O2 Sensor question
Are any of you that run Holley HP EFI having a hard time with O2 sensor longevity? I was wondering if the moisture from Headers is killing my sensor.
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This guy has worked wonders for me. EVIL ENERGY O2 Oxygen Sensor Bung M18x1.5 Copper https://www.amazon.com/dp/B07G81XZZT/ref=cm_sw_r_cp_api_i_yjUuDbNF6YSVJ |
Originally Posted by Baja Rooster
(Post 4701846)
This guy has worked wonders for me. EVIL ENERGY O2 Oxygen Sensor Bung M18x1.5 Copper https://www.amazon.com/dp/B07G81XZZT/ref=cm_sw_r_cp_api_i_yjUuDbNF6YSVJ |
There will always be moisture in a marine exhaust, the moisture/condensation will ultimately render the o2 sensor useless over time and you will have to replace them once in a while. Keep a spare with you. Or use an o2 bung as recommended by Baja above that will make it harder for the moisture to reach the o2 sensor.
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Are you running the NTK sensors? I was told that they work better in the marine environment.
These help also. https://www.ebay.com/itm/INNOVATE-MO...gAAOSwhglTx8Y0 |
No I’m not yet. I’m replacing with Bosch and will get a bing extension and see how that does first. I was told same thing by my tuner. They are 100 more per unit and last a little longer. |
Originally Posted by Rookie
(Post 4701908)
Are you running the NTK sensors? I was told that they work better in the marine environment.
These help also. https://www.ebay.com/itm/INNOVATE-MO...gAAOSwhglTx8Y0 |
I never had any issues to begin with, but have always ran the Innovative bung extender from day one on my wideband. When i put fuel injection on I got the 90° one that I listed as it’s pretty much the same but the bend allowed me to clock it so the sensor is way up away from the water. 50 or so hours so far and no issues. |
Originally Posted by Baja Rooster
(Post 4701981)
I never had any issues to begin with, but have always ran the Innovative bung extender from day one on my wideband. When i put fuel injection on I got the 90° one that I listed as it’s pretty much the same but the bend allowed me to clock it so the sensor is way up away from the water. 50 or so hours so far and no issues. |
thanks guys, Ill be doing the same now. new O2 is on a slow truck from holley to me.............
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Both the extenders mentioned here have an 1/8” hole for the gas to pass through but makes a pretty effective dam against the water. Some folks here had no luck with them but sometimes the setup is too much for anything to help. |
Originally Posted by Trash
(Post 4702002)
Just for more data I run that extender as well and have about 250 hrs of run time on the same O2 sensor.
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You might have to play with various washers to clock the intake port into the exhaust stream. It is actually designed to protect from overheat from a turbo application, but works well for errant water that may enter the exhaust.
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Originally Posted by Baja Rooster
(Post 4701846)
This guy has worked wonders for me. EVIL ENERGY O2 Oxygen Sensor Bung M18x1.5 Copper https://www.amazon.com/dp/B07G81XZZT..._yjUuDbNF6YSVJ I tried the Innovate heat sink and felt the readings were not accurate ..but that was when I had leaky headers .. |
Originally Posted by Baja Rooster
(Post 4701846)
This guy has worked wonders for me. EVIL ENERGY O2 Oxygen Sensor Bung M18x1.5 Copper https://www.amazon.com/dp/B07G81XZZT..._yjUuDbNF6YSVJ |
The way to keep those sensors alive is to use a cam that won't revert water. Or extend the exhaust way out dry. I gave somebody on here some crap about the extender recently, cuz those 90 degree extenders were invented to fool car ecm's with bad catalytic converters.
