Plugged converter possibly or other exhaust restriction. exhaust is very very hot, because of this, your exaust manifolds/headers are going to get very very hot, especially if you tend to run high RPMs. if everything else like throttle response is fine, i wouldn't worry
On the exhaust line just behind the area where the 2 manifolds become one but before the catalytic converter. Should have a shroud around it.
No. Way too expensive and soft to be a good choice.
Toyota hiace 82 models such as YH71 (mine) use 3Y engines as do the 4-runner, corolla and hilux. You may find some information in the manuals for these vehicles. As far as I know, there islittle difference in the settings for the 2Y 3Y 4Y and R1Z engines, but don't hold me to that I'm still an amateur.
it is on the exhaust manifold just before the y pipe on the and the manifold meet can't miss it has 2 wires coming out of it and kind of looks like a spark plug on the end
altho not familiar with the 02. The common place for an O2 sensor is on the exhaust manifold prior to the catalytic converter.
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