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Old Tue, January 24th, 2012, 01:10 PM
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Question Lean code

I installed my longtubes a few months ago with resonators. I installed the front O2 sensors, but my rears where both pretty much welded into place so I left them off. I have a tune from PHP to account for my cat delete, but just about a month ago I started to get a code for my bank 2 running lean. I was towing something at the time on my tow tune, so I switched back to the performance tune and cleared the code, but a few days later the code popped up again. Is the fact that I do not have my rear O2s causing this or is it something tune related?
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Old Sun, January 29th, 2012, 04:00 PM
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Any ideas? Over on F150online, it was suggested that I may have either a vaccum leak or a leak into the headers which is causing a false reading. I had the code pop up again last night for the first time in about a week.
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Old Mon, January 30th, 2012, 11:59 AM
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The fact that you're getting it on different tunes suggests a mechanical problem like a leak to me too. But I don't have any suggestions about how to find it. I wonder if there'd be any "blowby" that might create a "soot mark" if there's a leak?

Sometimes you can hear a leak "whistle", but you might need a stethoscope to be able to isolate that from other engine noises.

- Jack
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Old Wed, February 1st, 2012, 08:33 AM
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Quote:
Originally Posted by JackandJanet View Post
The fact that you're getting it on different tunes suggests a mechanical problem like a leak to me too. But I don't have any suggestions about how to find it. I wonder if there'd be any "blowby" that might create a "soot mark" if there's a leak?

Sometimes you can hear a leak "whistle", but you might need a stethoscope to be able to isolate that from other engine noises.

- Jack
Whenever I let the truck idle, I can hear something sounds like it is rattling (I think that may be the fasteners from the Stage 8 bolts), but nothing like a whistle. So, I cleared the lean code and about a week later it popped up again. But this time it had another one...
P0174: System Too Lean (Bank 2)
P2196: O2 Sensor Signal Biased/Stuck rich - Bank 1/Sensor 1

So, what is going on here? My best guess at this point is an exhaust leak on the gaskets (I had reused the Ford factory ones), causing the system too lean code. Truck tried to compensate and started to actually run rich, causing the driver side O2 to go bad... Just want to get ideas before I go back under and start trying to fix things, not exactly the easiest to change the gasket for the passenger side header.

Also, if it makes a difference, I soldered in my own extensions for the front O2 sensors. I wouldn't say I did a poor job, but it was my first time soldering, so could that possibly be causing these issues?
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Old Wed, February 1st, 2012, 10:07 AM
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Quote:
Originally Posted by bconnaway View Post
Whenever I let the truck idle, I can hear something sounds like it is rattling (I think that may be the fasteners from the Stage 8 bolts), but nothing like a whistle. So, I cleared the lean code and about a week later it popped up again. But this time it had another one...
P0174: System Too Lean (Bank 2)
P2196: O2 Sensor Signal Biased/Stuck rich - Bank 1/Sensor 1

So, what is going on here? My best guess at this point is an exhaust leak on the gaskets (I had reused the Ford factory ones), causing the system too lean code. Truck tried to compensate and started to actually run rich, causing the driver side O2 to go bad... Just want to get ideas before I go back under and start trying to fix things, not exactly the easiest to change the gasket for the passenger side header.

Also, if it makes a difference, I soldered in my own extensions for the front O2 sensors. I wouldn't say I did a poor job, but it was my first time soldering, so could that possibly be causing these issues?
First time soldering? Certainly could be the cause of lots of problems. They could arise from having a poor solder connection to heat damage on the sensor itself during the soldering process. (Although since O2 sensors are exposed to great heat in operation, I suspect that is not the problem.)

The "stuck rich" signal from one of the sensors indicates a sensor malfunction. Those sensors are actually fairly complicated devices, and they incorporate a heating element to get them working sooner. Here's a description or the Heated O2 Sensor:
The HO2S detects the presence of oxygen in the exhaust and produces a variable voltage according to the amount of oxygen detected. A high concentration of oxygen (lean air/fuel ratio) in the exhaust produces a voltage signal less than 0.4 volt. A low concentration of oxygen (rich air/fuel ratio) produces a voltage signal greater than 0.6 volt. The HO2S provides feedback to the PCM indicating air/fuel ratio in order to achieve a near stoichiometric air/fuel ratio of 14.7:1 during closed loop engine operation. The HO2S generates a voltage between 0.0 and 1.1 volts.
I really don't have any brilliant ideas about this, but I'd have to suspect a problem with the sensors themselves at this point. Trouble is, they're expensive, so you don't want to replace them if it's not the problem.

