This is the third Bosch purge valve I have replaced this year. After a short time they leak. Does anyone else make this valve ?

 

This seems to be a part that rarely needs replacement and is expensive. Have you arrived at this diagnosis by testing the physical valve or just by the OBDC code.
Andy

 

Andy, I have removed each one and used a vacuum pump to see if the hold the vacuum. The first one I bought to replace the original was bad before I even put it on. I took it back and they gave me another one. The second one held the vacuum fine. About 50 miles later the CEL was on again with the same code. I took that one off and sure enough it did not hold a vacuum. So I replaced it. On the way home from the Porsche open house event this September, around 100 miles , the light came on again. Same code P0441.I am open to any suggestion to help with this issue. Thank you .

 

How do you you know the Bosch part is samea as Porsche OEM?
i have seen this on other cars where cheap aftermarket parts don't meet OEM requirements.

if you are convinced that the part is good them the part failure must be a symptom of a different problem. Expand your examination to related parts/systems

 

You may have run into a batch of bad parts made by Bosch however this is unlikely. If you are dealing with a counterfeit part EI a part made by others who fraudulently package them in a Bosch box or simply a third party supplier not branded as Bosch the part may have performance or durability issues. If you purchase a Bosch branded part through an authorized Bosch parts dealer it is an identical service new part to the Bosch part supplied by the dealer in a Porsche box.

You may see a batch number printed on the box or directly on the part. If the replacement parts are not from the same batch and they are genuine Bosch parts you may be looking at other issues within the system that are influencing the durability or function of the part.

After three times at bat I think it is reasonable for you to contact Bosch USA directly to assist you in sorting out the issue including support discussions with a Bosch certified application engineer and sending you fresh parts of known good function for free:

Contact Bosch Page

This is a serious matter for tier-one auto parts suppliers like Bosch, they should be very responsive.
Andy

 

Hi Iain, I don't, I bought them at the Porsche dealer here in Delaware. I asked for a purge valve and that's what I got. Do you have an original OEM part number I could try.

 

They did warranty the part and gave me a new one at no charge. I think you may be right, a quality control issue. These seem to be a simple vacuum switch. Open and close to the carbon canister. At this point I am getting good at removing the heater blower motor, it's right behind it.

 

Do you still have the original part? The number should be molded into it. If not you need to get yourself a copy of the essential Porsche 993 parts catalog.
Which seal fails? Vacuum line or canister vent line?

 

I do not have the original part. But I do have the book and will look it up. Thank You, John

 

Sorry should have been more specific. I was talking about the electronic Porsche parts catalog, not Adrian Streathers book.
the Porsche parts catalog is way more essential

search on the forum and you'll find where to download

 

Do you have access to the OBD manual (WKD-483-420)? To troubleshoot you may need a system tester (Hammer or later or perhaps a third party tester that can control the purge valve), voltmeter, special tool 9160/1 or similar, which it seems you have.

It could be a faulty or leaking canister purge valve but also a blocked fresh air line (seems not likely if you have tested for a leak), a leaking line between EVAP canister and air intake system or the EVAP canister purge valve incorrectly installed (the electric connector must point towards the intake manifold).

Also do you have any other faults?

It would be odd for a dealer to not sell you a Porsche part, at least in my experience. I would check the part to see it it has a Porsche number and/or call the dealer and ask for the part number first.

 

Hi Bob,I don't Know what an OBD manual is . I turned the light off with my FIXD. I am going to drive it for a while and see if the light comes on again. If so I am going to go to a highly recommended Porsche specialist about 45 minutes from me. I am getting uncomfortable with the dealer. Because my car is older they don't seem to want to be bothered. Thanks for getting back to me, I'll get back to you as soon as I have more information to share with you. At my age things just don't get done as quickly as the use too. Later, John

 

Also, you can look for the triangle with stylized 'P' - registered trade mark and sign of genuine Porsche part

 

John, if the light does come back on and you are going to the indie, ask if he has the manual. If not I can copy the section on PO441 and email to you.

 

Bob , I would be very grateful if you would email me a copy from the manual. That way I would have the info I need forl myself. Thank You, John