But in retrospect I can see how it could succeed in a boat. Boats often run at a steady state so they would have the same reading once the exhaust gas hits the sensor. Cars have constant change in the throttle position, so that's where my attitude came from. I finally installed my own AEM kit literally yesterday and only ran it for a few minutes on muffs. It did not get wet even though EMI had put my sensor bung in horizontally. When I had them warranty out my riser they did the bung. I hadn't yet seen AEM's instruction to tilt it down at least 10 degrees, and don't mount it vertical. Apparently straight down burns them up and flat can hold moisture. I'm looking forward to fine adjusting my carb. Then I'll pull off the sensor to save it. You all that have sensor EFI don't get that choice so you need a solution that will let the sensor live. |
I have run the innovate heat sink bung for years and never had an issue with the sensor getting wet and I have a pretty large cam. Jeff Wurl |
I went a bit overkill with protecting the FI O2 sensor, but in back to back testing it made no difference. https://cimg4.ibsrv.net/gimg/www.off...b8a5834db.jpeg |
Originally Posted by Baja Rooster
(Post 4702085)
I went a bit overkill with protecting the FI O2 sensor, but in back to back testing it made no difference. https://cimg4.ibsrv.net/gimg/www.off...b8a5834db.jpeg |
Originally Posted by NHGuy
(Post 4702070)
The way to keep those sensors alive is to use a cam that won't revert water. Or extend the exhaust way out dry. I gave somebody on here some crap about the extender recently, cuz those 90 degree extenders were invented to fool car ecm's with bad catalytic converters.
But in retrospect I can see how it could succeed in a boat. Boats often run at a steady state so they would have the same reading once the exhaust gas hits the sensor. Cars have constant change in the throttle position, so that's where my attitude came from. I finally installed my own AEM kit literally yesterday and only ran it for a few minutes on muffs. It did not get wet even though EMI had put my sensor bung in horizontally. When I had them warranty out my riser they did the bung. I hadn't yet seen AEM's instruction to tilt it down at least 10 degrees, and don't mount it vertical. Apparently straight down burns them up and flat can hold moisture. I'm looking forward to fine adjusting my carb. Then I'll pull off the sensor to save it. You all that have sensor EFI don't get that choice so you need a solution that will let the sensor live. |
Originally Posted by articfriends
(Post 4702147)
So you got a good reading with all that?
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are there any markings or tell tale signs the that you can see if it is getting wet? Mine has lasted 63 hours.
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Originally Posted by Cerberus66
(Post 4702194)
are there any markings or tell tale signs the that you can see if it is getting wet? Mine has lasted 63 hours.
FWIW, one other thing I did and I don't know if it helped is that I run open loop, no learn until 1500 rpm. My thought is the higher the rpm, the more consistent the exhaust flow and less likely to have water hit the O2, also, it should be hotter and more likely to flash off any condensation. Like I said - not sure if this helps, not sure if Holley shuts the power off to the O2 if its not in closed loop, but this Bosch O2 has lasted....and I've not had to hook up the PC in over 3yrs. |
Originally Posted by rvander68
(Post 4702293)
For me it was pretty instant. Water shorts it out, the computer thinks the motor is lean and it dumps gas at it, motor dies. I didn't notice any signs before hand or felt it was getting worse over time. I went to the Innovative mentioned and have had well over 100 hrs on this current sensor w/o issue. I too verified the reading with the Innovative to be within 0.1-0.2 of the reading w/o it; I only have one O2 so I tested back-to-back using the same sensor. If you look at the Innovative, you clock it so the inlet is facing into the exhaust stream. On the bottom of the cylinder that is in the exhaust stream, it is angled to, in theory, create a low pressure area that helps draw the exhaust stream through the inlet port, up to the O2 sensor area and out the exit port. It's pretty cool.
FWIW, one other thing I did and I don't know if it helped is that I run open loop, no learn until 1500 rpm. My thought is the higher the rpm, the more consistent the exhaust flow and less likely to have water hit the O2, also, it should be hotter and more likely to flash off any condensation. Like I said - not sure if this helps, not sure if Holley shuts the power off to the O2 if its not in closed loop, but this Bosch O2 has lasted....and I've not had to hook up the PC in over 3yrs. |
Arctic, what about putting a bung where YOU want it. That would seem to be a viable solution. Get your 10 or 15 degrees angle from horizontal and try for 18" from the exhaust valves. Or does Lightning say where you can put the bung?
