February 20, 20188 yr Help please. There's a "hole" on the exhaust manifold near the head that looks like it should be for a sensor. I noticed it on the freeway when it must have blown out whatever was mounted in the hole and the car sounded like it had an exhaust leak. The O2 sensor is is downstream from there and attached. What goes in this hole? I apologize if my terms were incorrect or unclear. Any help is appreciated.
February 20, 20188 yr I think you have an EA-81T up pipe on your car. They mount the O2 sensor there. Plug the hole w/a dead sensor or WHY.
February 20, 20188 yr Having owned several turbos, been more than a few years ago, I recall that hole is where the O2 sensor goes. Turbo models only used one sensor so can't explain the second one downstream.
February 21, 20188 yr Author The previous owner did do some funny stuff. I think you all are right. I'll just plug it up. Thanks!
April 7, 20205 yr That hole could have been installed by a previous owner for an air to fuel ratio gauge. Edited April 7, 20205 yr by SiriusBlack
April 7, 20205 yr 2 hours ago, SiriusBlack said: That hole could have been installed by a previous owner for an air to fuel ratio gauge. The EA81T had the o2 sensor in the uppipe, the EA82T has the sensor in the downpipe. Besides those two differences, both the exhaust manifold and the downpipe can be swapped between generations, as long as you are aware of the sensor placement. That is likely what happened here.
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