Need help Evap Vent Solenoid or Purge

[Camo-man]

OK.. I have the infamous P0442 code... New gas cap did not fix..
Do these two parts exist on a 2000 s10 4 cylinder 2 wheel drive?

Are these the right names?

Evap Vent Solenoid
Evap Purge Solenoid

If they are not the right names does anyone know them?
Where are the located on the truck?

thanks.....

[blue92eg]

funny thing is i just got this code so im also gonna replace the gas cap...but i think the solenoids are on the actual canister not 100% tho...ill keep checking this thread for a fix

[tjb406]

one is on the canister above the rear axle the other is under the hood think they both have red connectors.

[Camo-man]

Well I removed the small canister above the axle. I removed it from underside of truck pulled off hose and unplugged electrical connection. I took the lid off and removed the filter, I cleaned filter in hot soapy water, and shot some air through canister. I replaced everything. Week and a half later the light came back on. I guess my next move is Purge Valve?

[truckinjeff]

Purge solenoid is on the right side of the motor under the intake manifold. If you feel your way down the Evap hose you'll feel it. Make sure the hose is connected, it just pushes on to a nipple on the solenoid.

[Camo-man]

That will be my next move....thanks..

Also, I will ditch the stant locking gas cap I got when I first got the error code. and go to a GM dealer and buy stock gas cap.

[Camo-man]

Before I get the purge valve, I went to dealership and bought oem gas cap.
$17.00... putit on let's see what happens now....

[eagle98]

I've got the same problem, 4.3X I'm following this closely.........

[Camo-man]

OK Eagle man,,,,I ditched the stant gas cap purchased new OEM gas cap with tether. I installed new gas cap. I removed positive cable and let truck sit all night, Attached Battery cable , have been driving the truck for 5 days now, no light, but it usually takes about a week.

[Blaine.:.North]

hopfully you guys can get it fixed because i need to fix mine aswel lol

[MikeInCtown]

FWIW, no matter how clean it is, you may still get the code if the little solenoid doesn't work.

I keep getting Evap codes in my 4.3 X and have replaced both the vent valve and purge valve. The one up on the engine may be available through eBay for way less than local. I know when I did mine last spring, I typed in my OEM number and found one on the bay for something like $4. The part under the bed was something like $20. Just picked up a charcoal canister at the boneyard ($7) and will see if that helps. if that doesn't work, next step is paying $70 an hour to someone to test. At least they would not be able to nickel and dime me with parts because I already did it all. Would have to be a cracked hose somewhere.

[Camo-man]

Well Light came back on... So I know its not the gas cap now...
I will try and purchase a purge valve over the holidays... I will keep you posted.

[Camo-man]

small update, I did not purchase the purge valve yet, I opened the hood and I am facing the engine. I followed a vacumn line over from top of the engine to the right side - drivers side fender. This vacumn lines goes in to a "T" valve.
One line goes down and the other line goes to the fender. I felt the line that went down it is about 2- 3 inches long. It was rubbing off in my hand. almost falling apart as I rubbed it. So I replaced that line and reset light. lets see it there may have been a leak. The line was fragile..

[eagle98]

Inventory one gas cap one vaccum splice. Pending........

[Camo-man]

Well light came on today on my way to work..just about right about a week.
I guess I will go for the purge solenoid/valve or replace another vacumn line.
I will post my move.

[Camo-man]

I replace the long vacumn line going from top of manifold to position described in previous post(T- connector). disconnected battery over night to reset SES indicator. Lets roll again.

[banksyboy]

i had this problem and it ended up being a hose to the evap canister leaking. make sure you check the vacums and hoses that lead.

[Camo-man]

banksyboy
Where exactly is this line?

thanks

[hamagc]

i had this problem when my driveshaft broke on me. it broke at the yoke and the shaft came up and hit the purge solenoid. i had to go through the dealer to get the solenoid but i plugged the new one in and problem was solved. good luck!

fyi: the purge solenoid is on the gastank xmember. fat hose goes from the charcol canister to the purge solenoid. small electrical plug plugs into the purge solenoid.

[Camo-man]

OK Light came back on today...GEEZ,,,,hamagc where is the purge solenoid?
Is this the small black box that is bolted to the underside of the truck bed above the axle that has an electrical connection and a hose going to it, also does it have a small filter inside of it? You had this box replaced?

[Camo-man]

I did clean it ,, the filter
if this is the same box. Maybe it is not working properly.