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Originally Posted by NHGuy
(Post 4702447)
Arctic, what about putting a bung where YOU want it. That would seem to be a viable solution. Get your 10 or 15 degrees angle from horizontal and try for 18" from the exhaust valves. Or does Lightning say where you can put the bung?
Its been said more than once on here that Lightning headers revert water as bad as cast manifolds, I tend to believe that now! |
Smitty,
Have any experience with the KE cast headers with regard to reversion issues? |
I ran O2 sensors on mine full time and didn't have ANY issues in the 30 hours I put on it..
555 cid. cam was 239 / 246 duration Running Eddie Marine manifolds.. They modified the tails by running the inner pipe past the outer pipe They also put a bell on it to throw the water against the exhaust hoses.. https://cimg6.ibsrv.net/gimg/www.off...9df8838571.jpg https://cimg0.ibsrv.net/gimg/www.off...cca141213b.jpg https://cimg3.ibsrv.net/gimg/www.off...654eb851f5.jpg |
OK, I am convinced. I was spouting a lot of car based theory. Which doesn't always fly in our marine environment.
Yesterday I got the chance to run the AEM 30-0300 UEGO gauge with factory calibrated Bosch LSU 4.9 wideband sensor. It idled out and ran 20 minutes to a cove we hang at. Readings were consistent and appeared correct. 13.7 cruise, 11.9 to 12.4 on the secondaries. I'd call that good. Maybe I can go up one size on primary jets to richen the cruise. My carb place sent me some plus 1/ minus 1 jets. So,yuh maybe. My idle mix is rich, so I'll get out there and back that off. And that may have contributed to my sensor shutting down. Here is some theory about fails, one of which is rich fueling https://www.nzefi.com/bosch-lsu-wide...-applications/ But I never had an issue til I let the boat sit for an hour or so, on the next start up the gauge read full lean, and never came back. I'm going to do a test today where the sensor is removed from the exhaust, powered up and fed with brake cleaner or propane from a lighter. It's supposed to go rich when you do that. But at the same time they warn you that the thing gets so hot it can cause combustion. So fire extinguisher. I hope and think that I am getting condensation in my exhaust. It ran in the yard twice, no issues. Including normal exhaust water. My exhaust flappers are gone, and I have GGB exhaust inserts right where the tails go into my 4" rubber hoses. So maybe I need to take out the inserts. But I am guessing that the condensation could have caused my issue. So if the sensor is dead, which I expect, I will probably get a fresh sensor and that extender elbow that I ripped before. That's an instant bolt up, plus it gets the sensor away from the wet. instead of having a bung put in at the angle that AEM specifies. |
Originally Posted by articfriends
(Post 4702591)
Its been said more than once on here that Lightning headers revert water as bad as cast manifolds, I tend to believe that now!
Would love to get header dimensions (ID's and lengths) + rate of fall and a good pic of how water is introduced into the exhaust stream. |
Originally Posted by NHGuy
(Post 4702680)
Here is some theory about fails, one of which is rich fueling
https://www.nzefi.com/bosch-lsu-wide...-applications/ But I never had an issue til I let the boat sit for an hour or so, on the next start up the gauge read full lean, and never came back. I'm going to do a test today where the sensor is removed from the exhaust, powered up and fed with brake cleaner or propane from a lighter. It's supposed to go rich when you do that. But at the same time they warn you that the thing gets so hot it can cause combustion. So fire extinguisher. Water is mixed into exhaust 1" before transom. 230/238 116+4 camhttps://cimg5.ibsrv.net/gimg/www.off...bafa4a0606.jpg |
Originally Posted by NHGuy
(Post 4702680)
OK, I am convinced. I was spouting a lot of car based theory. Which doesn't always fly in our marine environment.
