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I finally got my CIS fuel injection test hooked up and was able to take some measurements. System pressure was 74 psi, control pressure (at 36F) was about 15 psi (with power to the WUR disconnected). I connected the WUR, and control pressure ramped up slowly to about 50 psi after about five minutes. Looks like the WUR is doing it's thing correctly. Also, the residual pressure held about 20 psi for over 30 minutes, so that's well within spec also.
I let the car sit over night. With the pressure gauge still connected, residual pressure was down to 0, air temp was a cool 26F. I had my wife start the car so I could watch the control pressure while the car rough idled, but instead, it started up and ran just fine. Fired up, and went right to a 1900 rpm idle and then slowly idled down to 900 rpm.
I guess connecting the pressure gauge fixed it???? I'm thinking maybe I had some debri either in the WUR or in the fuel distributor that maybe came loose. I'm going to try this a few more times before I disconnect the pressure gauge.
Any ideas?
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Bill Krause
'79 911SC Euro
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