[hamagc]

yes the purge solenoid is the small black box bolted to the gastank xmember. electrical connection running to it, big fat hose running to it. i don't believe there is a filter in it. i do beleive it is just a solenoid to purge the vapors if it needs to.

[eagle98]

I bought the evap solenoid. 4.3x motor, on mine it's under the hood pass side. 40 bucks I'll put it in and see what happens........

[hamagc]

let us know. on the w engine (atlease my last couple trucks) it was on the gastank xmember:


the small box at the bottom of the page.^

[hamagc]

ok after looking at it a bit more, it is the purge solenoid on the gastank xmember. i believe the one on the motor is the egr purge solenoid.

gmpartsdirect has it list for $22.71 for the 4.3.

Mechanical Catalog - 2000 - Chevrolet/Geo - S-10
Emission system, Vapor canister, Purge solenoid, Purge solenoid, 4.3l

i think i paid like $30 at the dealership.

autozone also has it listed for $38.99, part number: PV164

http://www.autozone.com/R,4188309/ve...ductDetail.htm

[eagle98]

went and got the purge valve. 46.00 bucks plus the new gas cap, investment 56 dollars. I went to work today no check engine light yet I will give it a few days.........

[hamagc]

good to hear! let us know what happens

[laydout97]

someone is giving away all these parts in the 2.2 section. I thunk its gutling(sp)

[andyli08]

im a moron

[eagle98]

OK good point, solenoid,purge valve, Mine was under the hood. My 4.3 X motor has that valve though. I changed the solenoid under the hood and it's been two days and NO light. It normally would have gone on by now......... It's a standard part and it was 49.00 bucks........

[hamagc]

sounds like your all set then!

[Camo-man]

ok purge valve solenoid?
the one that is under the hood?
I will pick mine up tomorrow.

Quote: Originally Posted by eagle98

OK good point, solenoid,purge valve, Mine was under the hood. My 4.3 X motor has that valve though. I changed the solenoid under the hood and it's been two days and NO light. It normally would have gone on by now......... It's a standard part and it was 49.00 bucks........

[Camo-man]

Well I checked another vacumn line.
I changed out a vacumn in the earlier post. Well the other part of the 'T' line that goes to the fender well, I replaced. Nothing so far...

[Camo-man]

Well that vacumn did not do it either, light came back on this am. Still takes about a week for the light to come on. I guess its either the purge or vent solenoid next.

[Camo-man]

Well, I spoke to my mechanic buddy, he ordered the solenoid that is above the rear axle. I will put on when it comes in.

[hamagc]

keep us updated

[Camo-man]

Still waiting for the part to come in.

[Camo-man]

Part is in I will pick up tonight and slap it on,,and see what happens...
I believe it is the vent solenoid. It is above the rear axle, Small black box,It has electrical connection and hose connection.

[Camo-man]

Well I put it on last night, reset the light, and I figured it would be about a week before the light comes back on. Light came on after 25 miles. Wonder if I damaged it putting it on or it is working better than the old and there is a problem somewhere else?

[Blaine.:.North]

i have been trying to fix my po440 code for about 2 years now. i just brought it to the shop and they said that my canister is leaking, sending charcoal in all the lines pluging up the selonoids and purge valves making them stick open. So today in autos class im going to look at it myself and go get all new parts besides the lines. they said just blow them out. im just afraid of my injecters geting pluged if they arent already. i only get 18mpg so maybe they arnt "spraying" but just driping fuel? idk but ill post back.

p.s. I bought a new dealership gas cap as well.

[BillsDuster]

I don't know if this will help you guys any, but what the heck if it helps one person then I did good I guess.

Trouble Code: P0442 (2.2L L4 VIN 4 Std)
EVAP System Small Leak (0.040") Detected

Print this code data

Number of Trips to Set Code: 2
OBD II Monitor Type: CCM Details
Indicators: MIL Details

• EVAP Details
• MIL Details

Trouble Code Conditions:
DTC P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0122, P0123, P0452, or P0453 not set, engine started, ECT and IAT sensors from 38-86ºF and within 16ºF at startup, system voltage over 10.0v, BARO sensor more than 75 kPa, vehicle driven to a steady speed of less than 75 mph, fuel level from 15-85%, and the PCM detected the EVAP system Achievad proper vacuum, but a vacuum decay condition was detected in the EVAP leak test.

