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Old 07-06-2015, 04:48 PM   #1
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Evap emission purge valve

I have an 06 Winnebago W24 chassis Chevrolet 8.1. We are attempting to locate the Evaporative purge valve location so we can replace it. I have a replacement part but can't seem to locate the old one. On a Chevrolet pickup it is located by the gas tank, buy my mechanic can't find mine.

Has anybody changed one? Where is the little devil?

Thanks.
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Old 07-06-2015, 05:43 PM   #2
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Stupid Question . . . If you don't know where it is why do you need to replace it??
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Old 07-06-2015, 08:59 PM   #3
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Purge valve is mounted in the intake manifold same as chevy truck. The vent sol is at the gas tank on the chevy truck
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Old 07-07-2015, 09:44 AM   #4
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I did a poor job of explaining my problem. Problem: Check engine light. Scan tool gives a code indicating problem with Evaporative Purge Valve. When I went on line to see about diagnosing it, I found that there are two components. A solenoid on top of the intake manifold and the purge valve itself, located near the gas tank.

The U-tube video shows how to test the solenoid to see if it works. Mine does. I concluded that the valve back by the tank is now working. I ordered one from Workhorse, assuming it was not a standard GM part, which I think it probably is, but I got one from Workhorse just in case.

Now comes the problem of finding that little thing under the motor home, some where by the gas tank. My mechanic says that he rolled around on a creeper and could not find the actual valve anywhere. That was my question. Has anybody replaced one?
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Old 07-07-2015, 10:55 AM   #5
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Again the purge valve is on top of the intake. And I could be wrong but I don't think workhorse even uses a vent sol. The emissions on it is not the same as a truck. What is the codes it is setting?
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Old 07-07-2015, 11:53 AM   #6
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It could be on or near the vapor canister which has several lines to it and some wiring plug ( I think). On mine it is located inboard of the driver side frame rail and forward of the rear axle.
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Old 07-07-2015, 01:10 PM   #7
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Looks like on that chassis the only code in the evap system that will turn on the check engine light is P0443 which is a purge sol control circuit. Is that the code it is setting?
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Old 07-07-2015, 04:51 PM   #8
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Yes. That is the code it is giving: PO443. Would you think that the purge control valve near the tank is not the problem?
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Old 07-07-2015, 05:50 PM   #9
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The one on the intake is the one setting that code
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Old 07-08-2015, 07:50 AM   #10
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We can hear the solenoid on the intake manifold making a clicking noise when it is reset and the ignition is turned on. We therefore assumed that it was operation as intended. I suppose that this type of problem can be either of those components. If he can't find the valve, I'll have him replace the manifold solenoid and see if the light stays off. Thanks.
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Old 07-08-2015, 08:14 AM   #11
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I may be wrong but I don't think it has a sol at the gas tank that code its setting is a circuit code meaning the ecm is seeing something It don't like on that circuit you can get the purge sol at any parts store just ask for one for a 2004 avalanche with 8.1 motor take your old one with you for comparing
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Old 07-08-2015, 08:55 AM   #12
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I assume the gas cap is in place and tested?




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Old 08-04-2015, 07:27 PM   #13
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Here is a followup and a request for input if anybody has had similar problems with the P0443 Code: Evap Purge Valve on a Chev 8.1 chassis, 2006 model Winnebago.

So for we have determined that the only purge valve is the one on top of the intake manifold. Apparently there is not another component located by the gas tank. We have replaced the valve and replaced the gas cap. We still get a check engine light. I talked to a Tech. at Workhorse to determine whether they use a proprietary software for testing their system. They apparently do not and the standard GM readers should work.

I am advised that their must be a vacuum leak in the line that allows the valve to malfunction, or some "gunk" in the system that prevents the proper operation; that is to prevent raw fuel emissions from escaping the fuel delivery lines.

Has any one had experience with this specific problem? Any suggestions on what to try next?
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Old 08-05-2015, 04:31 AM   #14
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That code has nothing to do with vacuum lines, pressure, fuel lines, gas cap,etc... It's a circuit code. Meaning its something in the control of the sol. It's either the ecm, the sol, or wiring. You have already replaced the sol so all that is left is wiring and ecm.
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