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Pressures and O2 sensor
Posted by JEM (more from JEM) on Wed, 23 Feb 2005 17:32:30
In Reply to: No Pressure gauge available., Rmc, Wed, 23 Feb 2005 14:43:32
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First off, I observed exactly the same behavior in my '92 9000T some weeks back.
I had changed the O2 sensor - using a 3-wire Bosch sensor specced for Ford applications ('89-95 SHOs, late '80s-early '90s 5-liter Mustangs, etc.) The Ford sensor is exactly the same part as the Saab sensor, but it has a ~12in pigtail with a Ford connector on it. I cut the wire off the Saab O2 sensor and spliced a Ford mating connector onto the end. But I got the heater (white) wires reversed from the original orientation. Ran pig-rich at all RPMs, sooted the plugs, idled like a rusty Briggs and Stratton.
Pulled the stuffer-block out of the Ford connector, swapped the white-wire pins around, put it back together, and it ran perfectly. Everyone tells me that polarity shouldn't matter on the heater wires, but it certainly did in this case. I never measured the voltage at the O2 sensor, but I have a second bung in the downpipe and had my wideband O2 sensor setup in there, and was able to watch it go full-rich.
Now, that said, if your O2 sensor is reporting rich and the ECU isn't able to command it leaner, then that's not likely your problem, and I'd be very suspicious of trying to troubleshoot further without a gauge to test the running fuel pressure. You're getting manifold vacuum/pressure at the fuel pressure regulator, right?
posted by 209.172.122...
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