Can you tell me exactly what it was that you soldered? Was it "extensions" to the wiring? If so, did you insure you had a solid mechanical connection between the two wires before applying solder and, what did you use to insulate the exposed connection? Solder itself is not really there to conduct electricity - it mostly makes the connection "permanent" and coats the connection to prevent oxidization (corrosion).

- Jack
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Old Wed, February 1st, 2012, 08:36 PM
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Quote:
Originally Posted by JackandJanet View Post
First time soldering? Certainly could be the cause of lots of problems. They could arise from having a poor solder connection to heat damage on the sensor itself during the soldering process. (Although since O2 sensors are exposed to great heat in operation, I suspect that is not the problem.)

The "stuck rich" signal from one of the sensors indicates a sensor malfunction. Those sensors are actually fairly complicated devices, and they incorporate a heating element to get them working sooner. Here's a description or the Heated O2 Sensor:
The HO2S detects the presence of oxygen in the exhaust and produces a variable voltage according to the amount of oxygen detected. A high concentration of oxygen (lean air/fuel ratio) in the exhaust produces a voltage signal less than 0.4 volt. A low concentration of oxygen (rich air/fuel ratio) produces a voltage signal greater than 0.6 volt. The HO2S provides feedback to the PCM indicating air/fuel ratio in order to achieve a near stoichiometric air/fuel ratio of 14.7:1 during closed loop engine operation. The HO2S generates a voltage between 0.0 and 1.1 volts.
I really don't have any brilliant ideas about this, but I'd have to suspect a problem with the sensors themselves at this point. Trouble is, they're expensive, so you don't want to replace them if it's not the problem.

Can you tell me exactly what it was that you soldered? Was it "extensions" to the wiring? If so, did you insure you had a solid mechanical connection between the two wires before applying solder and, what did you use to insulate the exposed connection? Solder itself is not really there to conduct electricity - it mostly makes the connection "permanent" and coats the connection to prevent oxidization (corrosion).

- Jack
When I soldered them, this is the process I used:
  1. Cut the wiring on the O2 sensor about half way up
  2. Strip wire and the wire for a 6" extension
  3. Heat the wire from the O2 sensor with the soldering gun
  4. Once the wire is hot enough, place a small amount of solder on that wire
  5. Heat the wire from the extension and once hot enough, put solder on this wire
  6. Put the wires together and heat the solder from each wire until they connect
  7. Repeat process for remaining 3 wires
  8. Electrical tape the soldered connections
  9. Electrical tape the entire extension

I was doing this based on what my roommate had told me to do (he's an electrical engineer), but this process definitely has the solder as the main form of contact between the wires. I could go back and try to re-solder the wires to see if that helps. If not, I may end up having to just buy new O2 sensors and actually buy some commercial extensions. Biggest thing though is I really don't want there to be a different problem, replace these sensors, then have them ruined. Just trying to go through the list of the minor/cheaper fixes before tackling that.
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2004 5.4L Lariat Supercrew. OBX long tubes w/ resonators. Magnaflow X-pipe. Dynomax Bullets. Flowmaster slashed tips. AEM Brute Force CAI. Gryphon w/ custom 89 performance tune by PHP. Pioneer AVIC-X920BT. Kenwood KAC-7204. Dual 10" MTX Thunder Thins. Go Rhino Chrome Bed Bar. 4 KC 130W Daylighters. 2.5" Autospring Levelling Kit. 1.5" Autospring Add-A-Leaf. BFGoodrich AT 275/65-18.
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Old Thu, February 2nd, 2012, 10:05 AM
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Quote:
Originally Posted by bconnaway View Post
When I soldered them, this is the process I used:
  1. Cut the wiring on the O2 sensor about half way up
  2. Strip wire and the wire for a 6" extension
  3. Heat the wire from the O2 sensor with the soldering gun
  4. Once the wire is hot enough, place a small amount of solder on that wire
  5. Heat the wire from the extension and once hot enough, put solder on this wire
  6. Put the wires together and heat the solder from each wire until they connect
  7. Repeat process for remaining 3 wires
  8. Electrical tape the soldered connections
  9. Electrical tape the entire extension

