Thread: 3FE Pro?
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Old 08-21-2010, 12:55 AM
frontrange frontrange is offline
Hard Core 4+
Join Date: May 2008
Location: Colorado Springs
Posts: 564

IIRC the voltage output across a narrow band O2 will look like a sine wave if the system is working correctly, but that means you have to have a system that is toggling between too rich and too lean and that means you have to have good (not clogged) injectors, right? If that's the case putting a VOM across the O2 won't really tell you anything.

One thing I don't like about the 3FE is there is no service port on the fuel rail for a pressure test guage. I have a nifty Kent-Moore injector test set that will drive the injectors one at a time with a calibrated pulse train. You just pressurize the system with Key-On, Engine Off, get a pressure reading, send the pulse train and read pressure again. Repeat for each injector and if there is a difference in pressure readings on any injector you have a clogged one.

IOT test the Toyota injectors I have to pull them out and put them on a Chevy fuel rail. In a Chevy I can test all 8 injectors in place in less than 5 minutes without getting my hands dirty. I don't know why Toyota skimped on a simple schrader valve for a fuel rail service port.
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