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charlieb71

It looks like the O2 sensor port, but isn't...1987 GL-10 Turbo

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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.

post-70070-0-46955000-1519157863_thumb.jpg

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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.

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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. 

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