krburrell

leeham,

I don't know anything about the cut-off valve itself...I can't even see where it is located in the engine bay. I do know that the dealer's retail price is around $70.

leeham

That's well worth looking into. $70 vs. $1200. Anything you can find out would be appreciated. You may have hit the DIY jackpot for all 993 owners.

Don't lift

Does anyone know where this "valve" is located? Also, is there one or two?

Craig,
I would appreciate to know who is your mechanic/shop so I can learn more about this.

Thanks!
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'97 C2S

Richard C2S

Please keep this thread alive and kicking. There are plenty of us who have not had to deal with this problem yet and would be very fortunate to be armed with as much info as possible about this $70 cutoff valve, like what it actually does, where it is located, does the engine have to be dropped to get to it, is there any diagnostic procedure that would confirm, etc. Thank you!

leeham

I propose a test. If anyone can tell me where that "pneumatic switching valve" is located, I'll swap the one from my 14,000 mile car into my 127,000 mile car (with the CEL on), reset the light and see if it comes back on.

Craig MX7

Finally got back to my computer, so now I can upload a few pics of the cut off valve.
LeeH - Not sure exactly where this is located - but I believe its fairly easy to get to- shop only had the car for a day - Probably have to pull the intake tubes out though.
Craig

Howdy993

Interesting to see it is Made in Japan.

Maybe there is a cross reference to a same part for a Honda / Toyota.

Craig MX7

Since OBD II is intended to be universal there's probably a good chance of that. Still, its only $70…
I did just notice the part # is 993 113 245 01 on the box, while its 993 113 245 00 on the valve.

krburrell

The original part was superseded by 993 113 245 01 that's why the difference in part number.

Craig MX7

So, maybe there was a problem with the older version???

krburrell

Either some problem and/or improvement made to the part but only Porsche knows for sure

GratefulJED

It is part of the air injection system according to pet - 00 is up to 96 - o1 is 97 on.

krburrell

I'm not sure which version of PET you have but the version of PET I have only lists the -01 part and the parts list shows the -00 is superseded by -01

leeham

So, does anybody know where it is? I'm ready to try the swap.

rltokar

I am the original owner of a 1996 C4S and it just turned over 40,000 miles. Basically no problems whatsoever with the car since new, and excellent maintenace history. Some autocrosses and track but not much as I have a dedicated 911 race car. This car burns so little oil I am not sure how to quantify it... my guess is 1 quart in 5000 miles.

So my check engine light goes on over the weekend on the highway. Read rennlist archives and then did an appointment with a master factory mechanic today. Got Porsche codes 80 and 208... these are real codes as mentioned by a previous posting. These are the original codes Porsche used and the Federal equivalents that they also now use (for compliance and so smog stations can interpret them) are P1411 and P0410. This is the error for the secondary air injection left side as discussed at length in previous postings. The factory tester is able to test all other errors... trigger the air injection and the cut off valve, look for vacuum leaks, etc. All componets tested fine...

After reset I have driven the car 100 miles and the OEL did not light. My mechanic said he was "sure" it is slight exhaust valve leakage. I guess the oil clogs up the air passages (heated, coking, all that stuff). He said they did a valve job on another 993 and it fixed the problem and it was noticeable when you looked at the heads.

I believe another possibility is an intermitent failure of the SAI switching valve, and I would replace this before I did a valve job. (This valve is clipped to the metal bar just to the left of the fan, has about three wires going to it, and looks like an afterthought which it is!)

The bottom line is the mechanic told me that if this was his car he would not touch the engine. This SAI is a US car feature and it sounds to me like it is overly sensitive and under engineered. He said he would not do the valve job even if Porsche pays the bill... I am still thinking about that but I tend to agree. The car runs perfect, leaks no oil, and does not burn oil so do you tear into it? This may be more of an issue in highly restrictive areas for smog testing... but as I understand it the tail pipe emissions are fine although you need a work around for clearing the fault codes before a test.