302 oxygen sensor
09-08-2016, 11:08 PM
#42
Sgt Shawshank
I'm going to resurrect this thread because I know Mike is on the up and up with how these older engines work and how the computer works and I'm just not that familiar with the older computers.
Back story.
86 bronco
351w
That's fuel injected. Yes yes I know you'll tell me but Seth in 86 the 351 wasn't fuel injected and you'd be right. But I've put one out of a 91 in it and put a computer out of a 91 truck with a manual in it and all is well with the world again. Well kinda.
I'm RICH.
Not monetary (nor will I ever get that way with as much fuel as this thing is drinking)
Currently the 02 sensor is tucked into a crossover pipe that runs between both heads on the back of the engine.
Had my exhaust hooked up after putting on some long tubes today and had him add a bung to the passenger side where I've installed a new 02 sensor that I will wire in where the old sensor is wired in at.
My question is: Will putting this new 02 sensor in the exhaust where it can actually see the air/fuel ratio improve my idle and drive-ability and a whole host of other issues that comes with being rich? Or is it possible that I'll have problems elsewhere?
Back story.
86 bronco
351w
That's fuel injected. Yes yes I know you'll tell me but Seth in 86 the 351 wasn't fuel injected and you'd be right. But I've put one out of a 91 in it and put a computer out of a 91 truck with a manual in it and all is well with the world again. Well kinda.
I'm RICH.
Not monetary (nor will I ever get that way with as much fuel as this thing is drinking)
Currently the 02 sensor is tucked into a crossover pipe that runs between both heads on the back of the engine.
Had my exhaust hooked up after putting on some long tubes today and had him add a bung to the passenger side where I've installed a new 02 sensor that I will wire in where the old sensor is wired in at.
My question is: Will putting this new 02 sensor in the exhaust where it can actually see the air/fuel ratio improve my idle and drive-ability and a whole host of other issues that comes with being rich? Or is it possible that I'll have problems elsewhere?
09-09-2016, 01:41 AM
#43
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Seth. I hear you, but gimme a day or two. Personally, I'm healthy as an ox for a man of my age, but a close family member is not. I have to be there for her. If i don't reply w/ in the next 2 days, Remind me via PM.
Last edited by ymeski56; 09-09-2016 at 01:49 AM.
09-09-2016, 08:28 AM
#44
Sgt Shawshank
No hurry Mike. I picked up a new sensor yesterday anyway just to be on the safe side and am going to put it in today and if that doesn't work then I'll get back to you.
09-11-2016, 10:04 PM
#45
Sgt Shawshank
Well I put the 02 sensor in and it ran great for a couple of hours. Drove to town then headed home after finishing my errands and the damn thing started running so rich it started pouring black smoke out both pipes. It's true dual so I've decided it can't be a stuck injector because it's coming out both sides so that highly unlikely for 2 to stick at the same time.
Video of said black smoke.
Video of said black smoke.
09-13-2016, 10:10 PM
#46
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I'm going to resurrect this thread because I know Mike is on the up and up with how these older engines work and how the computer works and I'm just not that familiar with the older computers.
Back story.
86 bronco
351w
That's fuel injected. Yes yes I know you'll tell me but Seth in 86 the 351 wasn't fuel injected and you'd be right. But I've put one out of a 91 in it and put a computer out of a 91 truck with a manual in it and all is well with the world again. Well kinda.
I'm RICH.
Not monetary (nor will I ever get that way with as much fuel as this thing is drinking)
Currently the 02 sensor is tucked into a crossover pipe that runs between both heads on the back of the engine.
Had my exhaust hooked up after putting on some long tubes today and had him add a bung to the passenger side where I've installed a new 02 sensor that I will wire in where the old sensor is wired in at.
My question is: Will putting this new 02 sensor in the exhaust where it can actually see the air/fuel ratio improve my idle and drive-ability and a whole host of other issues that comes with being rich? Or is it possible that I'll have problems elsewhere?
Back story.