Possible Causes:

• Charcoal canister is loaded with fuel or moisture
• Fuel filler cap is loose, cross-threaded, damaged or wrong part
• Fuel tank, fuel filler neck or fuel sending unit 'O' ring is leaking
• Fuel tank pressure sensor is damaged, disconnected or it failed
• Fuel tank vapor line(s) is clogged, damaged or disconnected
• Purge valve vapor line is clogged, damaged, or disconnected
• Purge solenoid or Vent solenoid has a small leaking (sticking)
• PCM has failed
• TSB 01-06-04-007A contains a repair procedure for this code

EVAP DETAILS

Monitor Details: EVAP


Evaporative Emission Control System Overview
The Evaporative Emission (EVAP) Control system limits fuel vapors from escaping into the atmosphere. Fuel tank vapors are allowed to move from the fuel tank, due to pressure in the tank, through the vapor pipe, into the EVAP canister. Carbon in the charcoal canister absorbs and stores the fuel vapors.Excess pressure is vented through the vent line and EVAP vent solenoid to the atmosphere. The EVAP canister stores the fuel vapors until the engine is able to use them. At an appropriate time, the PCM commands the EVAP purge solenoid “on”, allowing engine vacuum to be applied to the canister. With the EVAP vent solenoid “off”, fresh air is drawn through the vent solenoid and the vent line to the canister. Fresh air is drawn through the canister, pulling fuel vapors from the carbon. The air/fuel vapor mixture continues through the EVAP purge pipe and EVAP purge solenoid into the intake manifold where it is consumed during combustion. The PCM uses several tests to determine if the EVAP system is leaking.
EVAP System Components
A typical EVAP system consists of the following components: * EVAP Charcoal Canister * EVAP Canister Purge Valve * EVAP Canister Vent Valve * EVAP Service Port (has a green cap) * EVAP Vapor Vent Pipe * Fuel Fill Neck/Fill Cap * Fuel Tank * Rollover Valve with integral Fuel Pressure Sensor (FTP) * Vent Hose/Pipe * EVAP Vapor Pipe
Large Leak Test
The Large Leak diagnostic tests for large leaks and blockages in the EVAP system. With the engine running, the PCM commands the EVAP vent solenoid “on” and commands the EVAP purge solenoid “on”, allowing engine vacuum into the EVAP system. The PCM monitors the fuel tank pressure (FTP) sensor signal to verify that the system is able to reach a predetermined level of vacuum within a set amount of time. Next, the PCM commands the EVAP purge solenoid “off”, to seal the system, and monitors the vacuum level for decay. If the PCM does not detect that the predetermined vacuum level is achieved, or the vacuum decay rate is more than a calibrated level on two consecutive tests, DTC P0455 will be set.
Small Leak Test
If the large leak test passes, the PCM will test for small leaks by continuing to monitor the FTP sensor for a change in FTP sensor signal over a period of time. If the decay rate is more than a calibrated value, the PCM will rerun the test. If the test fails again, a DTC P0442 will be set.
Engine Off Natural Vacuum Test (2002-03 Truck Models <8500 GVW)
The Engine Off Natural Vacuum (EONV) test is the small-leak detection diagnostic for the EVAP system. While previous leak detection methods were performed with the engine running, the EONV diagnostic monitors the EVAP system pressure or vacuum with the key “off”. Because of this design, it may be normal for the PCM to remain active for up to 40 minutes after the engine is turned “off”. This is important to remember when performing a parasitic draw test on vehicles equipped with the EONV test.The EONV utilizes the temperature changes in the fuel tank immediately following a drive cycle to use the naturally occurring vacuum or pressure in the fuel tank. When the vehicle is driven, the temperature rises in the tank. After the vehicle is parked, the temperature in the tank continues to rise for a period of time, and then starts to drop. The EONV test relies on this temperature change and its corresponding pressure change to determine if a leak is present in the EVAP system.The EONV test is designed to detect leaks as small as 0.51 mm (0.020 inches). The test can determine if a small leak is present based on vacuum or pressure readings in the EVAP system. When the system is sealed, a finite amount of pressure or vacuum will be observed. When a 0.51 mm (0.020 inches) leak is present, often little or no pressure or vacuum is observed. If the test fails, DTC P0442 will be set.
Canister Vent Restriction Test
If the EVAP Vent system is restricted, fuel vapors will not be properly purged from the EVAP canister. The PCM tests this possibility as discussed next. The PCM commands the EVAP purge solenoid “on”, commands the EVAP vent solenoid “off”, and monitors the FTP sensor signal for an increase in vacuum. If the vacuum increases more than a calibrated value, DTC P0446 will be set.
Purge Solenoid Leak Test
If the EVAP purge solenoid does not seal properly, fuel vapors could enter the engine at an undesired time, causing driveability concerns. The PCM tests for this possibility as follows. The PCM commands the EVAP purge solenoid “off” and the vent solenoid “on”, to seal the EVAP system, and then monitors the FTP for an increase in vacuum. If the PCM detects that the EVAP system vacuum increases more than a calibrated value, DTC P0496 will be set.
Check Gas Cap Message
The PCM sends a class 2 message to the driver information center (DIC) to illuminate the Check Gas Cap message when any of the following occur: * The Large Leak Test failed due to a malfunction in the EVAP system * The Small Leak Test failed due to a malfunction in the EVAP system
EVAP System Monitor Operation
The EVAP System Monitor is a PCM diagnostic that runs once per trip that monitors the EVAP system in order to detect a loss of system integrity or a leak in the system (leaks that range in size from 0.020" to 0.040" in diameter). It also checks the ability of the EVAP system to flow fuel vapors in the system.The PCM controls the Purge solenoid to open and close the path of vacuum to the canister at off-idle speeds. The PCM monitors changes in the fuel tank pressure (FTP) sensor signal with the EVAP vent valve closed. If the PCM detects the system cannot hold proper vacuum, a trouble code is set and the current engine conditions are stored in Freeze Frame. Refer to the EVAP System Graphic as needed.
EVAP System Graphic

