New O2 Sensor, In New Location, Lean Code #41
Thread Starter
|
Tuned
Joined: Sep 2014
Posts: 358
Likes: 7
From: Ky
New O2 Sensor, In New Location, Lean Code #41
Had a new complete exhaust welded up by a great local guy.
When he did my 89' Crewcab, also a 460, the new oxygen sensor that I supplied was installed in a length of straight pipe horizontally, very similar if not identical to factory.
When he did my 89' Standard Cab 460 truck, for some reason the newly fabricated "Y" connection ended up a little further rearward, and he installed the O2 sensor in the "Y" from above that looks a little like it may be a slight dead air space, if you can envision that.
Or to put it a bit differently, that the exhaust gases from two locations have just begun to meet at that spot, may not have blended, and may be passing below the O2 sensors nose for an accurate sample.
As far as other things that cause a Code #41 (Lean), I haven't begun to look into them, I have a list here.
I mentioned it to him, he didn't seem to think it would be a problem, he mentioned he's done them that way before, he's done a LOT of exhaust systems.
It didn't trip the code the first few times I drove it, maybe the fourth time, if it was a "soft code" until that fourth "key on" I'm not sure.
Just wondered if anyone may have tripped fault codes with O2 sensors along these lines.
Thanks and Merry Christmas!
When he did my 89' Crewcab, also a 460, the new oxygen sensor that I supplied was installed in a length of straight pipe horizontally, very similar if not identical to factory.
When he did my 89' Standard Cab 460 truck, for some reason the newly fabricated "Y" connection ended up a little further rearward, and he installed the O2 sensor in the "Y" from above that looks a little like it may be a slight dead air space, if you can envision that.
Or to put it a bit differently, that the exhaust gases from two locations have just begun to meet at that spot, may not have blended, and may be passing below the O2 sensors nose for an accurate sample.
As far as other things that cause a Code #41 (Lean), I haven't begun to look into them, I have a list here.
I mentioned it to him, he didn't seem to think it would be a problem, he mentioned he's done them that way before, he's done a LOT of exhaust systems.
It didn't trip the code the first few times I drove it, maybe the fourth time, if it was a "soft code" until that fourth "key on" I'm not sure.
Just wondered if anyone may have tripped fault codes with O2 sensors along these lines.
Thanks and Merry Christmas!
Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
How far back did you go with the o2 sensor?
I fixing to go dual 2 1/2" into a premade y pipe then a single 3" out into a flow master.
But I bought 2 12" o2 extensions that will put my o2 sensor just past the cab.
Just asking because I didn't think it would be an issue.
But maybe your o2 sensor is in a dead spot.
What does the y pipe they fabricated look like?
I fixing to go dual 2 1/2" into a premade y pipe then a single 3" out into a flow master.
But I bought 2 12" o2 extensions that will put my o2 sensor just past the cab.
Just asking because I didn't think it would be an issue.
But maybe your o2 sensor is in a dead spot.
What does the y pipe they fabricated look like?
Thread Starter
|
Tuned
Joined: Sep 2014
Posts: 358
Likes: 7
From: Ky
Brand new Bosch O2 sensor in both trucks.
Both trucks will always show a code #33 which won't flash the MIL light, a result of the EGR Delete plug/electronic bypass that is on both systems.
On the truck in question, the Innova Code reader won't work at present, but at the Data Link my analog meter will count needle sweeps.
Suspect at present some electrical resistance there that I've not addressed.
Both trucks will always show a code #33 which won't flash the MIL light, a result of the EGR Delete plug/electronic bypass that is on both systems.
On the truck in question, the Innova Code reader won't work at present, but at the Data Link my analog meter will count needle sweeps.
Suspect at present some electrical resistance there that I've not addressed.
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
I would start by verifying your fuel pressure. It should be 40 PSI when you cycle the key, 32-34 PSI at idle, and it should increase to near 40 PSI if you snap the throttle wide open with the engine running.
Thread Starter
|
Tuned
Joined: Sep 2014
Posts: 358
Likes: 7
From: Ky
Truck had a new front in-tank pump just before I bought it, then I put on high press. in-line pump, fuel press. reg., rebuilt all injectors, and fuel filter of course.
One oddity to add that's fuel-related is that my fuel gauge went to overfull a couple of times, then returned to normal.
And I currently only run on the front tank.
All the above (and much more) in the last year and maybe 250-500 miles.
One oddity to add that's fuel-related is that my fuel gauge went to overfull a couple of times, then returned to normal.
And I currently only run on the front tank.
All the above (and much more) in the last year and maybe 250-500 miles.
More Turbo
Joined: Feb 2015
Posts: 508
Likes: 29
From: NE Ohio
I suggest verifying voltage to the O2, and continuity of signal wire as well. I've heard that the lean code COULD be a result of no signal from the O2, meaning that I don't think there is a specific code for O2 fault, but I could be wrong.
If you verify the voltage and signal are good, then I would be leaning towards a bad spot in the exhaust.
Good Luck!
If you verify the voltage and signal are good, then I would be leaning towards a bad spot in the exhaust.
Good Luck!
Trending Topics
Senior User
Joined: Dec 2010
Posts: 359
Likes: 0
From: Shafer, MN
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
Yes, IIRC Conanski spoke of this some time ago. He even used Tweecer or Moates Quarterhorse in trying to adjust for it.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The O2 sensor should go as close to the engine as possible and it doesn't matter if that means it only "sees" one side of the motor.. all injectors get the same fueling anyway with the batch fired system most of these trucks have.
Laughing Gas
Joined: Jan 2012
Posts: 1,106
Likes: 25
But what happens when you extend the wires back from the stock location?
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The computer is programmed to react to how the sensor behaves in the stock location, that is in terms of the actual mixture it sees and timing of events(exhaust pulses). Both of those things will be different further back in the exhaust even when the motor is running exactly as it should.