Yesterday I got the chance to run the AEM 30-0300 UEGO gauge with factory calibrated Bosch LSU 4.9 wideband sensor. It idled out and ran 20 minutes to a cove we hang at. Readings were consistent and appeared correct. 13.7 cruise, 11.9 to 12.4 on the secondaries. I'd call that good. Maybe I can go up one size on primary jets to richen the cruise. My carb place sent me some plus 1/ minus 1 jets. So,yuh maybe. My idle mix is rich, so I'll get out there and back that off. And that may have contributed to my sensor shutting down. Here is some theory about fails, one of which is rich fueling https://www.nzefi.com/bosch-lsu-wide...-applications/ But I never had an issue til I let the boat sit for an hour or so, on the next start up the gauge read full lean, and never came back. I'm going to do a test today where the sensor is removed from the exhaust, powered up and fed with brake cleaner or propane from a lighter. It's supposed to go rich when you do that. But at the same time they warn you that the thing gets so hot it can cause combustion. So fire extinguisher. I hope and think that I am getting condensation in my exhaust. It ran in the yard twice, no issues. Including normal exhaust water. My exhaust flappers are gone, and I have GGB exhaust inserts right where the tails go into my 4" rubber hoses. So maybe I need to take out the inserts. But I am guessing that the condensation could have caused my issue. So if the sensor is dead, which I expect, I will probably get a fresh sensor and that extender elbow that I ripped before. That's an instant bolt up, plus it gets the sensor away from the wet. instead of having a bung put in at the angle that AEM specifies. The GGB inserts have a reputation for decreasing reversion. It seems backwards to me but I read it on the internetz so it must be true. |
I've seen/heard the same with Lightning headers. I had them dry to the tip in a previous boat and couldn't believe how wet the collectors would get. I now run CMI's that are +6" tall dry to the tip - they stay nice and dry. My engines are N/A with pretty big cams.
I ran Innovate/Bosch widebands from 2008-2013 and Holley EFI with the standard Bosch widebands from 2013-present. Straight into the bung... Never had to replace a single sensor... I hear good things about the NTK's, but haven't had a reason to change.https://cimg5.ibsrv.net/gimg/www.off...82a60a6b18.png |
Originally Posted by Baja Rooster
(Post 4702701)
Your tail pipe flappers are gone? Is that correct? It’s very possible that your taking waves up the pipes when you’re just sitting there. |
NTKs are definitely more hardier than Bosch.
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Yup, my new flappers are not in the boat, sitting on my desk. I hope it's a problem with the parts. I'd love it if I had a solution like Ryan. I'll order a sensor...
On the intrusion question, I was sitting in a cove. No waves, I mean zero. But I don't rule out that water could condense in there. |
Originally Posted by tgorbett
(Post 4702649)
Smitty,
Have any experience with the KE cast headers with regard to reversion issues? |
Originally Posted by SB
(Post 4702686)
Sure is interesting. I fortget his name, but he had a build several years back with real mild cam and was sucking water bad with those headers.
Would love to get header dimensions (ID's and lengths) + rate of fall and a good pic of how water is introduced into the exhaust stream. |
Originally Posted by articfriends
(Post 4702728)
Was the guy from Va that had a blown single and a big cruiser that had all the distributor problems, rob sheffield. Stock 500hp cam, reverted water to point it also killed all o2 sensors until he put them in header tubes
I'll think of it sometime, hopefully today. I have sometimers and mantimers :) kicking in. :) He was on this board for a few yrs trying everything and everything. He started from no/little knowledge of engines to a good amt during that time period. :) |
Oh, I think his name was Budman. Smaller boat, single, 502, AFR heads, Lightning headers, small hr cam..... I'll search him in a bit.
Phew.......my brain was cramped up trying to remember. :) |
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