There is a pull lever behind the drivers seat
Out the bottom of the engine compartment. Here's a link to a series of engine removal pictures: http://www.lovehorsepower.com/images/MR2_EngineRemoval/Removal/Thumbnails.html
It's in the engine compartment on the drivers side. It's a black cylinder.
In the engine compartment, between the battery and the firewall. It's some ways down so its easy to miss if you don't know where to look. Firewall = the devider between the engine compartment and the driver.
Behind the luggage compartment
Can you put a 3.0 engine in an 86 mr2
Carefully push in the plastic grid above the licence plate. Take a long extension on a #12 socket wrench and take off the 2 bolts holding the latch to the body. Open the hood.
I believe the release is in the glove box.
behind the drivers seat you''ll a white or black knob. Pulling the knob will open the engine compartiment
Front bonnet release is to the right of the Accellerator, under the dash and the hood release for the engine compartment is behind the drivers seat below where the seatbelt is fastened.
In automotive terms it would be what you would open to gain access to the engine compartment.
Through the bottom
The firewall is between the engine compartment and the passenger compartment.