Bosch stopped making this part in 1985, and Porsche has no old stock sitting around. The TDC sensor for the 944 cars looks similar, but it functionally different.

If you have one of these, hang on to it... Its scarcity will ultimately result in a high value when someone with a 924 Carrera needs it and is willing to pay big bucks.

If you have a 924 turbo (81-82), be prepared to throw the car away when this part fails, since there is no substitute.

I suppose that all the 931 owners could petition PAG to make that part available, but there probably isn't enough money to get them to do it...

George = needlessly dire

You aren't wrong, but it's worth it for a car that is driven in terms of reliability, sustainability, and simply keeping these cars on the road. I have about $1200 into my MS build, and that includes a lot of knick-knacks that are optional and tools that a lot of people probably already have. That $1200 is insurance against no-starts (and the towing service), DME problems, harness degradation, reference sensor issues, AFM and distributor removal, speed density tuning, and so much more...

To my knowledge, the 937 and S2 931 were The Only Cars Ever to use the Siemens "Digital Ignition & Timing Control", hence the rarity of the sensor. There has been much speculation over the years about other sensors from other cars that "might" work, but I am not aware of anyone finding one that functions in the same way as the sensor for the DITC unit.

As for petitioning PAG, it's not just this part we should ask them about. There is a growing number of parts for both the 924 and the 931 that are NLA. Simple things like head tensioning sleeves, roll pins for the crank, thermostat bypass hose, motor mounts, and on and on. I have something of a list I've been compiling. George, I would be interested in your perspective on how we might go about banging away at PAG to convince them to start making these parts again. I am quite willing to be the pest and spearhead the effort, I just have no idea where to begin.

As for the original problem, there are a couple of relatively inexpensive options that don't require full MegaSquirt conversion. I'm not knocking MegaSquirt, it has it's place. But I also find it disingenuous when MS enthusiasts profess how cheap and easy it is, because when I look at the forums, I see many many months of trial and error and difficulties getting those systems to work reliably. It's not just the dollar cost, it's the cost in time and effort and misery that is daunting.

If and when my DITC systems fail, and I run out of spares, I will likely be looking at something a little less complicated than MS, like the MegaJoltLiteJr option with EDIS, combined with my trigger wheel setup. There is also this excellent writeup on 924board from a member there who converted using a programmable MSD system.

A good beginning might be an online petition, here at PP, Rennlist, and 924.org... Accumulate a list of names and potential buyers, print it out, explain the problem, and mail it to the CEO of PAG... don't know who that will be, since there is a little problem with management at their parent company right now... :)

That said, making these as a special run might become very expensive, and PAG is not in the habit of losing money on anything.

This looks like it may be the correct waveform for 931? Two coils in series with a super-imposed position trigger:

http://i42.photobucket.com/albums/e3...s.jpg~original

Found a post on 924board where someone got the ignition to work by feeding it a simulated signal.

Great idea. Here's the petition:
Save the 924!

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Standalone?

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You are staring into the NLA abyss on this one...

You are by no means the only one who has this problem.

Put your plea out on the 924Board.org site - more people there who will have this part, and may take pity on you.

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