Help please, I have a 94 Nissan pick-up with the four cyl. I failed
the nox, I've replaced the O2, checked all vacuums, and EGR system.
The EGR is working at a sharper acceleration, but won't operate at a
steady, say 2000 rpm. Could the backpressure transducer be partially
defective, am I looking at having to replace the converter? I by-
passed the transducer to test the operation, and the EGR valve will
operate at a steady speed. Can an exhaust system lack in back
pressure? No changes have been made to the exhaust and there are no
leaks. We've had the truck for five years and this is the first fail,
even with a check engine light in the previous test. I have since
repaired the check engine light to no help.
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