03-31-2020, 05:39 AM
btw code 12 does not mean all is hunky dory , bless, it only means sensors not dead.
sensors can be weak are not reported, and just as bad running.
the ECU can get lost too. (means for example O2 sensor lies and can not control) the 02 sensor test are not very good. back then.
the RPM drop can be caused by many things.
Driving with DLC jumpered and code 12 flashing all the time (harmless it is) and then changes to other codes is finding intermittent problems.
when 600rpm happens do you hear the misfire?
ok, a good O2 sensor test, is unplug it, if the 600RPM ends, the 02 is bad.
this car loves to do that, bad 02 and goes rich and engine runs bad rich, even spark plug tips turn black with carbon rich.
removing the 02 plug, causes a trick that causes 02 missing input to go to 0.45vdc this voltage tells ECU fuel mix ok and causes leaner fuel and runs better is possible,.
one more trick 8v.
is remove huge air horn, idle engine now, and have person #1 cut the key as you look down the throttle body air horn, the single injector must stop spraying fuel if not the injector leaks.
a leaking injector can be it or the two 29 year old O-RIngs are cracked on it. super old those are and may be like all full of cracks those rings.
cheers and good luck.
sensors can be weak are not reported, and just as bad running.
the ECU can get lost too. (means for example O2 sensor lies and can not control) the 02 sensor test are not very good. back then.
the RPM drop can be caused by many things.
Driving with DLC jumpered and code 12 flashing all the time (harmless it is) and then changes to other codes is finding intermittent problems.
when 600rpm happens do you hear the misfire?
ok, a good O2 sensor test, is unplug it, if the 600RPM ends, the 02 is bad.
this car loves to do that, bad 02 and goes rich and engine runs bad rich, even spark plug tips turn black with carbon rich.
removing the 02 plug, causes a trick that causes 02 missing input to go to 0.45vdc this voltage tells ECU fuel mix ok and causes leaner fuel and runs better is possible,.
one more trick 8v.
is remove huge air horn, idle engine now, and have person #1 cut the key as you look down the throttle body air horn, the single injector must stop spraying fuel if not the injector leaks.
a leaking injector can be it or the two 29 year old O-RIngs are cracked on it. super old those are and may be like all full of cracks those rings.
cheers and good luck.
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