86 bronco
351w
That's fuel injected. Yes yes I know you'll tell me but Seth in 86 the 351 wasn't fuel injected and you'd be right. But I've put one out of a 91 in it and put a computer out of a 91 truck with a manual in it and all is well with the world again. Well kinda.
I'm RICH.
Not monetary (nor will I ever get that way with as much fuel as this thing is drinking)
Currently the 02 sensor is tucked into a crossover pipe that runs between both heads on the back of the engine.
Had my exhaust hooked up after putting on some long tubes today and had him add a bung to the passenger side where I've installed a new 02 sensor that I will wire in where the old sensor is wired in at.
My question is: Will putting this new 02 sensor in the exhaust where it can actually see the air/fuel ratio improve my idle and drive-ability and a whole host of other issues that comes with being rich? Or is it possible that I'll have problems elsewhere?
Gut feeling is the the O2 is not the culprit of such an over rich condition, but I want to make sure I understand your current exhaust setup.
Sidenote: Anytime you replace a sensor (or major component that would influence sensor readings) on an OBD1 generation PMC/ECU controlled engine, disconnect the battery for at least 5 minutes (!0 to be sure), to clear the KAM (Kept Access Memory). After multiple out of range readings reported to the PCM by a sensor, The PCM locks out any further input from that sensor, & substitutes a mean line static setting for that sensor..
Resetting the KAM reopens communication from the sensor, removing the lockout (weather it's still the old sensor or new sensor).
Last edited by ymeski56; 09-13-2016 at 10:58 PM.
09-15-2016, 02:19 PM
#47
Sgt Shawshank
So we're on the same page, O2 sensor "was" mounted in crossover that combined the exhaust output of both left & right banks, & you are now running separate bank exhausts, 1 for the left/ 1 for the right & the O2 sensor now just monitors one bank (Passenger side)?
Gut feeling is the the O2 is not the culprit of such an over rich condition, but I want to make sure I understand your current exhaust setup.
Sidenote: Anytime you replace a sensor (or major component that would influence sensor readings) on an OBD1 generation PMC/ECU controlled engine, disconnect the battery for at least 5 minutes (!0 to be sure), to clear the KAM (Kept Access Memory). After multiple out of range readings reported to the PCM by a sensor, The PCM locks out any further input from that sensor, & substitutes a mean line static setting for that sensor..
Resetting the KAM reopens communication from the sensor, removing the lockout (weather it's still the old sensor or new sensor).
Gut feeling is the the O2 is not the culprit of such an over rich condition, but I want to make sure I understand your current exhaust setup.
Sidenote: Anytime you replace a sensor (or major component that would influence sensor readings) on an OBD1 generation PMC/ECU controlled engine, disconnect the battery for at least 5 minutes (!0 to be sure), to clear the KAM (Kept Access Memory). After multiple out of range readings reported to the PCM by a sensor, The PCM locks out any further input from that sensor, & substitutes a mean line static setting for that sensor..
Resetting the KAM reopens communication from the sensor, removing the lockout (weather it's still the old sensor or new sensor).
I've sense come to learn that the 302 was a single wire 02 sensor and the 351w was only a 3 wire sensor so could that be part of the problem? Also I've got to try to reset the computer because it's running way richer now than before.
09-16-2016, 07:25 PM
#48
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The sensor was originally in a pipe that bolts to the back of both heads where it didn't see any exhaust, the computer was saying it had been lean. Now it's actually in the exhaust in the original location.
I've sense come to learn that the 302 was a single wire 02 sensor and the 351w was only a 3 wire sensor so could that be part of the problem? Also I've got to try to reset the computer because it's running way richer now than before.
I've sense come to learn that the 302 was a single wire 02 sensor and the 351w was only a 3 wire sensor so could that be part of the problem? Also I've got to try to reset the computer because it's running way richer now than before.
Yes, You need to reset computer (Clear the KAM) as described in my sidenote in previous post.
09-16-2016, 07:53 PM
#49
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Last edited by ymeski56; 09-16-2016 at 07:59 PM.
09-16-2016, 08:02 PM
#50
Sgt Shawshank
Pic is of the o2 sensor for my 86 302.
After resetting computer it's still running rich.
