What size of engine does a 1986 Toyota MR2 have?

What's a poverty valve? Is that a valve than when it needs fixing, it makes you poor? Just kidding.

burning coolant most likely blown head gasket

Try MHHAUTO.com they the best.

its in the FSM.
or at alldata.com , log in and read. like us.

or at mitchels.

wow, i love MR2, sell it to me.... lust..... sorry.......
USA Car?????????
its sucking fuel, can be lots of things
got the FSM yet?, keeping a very old car like this going without the big book is near impossible...... really... why work blind>?
you got the 4A non turbo engine>?

1.6 L 4A-GE DOHC I4 (AW11)

wiki (USA)
As a power plant, Toyota chose to use the naturally aspirated 4A-GE 1,587 cc inline-four engine, a dual overhead-cam, four-valve-per-cylinder motor.[5] This engine was also equipped with DENSO electronic port fuel injection and a variable intake geometry ("T-VIS"), giving the engine a maximum power output of 112 hp

first what engine then what fuel injection.
Study the Denso system first, then trouble shoot.
If I had this, car i'd :
1: make brakes perfect.
2: fix all fuel leaks, every inch checked,!!!! top reason for midengine car fires...
3: compression on all cylinders (WOT) 150PSI or more.
4: full tune up with all fluids. really !
5: i'd then check all the EFI sensors and have the the injectors pro cleaned off car, (sonic cleaned)
6: engine thermosat holding water temp at 180F or more steady!!!
7: back flush every inch of cooling system and sub parts.

after all that id diagnose it.
starting with fuel pressure tests , all 6 of them.
ask.

TSB's the update MR2 engine signal (spark) generators (sensor)
old ones are no good.
bid away
http://www.ebay.com/itm/1986-Toyota-MR2-Manuals-/181281489430?pt=US_Nonfiction_Book&hash=item2a35380216

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

yes if its in the front but it more like the back one you might just drop the oil pan and do it if you have room to get the iol pan down

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 something that i would call a toyota dealer call them and tell what size your engine is and the year of your car and they can help you with this i am sorry i was not able to help.

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.