I was doing this based on what my roommate had told me to do (he's an electrical engineer), but this process definitely has the solder as the main form of contact between the wires. I could go back and try to re-solder the wires to see if that helps. If not, I may end up having to just buy new O2 sensors and actually buy some commercial extensions. Biggest thing though is I really don't want there to be a different problem, replace these sensors, then have them ruined. Just trying to go through the list of the minor/cheaper fixes before tackling that.
What you're doing is called "tinning" the wires (applying solder to the wires before joining them). For electronic projects, with stranded wire especially, I don't care for this procedure. As you say, it initially makes the bond "solder to solder" rather than "wire to wire". Additionally, the solder makes the wires "stiff" so it becomes very hard to twist them together tightly.

When I solder wires, I join them and THEN heat and apply enough solder so that it flows easily into the joined connection, and when it cools, the appearance is "shiny bright" and not "frosted" which would indicate a "cold solder joint". Also, I use a quality grade of electronic solder (which is usually a very fine wire) as opposed to the thicker "rosen core solder". Of course, you never use acid core "metal mender" solder on electrical connections.

Here's a link that contains a video that shows how I join two wires: How To Solder - Soldering Tutorial I use heat shrink tubing to protect the join afterwards and shrink it with a heat gun (a hair dryer will work if you don't have a heat gun). If the area is going to be exposed to heavy elements (like what's under a truck), I will also paint the joint with Liquid Tape (over the shrink tube as additional protection).

Here's another link that shows various splices: New Document The one I like for two wires is the "Western Union Splice". And, I use a soldering gun rather than a low-wattage soldering iron to join wires like this.

I don't like electrical tape. I think heat shrink tubing and Liquid Tape is far superior. I also prefer the heat shrink tubing that has adhesive inside.

Anyway, these are my thoughts. I suspect you have enough "original wire" to redo the extensions, if you want to give that a try.

- Jack
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Old Thu, February 2nd, 2012, 11:43 AM
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Quote:
Originally Posted by JackandJanet View Post
What you're doing is called "tinning" the wires (applying solder to the wires before joining them). For electronic projects, with stranded wire especially, I don't care for this procedure. As you say, it initially makes the bond "solder to solder" rather than "wire to wire". Additionally, the solder makes the wires "stiff" so it becomes very hard to twist them together tightly.

When I solder wires, I join them and THEN heat and apply enough solder so that it flows easily into the joined connection, and when it cools, the appearance is "shiny bright" and not "frosted" which would indicate a "cold solder joint". Also, I use a quality grade of electronic solder (which is usually a very fine wire) as opposed to the thicker "rosen core solder". Of course, you never use acid core "metal mender" solder on electrical connections.

Here's a link that contains a video that shows how I join two wires: How To Solder - Soldering Tutorial I use heat shrink tubing to protect the join afterwards and shrink it with a heat gun (a hair dryer will work if you don't have a heat gun). If the area is going to be exposed to heavy elements (like what's under a truck), I will also paint the joint with Liquid Tape (over the shrink tube as additional protection).

Here's another link that shows various splices: New Document The one I like for two wires is the "Western Union Splice". And, I use a soldering gun rather than a low-wattage soldering iron to join wires like this.

I don't like electrical tape. I think heat shrink tubing and Liquid Tape is far superior. I also prefer the heat shrink tubing that has adhesive inside.

Anyway, these are my thoughts. I suspect you have enough "original wire" to redo the extensions, if you want to give that a try.

- Jack
Thanks for all the information! I'll try to re-solder the wires this weekend and see if that solves the problem.
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Old Thu, February 2nd, 2012, 08:13 PM
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Should've used extender extensions....better than soldering
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