11-17-2015, 01:09 AM
that link is a bottomless topic, i have like 100's of old issues of the mag, in my library. one of those pubs, even on EFI testing....
teaches how to test sensor, and to make simulated sensors,,,, (even maf or map , )
no, just saying diagnosing NON oBD2 cars, takes lots of time and money and a shop with tools to do all tests by hand, 1 by 1,
no, sorry the MPGuino works on any car with 1 or more injector (electric)
all it does is take injector pulse-width (measures it in real time ) and speed, VSS sensor. and calculated, MPG. it's just 2 inputs. a tiny processor and some simple code. (and a scaling factor for your car) the scaling factor is (the flow rates of you injector) FUEL Flow rates and speed, = MPG.
It is a very simple device, you can even read the programming code, and learn that. (a very in demand skill that)
On modern cars, we have this data in OBD2 streaming data. sets.. your car does not have this feature, (but we can scan PIDS 1 by 1)
so, the maker of the MPGuno , solved that,,, the hard way, the same hard way that all tech. know , about OBD1.
measuring all sensors by hand, or worse while driving, (imaging, distracted driving and accidents) so is done with 2 persons, 1 driving one doing measurements.
nobody takes a old car and upgrades to 0BD2
working on OBD1 cars, is not easy , ever. (unless we have the luck of he Irish)?
A real scan tool can be had, if you want to save all that hard work....
case in point, what if the 02 Closed loop is dead..???
case2: what if the ECU gets lost, while injection (obd1 has no, IM lost. DTC ,like OBD2 has)
by lost I mean , the ECU has no full control or injection rates. and is guessing, or hunting endlessly to do that.
The ECU has no redundant sensor, so must trust them 100% (it does , dead sensors , im talking accurate sensors that are not biased)
the ECU reads a sensor and if its , not open or shorted, believes it.
this is where a scan tool Shines.
The human looks at the data and sees, omg, that it totally wrong,
say ECT reads -10f when its really 50F..... see how humans are 100x smarter than any ECU on earth??
same with the MAP or MAF, and IAT, and 02.
same with fuel trim.
and all data in to the ECU.
no scope
no duty meter.
no mpg gauge.(to solve mpg problems )
no scan tool.
this is called working blind...... and all results will be hard earned if at all.
teaches how to test sensor, and to make simulated sensors,,,, (even maf or map , )
no, just saying diagnosing NON oBD2 cars, takes lots of time and money and a shop with tools to do all tests by hand, 1 by 1,
no, sorry the MPGuino works on any car with 1 or more injector (electric)
all it does is take injector pulse-width (measures it in real time ) and speed, VSS sensor. and calculated, MPG. it's just 2 inputs. a tiny processor and some simple code. (and a scaling factor for your car) the scaling factor is (the flow rates of you injector) FUEL Flow rates and speed, = MPG.
It is a very simple device, you can even read the programming code, and learn that. (a very in demand skill that)
On modern cars, we have this data in OBD2 streaming data. sets.. your car does not have this feature, (but we can scan PIDS 1 by 1)
so, the maker of the MPGuno , solved that,,, the hard way, the same hard way that all tech. know , about OBD1.
measuring all sensors by hand, or worse while driving, (imaging, distracted driving and accidents) so is done with 2 persons, 1 driving one doing measurements.
nobody takes a old car and upgrades to 0BD2
working on OBD1 cars, is not easy , ever. (unless we have the luck of he Irish)?
A real scan tool can be had, if you want to save all that hard work....
case in point, what if the 02 Closed loop is dead..???
case2: what if the ECU gets lost, while injection (obd1 has no, IM lost. DTC ,like OBD2 has)
by lost I mean , the ECU has no full control or injection rates. and is guessing, or hunting endlessly to do that.
The ECU has no redundant sensor, so must trust them 100% (it does , dead sensors , im talking accurate sensors that are not biased)
the ECU reads a sensor and if its , not open or shorted, believes it.
this is where a scan tool Shines.
The human looks at the data and sees, omg, that it totally wrong,
say ECT reads -10f when its really 50F..... see how humans are 100x smarter than any ECU on earth??
same with the MAP or MAF, and IAT, and 02.
same with fuel trim.
and all data in to the ECU.
no scope
no duty meter.
no mpg gauge.(to solve mpg problems )
no scan tool.
this is called working blind...... and all results will be hard earned if at all.
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