I have a 93 4-Runner w/ 3.0 V6 Manual trans. the check engine light is on for a lean code. the O2 is reading lean & it will not go into open loop. Ive tried a new O2, computer, Traced all wires, Coolant Sensor, cleand MAS air flow meater & I still have the same readings. It will go into closed loop & read rich for a second every once & awhile. The coolant sensor will read -44 or 444f sometimes too. ANY HELP WOULD BE GREAT

 

Greetings,
1st off, don't throw parts at your Toy until your positive that's it, that's just wasting money! Now then let me think it's been awhile, 1st off did you check that your TPS is in adjustment? Recheck your AFM and the wiring! Lets not forget our EGR, everything works together, it's like a guitar if one string is out of tune the whole song won't sound right!
One more thing, did you clear the code after you did all this work? If not that code will stay in the computor, remove one of those battery cables for awhile and clear her out, try it out, the computor has to relearn! You have to watch some of those aftermarket O2 sensors, they can be junk especially those real cheap ones! ANd don't forget the basics: Tuning, Timing...!

10 - 4?