Some might have an ses p0446, evap emissions vent circuit low. If you
take it to the dealer they want 300-400.00 to fix the problem. GM has a
service bulletin on this condition and have the updated part for 180.00,
thats suppose to eliminate this issue.
Basically the problem is, the evap purge vent valve gets clogged with
dirt, especially if the truck is used in dirty conditions. Well I
figured there had to be a cheaper way to cure this problem.
Here it is:
1) find the location of the vent valve; its under the truck, locate the
charcoal canister on the front of the gas tank and trace the vent line
to the vent valve.
2) Take the bracket loose with a 5/8 wrench.
3) Spin the valve around so the side with the hole is facing you.
4) Take an air compressor and blow the vent valve out.
5) reinstall and clear the code and it's fixed.
Now I know the updated part from gm is supposed to keep the valve from
clogging ever again, but why spend the money when all you have to do is
blow out the vent valve every 50k-100kmi and save your $$$!
Subject: DTC P0446 (Restricted/Blocked EVAP Vent Path) Set, Service
Engine Soon (SES) Lamp Illuminated (Replace Hose/Evaporative Emission
(EVAP) Canister Vent Asm) #02-06-04-037A - (02/02/2005)
Models:
- 1999-2003 Chevrolet Silverado Models
- 1999-2003 GMC Sierra Models
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This bulletin is being revised to add model years. Please discard Corporate Bulletin Number 02-06-04-037 (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 hose assembly,
resulting in restricted air flow, may cause this condition.
Part Number 15086429 Hose Asm-Evap Emis Cnstr Vent
Removal & Installation
Purge
Solenoid Valve-2.2L (L61) Engine
-
Disconnect the evaporative emission (EVAP) canister purge valve
harness connector.
-
Disconnect the vacuum pipe from the EVAP canister purge valve.
-
Disconnect the purge pipe from the EVAP canister purge valve.
-
Remove the EVAP canister purge valve and bracket.
-
Remove the EVAP canister purge valve from the purge bracket.
-
Inspect for carbon release in the EVAP canister purge valve ports.
To install:
-
Install the EVAP canister purge valve on to the purge bracket.
-
Install the EVAP canister purge valve and bracket. Tighten the
purge bracket nut to 71 inch lbs. (8 Nm).
-
Connect the purge pipe to the EVAP canister purge valve.
-
Connect the vacuum pipe to the EVAP canister purge valve.
-
Connect the EVAP canister purge valve harness connector.
-
Remove the air cleaner outlet resonator.
-
Disconnect the EVAP canister purge valve harness connector.
-
Disconnect the engine purge pipe from the EVAP canister purge
valve.
-
Disconnect the engine vacuum pipe from the EVAP canister purge
valve.
-
Remove the EVAP canister purge valve mounting bracket attaching
bolt.
-
Remove the EVAP canister purge valve along with the mounting
bracket.
-
Installation is the reverse of the removal procedure. Tighten the
bracket bolts to 71 inch lbs. (8 Nm).
Purge Solenoid Valve-2.4L Engines
-
Remove the front purge pipe from the evaporative emission (EVAP)
canister purge valve.
-
Remove the rear purge pipe from the EVAP canister purge valve.
NOTE
The EVAP canister may have released carbon particles, which caused
this part to fail, and may cause damage to other components. Check the
EVAP canister for loose carbon before returning the vehicle to service.
-
Disconnect the EVAP canister purge valve electrical connector.
-
Insert a screwdriver between the EVAP canister purge valve and the
mounting bracket in order to release the lock tab.
-
Remove the EVAP canister purge valve mounting bracket attaching
nut, if replacing the bracket.
-
Remove the bracket.
To install:
-
Install the mounting bracket and the attaching nut for the EVAP
canister purge valve. Tighten the nut to 71 inch lbs. (8 Nm).
-
Slide the EVAP canister purge valve onto the mounting bracket.
Make sure the lock tab locks the valve in place.
-
Connect the EVAP canister purge valve electrical connector.
-
Connect the rear purge pipe to the EVAP canister purge valve.
-
Connect the front purge pipe to the EVAP canister purge valve.
Vent Solenoid Valve-2.2L & 2.4L Engines
-
Raise the vehicle
-
Loosen the EVAP canister vent valve hose clamp and slide the clamp
down the hose away from the EVAP vent valve hose connection.
-
Remove the hose from the EVAP canister vent valve.
-
Remove the EVAP canister vent valve by placing a pry bar between
the valve and mounting surface, and moving the valve forward.
-
Remove the clip from the EVAP canister vent valve harness
connector
-
Disconnect the EVAP canister vent valve harness connector.
To install:
-
Connect the EVAP canister vent valve harness connector
-
Install the clip into the EVAP canister vent valve harness
connector.
-
Install the EVAP canister vent valve by pushing the mounts into
the original holes.
-
Lubricate the hose end with lubricant.
-
Install the hose to the EVAP canister vent valve.
-
Slide the EVAP canister vent valve hose clamp down on to the hose
connection at the EVAP canister vent valve.
-
Lower the vehicle.
Hope this help (remember commetn and rated this).
Does any one know where the solenoid purge valve is located for this same vehiclw
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