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1995 or 1996 engine?
Mike,
Your original posting said 1996 993 engine (which should have OBD2) but your reply said 1995 without OBD2. Since the earlier version 3.6L (1990-1994/5) for the 964 runs with the old air flow sensor with the mechanical flap and not the newer hot-wire mass flow sensor of the 993 and uses completely different software and associated diagnostic tools ($3000+ bosch Hammer versus the $10,000+ KTS500?) I would find out the engine # and acertain which engine you are dealing with. The older engine (964) series # start with 62XWWWW where X is the letter designating the model year and WWWW being the build #. So if X=T (1995), U(1996), V(1997), etc. Also sometime after 1995 the first two numbers 62 became 64 (993 engines).
The Bosch Hammer KTS300/301 can actually actuate each individual injector for you to hear or feel it's operation while it is mounted in the engine, as well as pull out the fault codes that the system ECU stores to tell you what could be the problem. If you need access to one you'll have to buy a reconditioned one from rwmotortec.com for $1500 or go to the local P dealership.
Same problem for the 993 engine but either cheaper or more depending on what you need to find out. There are cheaper software/Palm handheld readers out there to read error codes.
Good luck.
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