Stump the post? Urban legend or not? A/F hookup
12-20-2007, 08:15 PM
#1
Race Car
Thread Starter
Stump the post? Urban legend or not? A/F hookup
I was told "source to remain anonymous", that when hooking up an air fuel gauge to the Ox-sensor not to solder the wire on it.
The reason being the the Voltage wire coating is hollow and you can blow air through it!
On God's green earth I can't understand this, so what is it True _ or False_?
And yes this is from a very reliable source that got it from the Bosch manual!
The reason being the the Voltage wire coating is hollow and you can blow air through it!
On God's green earth I can't understand this, so what is it True _ or False_?And yes this is from a very reliable source that got it from the Bosch manual!
12-20-2007, 08:37 PM
#2
Craic Head
Lifetime Rennlist
Member
Lifetime Rennlist
Member
I've heard the same thing for a different reason.
I don't think you're supposed to solder the wire, but I'm pretty sure it's because it could fry something if you do it too close to the O2 sensor without a heat sink.
I soldered mine on and it seems to work fine.
I don't think you're supposed to solder the wire, but I'm pretty sure it's because it could fry something if you do it too close to the O2 sensor without a heat sink.
I soldered mine on and it seems to work fine.
12-20-2007, 08:53 PM
#3
Rennlist Member
That was on an alternate thread here just a few weeks ago. I think its crap! Not enough air is going to flow in there to influence or reference anything.
I soldered mine and used a bunch of heat shrink and it seems fine.
I soldered mine and used a bunch of heat shrink and it seems fine.
12-20-2007, 09:11 PM
#5
This is correct some O2 sensors have the atmosphere reference through the lead wires but some have a small tube sticking up out of the body. You should be able to locate this info on the Bosch web site.
12-20-2007, 09:13 PM
#6
Drifting
I work with an engineer who designed O2 sensors. This is a load of crap, unless you solder right down on the sensor itself. The sensor does pull reference air, but usually from a hole in the metal housing or in the rubber strain relief boot.
A vague signal effect may be seen from disimiliar metals (solder and wire) at the connection point, but with a narrow band O2 you will probably never see it.
A vague signal effect may be seen from disimiliar metals (solder and wire) at the connection point, but with a narrow band O2 you will probably never see it.
12-20-2007, 09:25 PM
#7
The sensor compares the oxygen in the exhaust and the oxygen from the atmosphere to generate the voltage signal. Anything that stops/slows the sensor from reading the reference air effects the sensor. I have attended many OBD classes and this subject comes up all the time. I have personally asked were is the best place to connect a air-fuel gauge. The reference air is taked from the pigtail connector. Any splice should go like this, O2-sensor,floor pan grommet, pigtail connector then splice.
Trending Topics
12-20-2007, 09:43 PM
#8
I work with an engineer who designed O2 sensors. This is a load of crap, unless you solder right down on the sensor itself. The sensor does pull reference air, but usually from a hole in the metal housing or in the rubber strain relief boot.
A vague signal effect may be seen from disimiliar metals (solder and wire) at the connection point, but with a narrow band O2 you will probably never see it.
A vague signal effect may be seen from disimiliar metals (solder and wire) at the connection point, but with a narrow band O2 you will probably never see it.
12-20-2007, 11:47 PM
#11
Rennlist Member
Join Date: Dec 2002
Posts: 1,051
Likes: 0
Received 0 Likes
on
0 Posts
Bosch O2 sensor information, including statements at the bottom of the page about the sensor getting it's reference air throught the wire, and on not soldering:
http://www.bosch-motorsport.com/pdf/...bda/LSM_11.pdf
From GM service Document ID# 21916:
From GM service Document ID# 303655:
From a GM service manual:
A page from an automotive service training manual:
http://books.google.com/books?id=kGz...qjQrQdbhLmD1Os
http://www.bosch-motorsport.com/pdf/...bda/LSM_11.pdf
From GM service Document ID# 21916:
Notice: Do not solder heated oxygen sensor wires. Soldering the wires will result in the loss of the air reference to the sensor. Refer to Engine Electrical for proper wire and connection repair techniques.
