I put my jimmy into lots of things in high school, but never put anything into my jimmy
...been driving a 1994 S-15 Jimmy 4.3L for the last 9 years, and loving it... luckily no major engine troubles except for that damn EGR valve...
I put my jimmy into lots of things in high school, but never put anything into my jimmy
...been driving a 1994 S-15 Jimmy 4.3L for the last 9 years, and loving it... luckily no major engine troubles except for that damn EGR valve...
No, it's about this guy spreading bullshit that he obviously knows less about than he thinks he does. I just believe that if you're going to give someone advice, it should be accurate facts, and not opinions or what he thinks.
Originally posted by: Evadman
Keep in mind, this was in '96, but I will try to remember as best I can
So was it a carbuerator or f.i.? Never heard of a 2 bbl fuel injector, unless you're talking about a throttle body fuel injector, but that's not a 2 bbl? If you can't get your terms right, how can we expect to take you seriously?
I asked about the wiring harness because a 2.8 harness and computer is not directly compatible with another engine, that's all, what did you do to make them work? My point is you gave him advice to swap it out with another engine and you made it all sound so simple. Give the man good advice, not bullshit that you'd like to do with your truck.
That's pretty damn close to what I said. Adding or subtracting voltage is resistance. Admit you're wrong and quit posting bullshit Evadman.
Uh, guys, let's get this isuue straight, an Oxygen sensor (Lambda Sensor) produces voltage, it varies it's voltage according to the oxygen content in the exhaust.
How does an O2 sensor work?
An Oxygen sensor is a chemical generator. It is constantly making
a comparison between the Oxygen inside the exhaust manifold and air
outside the engine. If this comparison shows little or no
Oxygen in the exhaust manifold, a voltage is generated. The
output of the sensor is usually between 0 and 1.1 volts. All
spark combustion engines need the proper air fuel ratio to
operate correctly. For gasoline this is 14.7 parts of air to one
part of fuel. When the engine has more fuel than needed, all
available Oxygen is consumed in the cylinder and gasses leaving
through the exhaust contain almost no Oxygen. This sends out a
voltage greater than 0.45 volts. If the engine is running lean,
all fuel is burned, and the extra Oxygen leaves the cylinder and
flows into the exhaust. In this case, the sensor voltage goes
lower than 0.45 volts. Usually the output range seen seen is
0.2 to 0.7 volts.
The sensor does not begin to generate it's full output until it
reaches about 600 degrees F. Prior to this time the sensor is
not conductive. It is as if the circuit between the sensor and
computer is not complete. The mid point is about 0.45 volts.
This is neither rich nor lean. A fully warm O2 sensor *will not
spend any time at 0.45 volts*. In many cars, the computer sends
out a bias voltage of 0.45 through the O2 sensor wire. If the
sensor is not warm, or if the circuit is not complete, the computer
picks up a steady 0.45 volts. Since the computer knows this is
an "illegal" value, it judges the sensor to not be ready. It
remains in open loop operation, and uses all sensors except the
O2 to determine fuel delivery. Any time an engine is operated
in open loop, it runs somewhat rich and makes more exhaust
emissions. This translates into lost power, poor fuel economy
and air pollution.
The O2 sensor is constantly in a state of transition between high
and low voltage. Manufacturers call this crossing of the 0.45
volt mark O2 cross counts. The higher the number of O2 cross
counts, the better the sensor and other parts of the computer
control system are working. It is important to remember that the
O2 sensor is comparing the amount of Oxygen inside and outside
the engine. If the outside of the sensor should become blocked,
or coated with oil, sound insulation, undercoating or antifreeze,
(among other things), this comparison is not possible.
The Oxygen sensor is the only sensor that produces a voltage in modern automobiles, all the other sensors,eg,Coolant temp, TPS,MAP etc, varies the resistance of a circuit, these sensors require a 5 V baseline voltage from the ECM for them to work.
I hate to burst your bubble jemcam but in the past I have completely rewired ECM circuits, changing not only the length but also the gauge of the wires when doing engine swaps.It is true that if you use a wire with too high of a resistance it will change the operating characteristics of the sensors but you must keep in mind that to do so would require one of several things;
(1)An extremely long wire with increased resistance (Real long, I have increased the length by 5 feet with no ill effects)
(2)Poor quality wire (High resistance)
(3)Poor or corroded connections
(4)The use of crimp connectors (All connections must be soldered)
As was said before, the ECM sends out a 5 V reference signal, if the resistance of a wire drops that voltage to no more than 4.85 V, the ECM can still compensate for the difference.
