Where is the knock sensor on a 1986 mr2 - 1986 Toyota MR2

their were 3 engines for the gen 1 mr2 a 1.5 --1.6---1.6 supercharged
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Try MHHAUTO.com they the best.

Try checking your O2 sensors if you have one that isnot working all the time you will get that reading. If you don't have a computer readout machine take it to an auto zone or another auto parts place they will run the diagnostic tool on your car and tell you what it is as it will give you a code

noway the bearing,s spun right away

Whats the question?

It could be engine detonation or knock. If so it is terribly damaging to the engine and must be totally avoided. Try using premium unleaded petrol for a trial, Or add some "ignition control additive" or ad some Methyl Benzene to the fuel. The anti knock sensor should control this but not all cars had these, or yours may have failed.

This is complicated. You might need to drive to the garage.

If you want a detailed diagram you might need to come on to premium payment mode.

Cheers.

Survey says... yes! 
Also, can you hear the fuel pump?

oil pump is in the oil pan and if you have no or low oil pressure replace pump before doing anything with knock sensor. knock sensor is more or less a microphone and listens for spark knock but will set codes for any knocking or tapping noise which is commonly heard if oil pump is malfunctioning

Check the bushings at the motor for the shift cables, worn or binding. The MR2 club has a link to a company who makes brass replacement bushings.