Possible Causes of an EVAP System Failure
* Cracks, leaks or disconnected hoses in the fuel vapor lines, components, plastic connectors or lines * Charcoal canister is damaged or saturated with fuel (due to EVAP vent valve problems) * EVAP service port is leaking * Fuel filler cap (gas cap) is loose or missing * PCM has failed
EVAP Purge Conditions
The PCM purges the canister under these conditions: * After the engine has reached operating temperature * At wide open or part throttle (as long as the engine is not overheated) * The engine can be in open or closed loop Fuel Control in a purge event
MIL Operation, How to Clear History Trouble Codes
If the EVAP Monitor detects a fault during a drive cycle, it will set a pending code and store the current vehicle conditions in Freeze Frame. If it detects the fault for two consecutive trips, the MIL is activated and a code is set. The MIL will remain on for more than one trip, but will go out if conditions that caused the EVAP Monitor to fail do not reappear on three consecutive trips. After the MIL is off, the trouble code will be erased after 40 consecutive trips if the fault does not reappear.
Freeze Frame Data
The PCM stores the current engine operating conditions at the time a trouble code is set in a special portion of memory called Freeze Frame. This important information can help pinpoint the cause of trouble code. It can be retrieved with an OBD II compatible Scan Tool to help diagnose the problem.
EVAP System Repair Verification
An example of how to drive a vehicle to verify the repair of a trouble code related to the EVAP System Monitor on these vehicle applications is shown in the Graphic below.
Repair Verification Graphic

[BillsDuster]

I see there s a sevice bulletin for that code also...




Hope that helps.

[Camo-man]

Light came on but is was P0420
.. Putting on new cat converter. Friday.

[Camo-man]

Well,, knock on wood, I replaced the solenoid above the rear axle, Light came on is was a P0402, cat converter, I had the cat replaced, reset light it has been since Tuesday morning since I have seen the light... hahahha
will keep you posted....

[Blaine.:.North]

well i replaced my canister and my light is gone! so all in all the canister was leaking charcoal, jamming the evap component under the hood on the passanger side. replaced that and the canister and its all done with! sweet....

[Camo-man]

Well I may have to do that , My light came back on last night. I will get the error code to see what it is and post.

[Camo-man]

Had it checked today, The infamous P0442 small evap leak again. Damn

[Camo-man]

Blaine.:.North
How hard is it to change out the Charcoal Canister?

[Blaine.:.North]

not to hard. you just have to take a bold out thats straping the box down and then take out two bolts that you can see just behind the the back wheel on the driver side. Then pull the support out that the box was straped to , then just take of the three connections on the box and reassemble. I went to a junk yard to get a box. $180 new but i got mine for $10 and i got to see how it came of befor doing it on mine lol. All in all it was easy. and still no ses!

[Camo-man]

How do you know if it is Bad?
Do I have to get the Canister off of a 2.2 (that is what mine is), or can I get on off of a bigger engine?

thanks