All modern vehciles have ECM's that learn the basic characteristics of it's sensors and operating parameters, it compares baseline algorythems to the signals recieved from it's sensors and adjusts it calculations accordingly.
Don't believe me ?
Link 1
Link 2
Edit;
Someone remind me not to think so hard so early in the morning without first drinking my first cup of coffee and eating something, I now have a headache
How does an O2 sensor work?
An Oxygen sensor is a chemical generator. It is constantly making
a comparison between the Oxygen inside the exhaust manifold and air
outside the engine. If this comparison shows little or no
Oxygen in the exhaust manifold, a voltage is generated. The
output of the sensor is usually between 0 and 1.1 volts. All
spark combustion engines need the proper air fuel ratio to
operate correctly. For gasoline this is 14.7 parts of air to one
part of fuel. When the engine has more fuel than needed, all
available Oxygen is consumed in the cylinder and gasses leaving
through the exhaust contain almost no Oxygen. This sends out a
voltage greater than 0.45 volts. If the engine is running lean,
all fuel is burned, and the extra Oxygen leaves the cylinder and
flows into the exhaust. In this case, the sensor voltage goes
lower than 0.45 volts. Usually the output range seen seen is
0.2 to 0.7 volts.
The sensor does not begin to generate it's full output until it
reaches about 600 degrees F. Prior to this time the sensor is
not conductive. It is as if the circuit between the sensor and
computer is not complete. The mid point is about 0.45 volts.
This is neither rich nor lean. A fully warm O2 sensor *will not
spend any time at 0.45 volts*. In many cars, the computer sends
out a bias voltage of 0.45 through the O2 sensor wire. If the
sensor is not warm, or if the circuit is not complete, the computer
picks up a steady 0.45 volts. Since the computer knows this is
an "illegal" value, it judges the sensor to not be ready. It
remains in open loop operation, and uses all sensors except the
O2 to determine fuel delivery. Any time an engine is operated
in open loop, it runs somewhat rich and makes more exhaust
emissions. This translates into lost power, poor fuel economy
and air pollution.
The O2 sensor is constantly in a state of transition between high
and low voltage. Manufacturers call this crossing of the 0.45
volt mark O2 cross counts. The higher the number of O2 cross
counts, the better the sensor and other parts of the computer
control system are working. It is important to remember that the
O2 sensor is comparing the amount of Oxygen inside and outside
the engine. If the outside of the sensor should become blocked,
or coated with oil, sound insulation, undercoating or antifreeze,
(among other things), this comparison is not possible.
The Oxygen sensor is the only sensor that produces a voltage in modern automobiles, all the other sensors,eg,Coolant temp, TPS,MAP etc, varies the resistance of a circuit, these sensors require a 5 V baseline voltage from the ECM for them to work.
I hate to burst your bubble jemcam but in the past I have completely rewired ECM circuits, changing not only the length but also the gauge of the wires when doing engine swaps.It is true that if you use a wire with too high of a resistance it will change the operating characteristics of the sensors but you must keep in mind that to do so would require one of several things;
(1)An extremely long wire with increased resistance (Real long, I have increased the length by 5 feet with no ill effects)
(2)Poor quality wire (High resistance)
(3)Poor or corroded connections
(4)The use of crimp connectors (All connections must be soldered)
As was said before, the ECM sends out a 5 V reference signal, if the resistance of a wire drops that voltage to no more than 4.85 V, the ECM can still compensate for the difference.
All modern vehciles have ECM's that learn the basic characteristics of it's sensors and operating parameters, it compares baseline algorythems to the signals recieved from it's sensors and adjusts it calculations accordingly.
Don't believe me ?
Link 1
Link 2
Edit;
Someone remind me not to think so hard so early in the morning without first drinking my first cup of coffee and eating something, I now have a headache
- Oct 30, 1999
- 11,815
- 104
- 106
Being I'm not a GM man.... Does anyone know if this S10 has an oil cooler?
A number of factory oil coolers that I've seen, the kind that cool the oil w/ coolant from the cold side of the radiator, have failed over time and have mixed coolant with oil.
Just wondering, because if that's the case, this could be the easiest fix for this thing just short of selling it off.
A number of factory oil coolers that I've seen, the kind that cool the oil w/ coolant from the cold side of the radiator, have failed over time and have mixed coolant with oil.
Just wondering, because if that's the case, this could be the easiest fix for this thing just short of selling it off.
No one is owned, I am just stating facts, nothing else.
My post on the subject was not meant to be derogatory to anyone, I am just passing my knowledge on to you people.
My post on the subject was not meant to be derogatory to anyone, I am just passing my knowledge on to you people.
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