02-02-2017, 12:03 AM
i agree
code 12, just means no shorted, nor open wires to sensors, it only find totally bad sensors
but is good to know that.
the ECT was 30 degree low the engine would run rich but no codes. huge error, there, but ECU can not know this, no points of refrence to tell you that, so 300 ohms hot, sensor unplugged, key off, is 5min test. and bam, ECT is reading correctly
my ECT page shows, this and even shows volts, and the math to arrive there.
The hot start failures (and floods)
can also be a leaking injector, so ,with the air horn off, key off a running engine, see that injector halt injections in an INSTANT
as it must, with zero power to it now, (keyed off) zero leaks allowed now.
code 12 means not in limphome, but ecu can get lost.
lost means it can't control fuel.
i don't think its lost... (high fuel pressure, or 02 stuck at 0v) total loss is fuel pressure dead wrong, partly lost is 02 dead.
i think the injector leaks or its 2 o-rings cracked, assumes ECT reads 300 ohms and IAT read ok.
The map sensor hose can clog or cracked and engine would like to flood... but 25mph hints that that is not happening.
but I always check the full vacuum path to the map,its the main sensor for fueling.. .
hot starts, use the ISC for air(electric)
the IAC thermal unit in base of the throttle body is closed at 150, and up. so does not provide start up air, ever hot.
but the ISC +bleed ,provides all startup AIR hot, TV is closed,
so if the ISC fails to open , the engine will flood, unless you add 5% more air with your right toe. a good clue this.
Isc can do very add things...
most leak,
but some jam or only under odd conditions. (even dirt in the back side guide sleeve)
keep its mind all cars go super rich cranked if the ECT lies, its buns off. it tell the ecu that you are in alaska, it will flood.
the ect fuel tables are very very accurate, here, In fact this is why EFI runs in all places on earth, Alaska to Death Valley CA.
those magic tables.. for fuel vapor pressure.
code 12, just means no shorted, nor open wires to sensors, it only find totally bad sensors
but is good to know that.
the ECT was 30 degree low the engine would run rich but no codes. huge error, there, but ECU can not know this, no points of refrence to tell you that, so 300 ohms hot, sensor unplugged, key off, is 5min test. and bam, ECT is reading correctly
my ECT page shows, this and even shows volts, and the math to arrive there.
The hot start failures (and floods)
can also be a leaking injector, so ,with the air horn off, key off a running engine, see that injector halt injections in an INSTANT
as it must, with zero power to it now, (keyed off) zero leaks allowed now.
code 12 means not in limphome, but ecu can get lost.
lost means it can't control fuel.
i don't think its lost... (high fuel pressure, or 02 stuck at 0v) total loss is fuel pressure dead wrong, partly lost is 02 dead.
i think the injector leaks or its 2 o-rings cracked, assumes ECT reads 300 ohms and IAT read ok.
The map sensor hose can clog or cracked and engine would like to flood... but 25mph hints that that is not happening.
but I always check the full vacuum path to the map,its the main sensor for fueling.. .
hot starts, use the ISC for air(electric)
the IAC thermal unit in base of the throttle body is closed at 150, and up. so does not provide start up air, ever hot.
but the ISC +bleed ,provides all startup AIR hot, TV is closed,
so if the ISC fails to open , the engine will flood, unless you add 5% more air with your right toe. a good clue this.
Isc can do very add things...
most leak,
but some jam or only under odd conditions. (even dirt in the back side guide sleeve)
keep its mind all cars go super rich cranked if the ECT lies, its buns off. it tell the ecu that you are in alaska, it will flood.
the ect fuel tables are very very accurate, here, In fact this is why EFI runs in all places on earth, Alaska to Death Valley CA.
those magic tables.. for fuel vapor pressure.
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