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We're just finishing up our 3.4L conversion ('97 single-cat. engine into an '89 4Runner) and I had a quick question about where to position the O2 sensors in the exhaust. The exhaust shop has already installed the 1st sensor just after the cross-over, pretty close to the driver's-side exhaust manifold. Does it matter where the first O2 sensor is located, as long as it's before the cat? They didn't install the second sensor after the cat. because the harness wasn't long enough. Is it OK to cut and lengthen the O2 sensor leads?
I'm going back to get the exhaust finished tomorrow morning and would like to know if we need to move the 1st O2 sensor and/or move the cat.
I'm going back to get the exhaust finished tomorrow morning and would like to know if we need to move the 1st O2 sensor and/or move the cat.