20 Most Recent 1986 Toyota MR2 - Page 2 Questions & Answers

here are a couple of quick easy thing to do to isolate what the problem is. if your battery is new and fully charged. then take a set of jumper cables and put one clamp on the negitive post of the battery and its corresponding clamp on the alternator bracket on the motor this will insure that you have a complete ground which you need to ingauge the starter. in dc current the amperage is constant and the voltage is variable. a good ground is needed.
if the charge in your battery is depleted jump the car to get it started. then remove the positive cable from the batteries possitive post if the car stays running then the altinator is charging this illiminates the alternator from being the problem. if the car stays running its good if the car dies then the altinator is bad and needs replaced.
check the wires hooked to the starter to make sure that they are not gounding out on the block or the exaust.

you should be able to do it without taking engine out

The relay should be in the engine compartment near the battery.

U could of got the timing off by one tooth. It does not take much to put it out of time.

I experienced the same symptoms that you described in your post on my 1986 mr2. I originally thought is was a relay or switch so I tested all of them. Every one of them check out functioning properly. After a number of days, I finally traced the problem to a burnt wire that was part of a socket that plugs into a horizontal blue and white panel under the dash on the driver's side just above the fuse block. Apparently the wire had come loose after so many years of bumps and other jarring movement and shorted inside the socket. I cleaned up the socket and wire connector, restripped the wire and put it all back together and made sure the connector was tight on the post. Now it all works pefectly.

Make sure you have a good battery/connections. Make sure you have power down to the starter on the B+ terminal if not replace faulty wire or clean/dirty connectionson ensure connections are tight. While someone turns the key make sure you have power in the S terminal. If power make sure the engine isn't locked up and replace the starter. If no power you may have an issue with the ignition switch circuit (stitch, wiring, fuses....)

noway the bearing,s spun right away

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.

you need a new idle control sencer you can get from most auto spairs shops
hope it works for you
thanks acemasters