
2000-2003 Cadillac Escalade
2002-2003 Cadillac Escalade EXT
2003 Cadillac Escalade ESV
2000-2003 Chevrolet Suburban, Tahoe
2002-2003 Chevrolet Avalanche
2000- 2003 GMC Yukon, Yukon XL
with 4.8L, 5.3L, 6.0L, 8.1L Vortec™ V8 Engine (VINs V, P, T, Z, N, U, G -- RPOs LR4, LM4, LM7, L59, LQ9, LQ4, L18)
--------------------------------------------------------------------------------
This
bulletin is being revised to add updated warranty information and
enhance the content. Please discard Corporate Bulletin Number
04-06-04-055 (Section 06 -- Engine/Propulsion System).
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Condition
Some
customers whose vehicles are operated in dusty type environments, such
as farming or mining off-road type applications, may comment about the
illumination of the instrument panel SES light, with a DTC of P0446 (Restricted/Blocked EVAP Vent Path) being set.
Cause
Dirt and dust intrusion into the EVAP canister vent solenoid, resulting in restricted air flow, may cause this condition.
Correction
DO THIS: Replace the EVAP vent solenoid with a more robust vent solenoid.
DON'T DO THIS: DO NOT Replace the EVAP canister or other EVAP parts.
After following the Service Manual diagnostic P0446
and determining that the EVAP canister vent valve is the cause of the
SES light, replace the existing EVAP canister vent solenoid and
bracket. This new vent solenoid has an enhanced filtering capability
and a filter element that can be easily removed and cleaned. To ensure
correct installation, follow the procedure below.
Raise and suitably support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
Remove the bolt retaining the vent valve bracket.
Disconnect the electrical connector.
Disconnect the canister vent valve hose.
Install the new vent valve bracket, P/N 15105605, to the vehicle with the retaining bolt.
Tighten
Tighten the bracket mounting bolt to 12 N·m (106 lb in).
Install the new vent valve, P/N 10382105, to the bracket.
Reinstall the electrical connector.
Reinstall the canister vent valve hose.
Lower the vehicle.
Clear the DTC.
Parts Information
Part Number
Description
Qty
15105605
Bracket, EVAP Emission Canister Purge
1
10382105
Valve, EVAP Emission Canister Control
1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation
Description
Labor Time
J6441
Valve, Evaporative Emission Canister Vent Solenoid and Bracket - Replace
Use Published Labor Operation Time
GM
bulletins are intended for use by professional technicians, NOT a
"do-it-yourselfer". They are written to inform these technicians of
conditions that may occur on some vehicles, or to provide information
that could assist in the proper service of a vehicle. Properly trained
technicians have the equipment, tools, safety instructions, and
know-how to do a job properly and safely. If a condition is described,
DO NOT assume that the bulletin applies to your vehicle, or that your
vehicle will have that condition. See your GM dealer for information on
whether your vehicle may benefit from the information.
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© Copyright General Motors Corporation. All Rights Reserved.
END QUOTE
Hope helps with this (remember rated this) Good luck.
Have you had your oil changed recently? Sometimes there is an electrical connection around the air cleaner that is not attached.
98 buick lesabre po446 means
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