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Where is the O2 sensor on 1993 Toyota Mr2
how to fix speedometer for Toyota mr2
by the oil dip stick
under the hood behind the spare tire.
Problem with the charging system. Most likely the alternator is defective.
Pictures and instructions are found here: http://www.padandwheels.com/mr2/thermostat/thermostat.html
The Toyota mr2
unbolt the negative power wire unplug the positive power wore remove the tension bolt on the top of the alternator remove the lower bolt and pull out the alternator
For MR2 2.2, production years 1991 and 1993 the firing order is (1,3,4,2).For other years I don't know.
see this page for pictures and instructions: http://www.padandwheels.com/mr2/alternator/alternator.html
the Toyota mr2 engine is said to fit but i have to try it out myself first i just bought a 92 paseo
many bad mechanics will put belts on tighter than specs or even ignoring specs thinking that a new belt should stretch which is wrong. Take your mr2 back to them, what you are hearing is the bearings in your alternator screaming bloody murder and from now on only take your mr2 to someone who is experienced with the Toyota mr2, it is an easy car for bad mechanics to screw up