I have a very early Carrera Targa (built 8/83). It's fully stock.
I've been experiencing random shut downs on the engine. Problem is sometimes it happens when the car's been sitting for a few days and sometimes after it ran for a while. But generally it gets better after the engine is hot. The idle seems to dip occasionally and sometimes it dips enough to kill the engine completely.
We've done quite a bit of testing with a friend of mine and figured out it's NOT the DME relay (it was still good but I installed a new one anyway) and it's not fuel pressure related as pressure stays constant even after the engine died. 31 pounds while driving (fluctuating), about 36 pounds at idle. The pressure in the line raises to 39lbs right before the shut down occurs indicating injectors have closed up. ICV valve was removed and cleaned and seems to operating properly. So the problem is most likely electrical.
Head temp sensor is an upgraded 2-wire 964 version. I believe it's working ok because the resistance is going up as it should to 1K ohm as the engine was cooling down. O2 sensor looks very recent as well.
Any ideas what else could be shutting down the injectors or any other tests to throw at it? We're a little stumped.