From GM service Document ID# 303655:
Heated Oxygen Sensor Wiring Repairs
Tools Required
J-38125 Terminal Repair Kit
Notice: Do not solder repairs under any circumstances as this could result in the air reference being obstructed.
If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance.
The following guidelines should be used when servicing the heated oxygen sensor:
• Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
• Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire.
• Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance.
• To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector.
The engine harness may be repaired using the J-38125.
Tools Required
J-38125 Terminal Repair Kit
Notice: Do not solder repairs under any circumstances as this could result in the air reference being obstructed.
If the heated oxygen sensor pigtail wiring, connector, or terminal is damaged the entire oxygen sensor assembly must be replaced. Do not attempt to repair the wiring, connector, or terminals. In order for the sensor to function properly it must have a clean air reference. This clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors or terminals could result in the obstruction of the air reference and degrade oxygen sensor performance.
The following guidelines should be used when servicing the heated oxygen sensor:
• Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor, causing poor performance. Also, the sensor pigtail and harness wires must not be damaged in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
• Neither the sensor nor vehicle lead wires should be bent sharply or kinked. Sharp bends, kinks, etc., could block the reference air path through the lead wire.
• Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wire sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will also cause poor engine performance.
• To prevent damage due to water intrusion, be sure that the peripheral seal remains intact on the vehicle harness connector.
The engine harness may be repaired using the J-38125.
From a GM service manual:
Handle the oxygen sensor carefully. Do not drop the HO2S. Keep the in-line electrical connector and the louvered end free of grease, dirt, or other contaminants. Do not use cleaning solvents of any type.
Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged.
This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.
The following guidelines should be used when servicing the heated oxygen sensor:
Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
Ensure the sensor or vehicle lead wires should not be bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion.
The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit.
Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.
Do not repair the wiring, connector or terminals. Replace the oxygen sensor if the pigtail wiring, connector, or terminal is damaged.
This external clean air reference is obtained by way of the oxygen sensor signal and heater wires. Any attempt to repair the wires, connectors, or terminals could result in the obstruction of the air reference and degraded sensor performance.
The following guidelines should be used when servicing the heated oxygen sensor:
Do not apply contact cleaner or other materials to the sensor or vehicle harness connectors. These materials may get into the sensor causing poor performance.
Do not damage the sensor pigtail and harness wires in such a way that the wires inside are exposed. This could provide a path for foreign materials to enter the sensor and cause performance problems.
Ensure the sensor or vehicle lead wires should not be bent sharply or kinked. Sharp bends or kinks could block the reference air path through the lead wire.
Do not remove or defeat the oxygen sensor ground wire (where applicable). Vehicles that utilize the ground wired sensor may rely on this ground as the only ground contact to the sensor. Removal of the ground wire will cause poor engine performance.
Ensure that the peripheral seal remains intact on the vehicle harness connector in order to prevent damage due to water intrusion.
The engine harness may be repaired using Packard's Crimp and Splice Seals Terminal Repair Kit.
Under no circumstances should repairs be soldered since this could result in the air reference being obstructed.
A page from an automotive service training manual:
http://books.google.com/books?id=kGz...qjQrQdbhLmD1Os
12-21-2007, 09:51 AM
#12
Addict
Rennlist
Site Sponsor
Rennlist
Site Sponsor
Join Date: Jan 2003
Location: Green Bay Wisconsin
Posts: 951
Likes: 0
Received 0 Likes
on
0 Posts
I was told "source to remain anonymous", that when hooking up an air fuel gauge to the Ox-sensor not to solder the wire on it.
The reason being the the Voltage wire coating is hollow and you can blow air through it! On God's green earth I can't understand this, so what is it True _ or False_?
And yes this is from a very reliable source that got it from the Bosch manual!
The reason being the the Voltage wire coating is hollow and you can blow air through it!
On God's green earth I can't understand this, so what is it True _ or False_?And yes this is from a very reliable source that got it from the Bosch manual!
