MPG, desiring Folks)
no, the,ECU can run perfect because it looks at the ECT sensor. (full time)
this sensor tells the ECU exactly what temperature the engine is operating at
and in fact moves the AFR (air fuel ratios) to a better place in the AFR MAPS and the engine
becomes more efficient. (the beauty of EFI ). EFI = electronic Fuel Injection.
or EMS ,engine managment systems.
To anwer other questioins here.
No, my 91 dont smoke. ever.
yes the sensors are easy to change.
if you can replace a spark plug then you can change any sensor.
see my first link on my sig page for most torques.
IAT, unscrew, put new one in (8v IAT is very important unlike 16v ; Night and day)
ECT, unscrew (coolant drips out a bit ,keep rad cap attached and cold engine)
unscrew it , screw in new one. It is a tapered pipe thread so dont torque it to 100ft lbs.
only like 10 max. (same for spark plugs,never over tighten them ,ever,ever,ever.)
on the very old early kicks these 2 sensors drift , and most drift low with age.
this waste huge amounts of fuel and if it gets too bad the O2 sensor cant compensate.
Bingo driving in Open loop mode and 20mpg. sux.
next the 02, never remove one with out the special tool. < my best advice.
i spray wd40, or the like, on it while still warm not red hot. then when it cools down
it sucks some in (free vacuum at the threads) and then apply the special tool
Harbor freight has one or like $3 , every shop needs one. IMHO.
then thread the leads thru the special tool and then start to get the O2 removed.
do not force it or go too high in CCW troque. maybe 50 ft/bls or so.
put more wd40.or heat it with a trouch and let it cool with wd40.
it WILL come off.
now the new one (see my o2 page) put in the new $50 sensor (oem style is best from bosch) it is special antisieze lube in the box , USE it.
others have the antisieze already applied.
replace the 02 every 100k. for max mpg.
02 = Lambda = Oxysensor = EGO ,,etc. ,or Oxygen sensor.
this above is my 100k + or 15year advanced tune up.
the total cost is $100 (all)
Hint:never work on any ALumnum engine unless you use the torque tables.
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