Stands for Can't Initiate Speed. Yank it and go aftermarket,
If you have worked with older European cars, then you have likely encountered Bosch CIS injection. It was fairly prevalent back in the ’70s and ’80s on cars from VW, BMW, Audi, Porsche, Mercedes-Benz, Volvo, Saab and even Ferrari.
The Callaway turbocharged VW Rabbit GTI that we’re doing over at Classic Motorsports is so blessed. When we bought the car, it was a non-runner. To get it back online, we had to dive into the CIS system.
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Stands for Can't Initiate Speed. Yank it and go aftermarket,
porschenut said:Stands for Can't Initiate Speed. Yank it and go aftermarket,
I went MegaSquirt on my Porsche 924 and never looked back. If you read the 924 groups and forums, you'll see how many are sidelined due to CIS issues of one form or another.
The Cis is cleverly designed, simple and reliable. But it works best in the simpler cis basic we got here without lambda control etc. But a barn find car can be some hassöe to get up and running, they work best if used sometime. Read first before you fiddle and it will save you alot of time and money :)
Running about 240+hp in my 924 turbo with stock CIS, love efi system but not in this car :)
In reply to Cedricn :
Mine WAS working, it drove the car home from Bellingham to Portland about 300 miles on 3 cylinders.
It was running on 3 because the exhaust manifold cracked and one of the exhaust valves partially shattered.
It also had no working alternator.
When I went to start pulling the head, the banjo fittings at the injectors all broke (even while being supported properly), so that was the end of that for CIS.
Moving to EFI freed up a ton of space under the hood and made diagnosis much easier.
Modern fuels in North America really don't like to sit, especially in carbs and CIS systems. They seem to gum up (likely some of the additives used) and that causes a lot of issues that aren't easy to sort without essentially rebuilding it all.
Lol. Just Lol. First time back here in forever and David is talking about CIS. That makes me feel comforted beyond belief. Can't wait to read the article even tho I already pretty much know how it's gonna end! 
CIS works incredibly well when it hasn't been screwed with. Rather like a Quadrajet.
I'll take CIS-E over anything with a warmup regulator any day. It just works. The only time I ever had issues with CIS-E were related to brittle corroded wiring in places, and bad exhaust leaks due to 6 of 10 manifold studs being broken/missing, so the O2 was wildly incorrect. Solution for that was a zip tie on the WOT switch 
I'm going EFI on my Audi engine because the fuel distributors have a roughly 300hp limit, and the air valve's restriction poses a roughly 10 percent power loss.
In reply to angusmf :
Welcome back!! It's been a while. Hope that all is well. And I had CIS on my GTI, but that was a few years/decades ago.
Fresh gasoline and fuel filters, no vacuum leaks, and a stock motor that hasn't sat, unmoved for over a year, and K-jetronic is lovely.
I very occasionally get to drive an old Kjet 240 Volvo, and they just run correctly.
I spent way too much time making my rabbit cis happy with 13:1 static compression. Also fun that now it's an interference engine, ask me how I know. Now runs like a strong 1.8 16v in an 1850 lb car.
In reply to 84FSP :
20v pistons with an 8v head?
I acquired a '98 reciprocating assembly to do just that.
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