Primary TSX O2 sensor

[PR8urvtec]

Welp, I tried the NTK air fuel sensor and getting the same issue. I'm kind of at a loss as to what is causing this. The next step is to put stock injectors back in and put a stock tune on and see if it acts the same way. Although I'm fairly certain that everything is fine in the injector department b/c in open loop the engine idles fine at a stoich a/f ratio. I just don't understand how something this simple is giving so much trouble.

[PR8urvtec]

Anymore thoughts on this issue? I have had the car in open loop since I can't seem to figure this out. Got a used oem sensor and it still does the same thing. The ecu eventually throws a check engine light. I believe it says it's out of range after swaying so far over and over again. It would be really helpful to have the tune using the stock o2 sensor over using open loop.

Does anyone know how the ecu uses the wideband sensor? Does drive by wire have anything to do with it? Maybe using a auto ecu instead of a manual? Being a 5 spd? I'm still at a loss and tuner doesn't know what's going on either. Come on Hondata there has to be some information on this as it seems like a pretty big thing to not work. I've tried 3 different types of sensors and they all do the same exact thing.

[Spunkster]

These sensors are very close together. Have you tried plugging one hole and just getting a reading at idle and comparing that to with both sensors installed?

[PR8urvtec]

I'll see if that helps anything. I did move the sensors to a different location (upstream in the down pipe) to see if the wastegate tie in was affecting the reading and it didn't have any affect. The new location had them spread out further on opposite sides of the piping.

Just to clarify this is a 04 TSX (manual) with a 08 auto ECU with a manual tune from Flashpro. I have contacted Denso to make sure there was no difference between years and auto or manual and they confirmed I have the correct part. Just a very bizarre problem to have but people have used this part and had no issues with what information I've found albeit they are not on flashpro. Just a typical replacement for having a check engine light. I plan on taking a good look at the wiring harness and plug just to see if there is anything that stands but I didn't notice anything irregular last time I messed with it.

[PR8urvtec]

Kind of bringing this back to life.


Spunkster, I have been setting up BBG the last few days and I noticed something odd when I was reviewing a datalog. I have the primary o2 sensor turned off (b/c of the ongoing issue with the primary o2 sensor discussed in this thread) but I am seeing a sporadic S.Trim swing from 0 to -3. Why do you think that would happen if the o2 sensor is turned off? Seems like it should stay at 0?

(Update to this thread)
I talked to a friend today and he said that when he used the 07-08 auto ECU he had the same issue as I am with his o2 sensor not idling the a/f ratio in closed loop, and when he switched to a 07-08 manual ECU he didn't have the issue. Is there anyone at Hondata that can at least look into this? Not really sure how the transmission type would even effect this. The wideband sensors are the same between the two according to the part number from Denso.

[Spunkster]

With everything plugged in and the ignition in the on position, go to the Help menu and click on “send feedback”. Include a detailed description of the issue.

[PR8urvtec]

Thank you. I will do that this evening.

[PR8urvtec]

With everything plugged in and the ignition in the on position, go to the Help menu and click on “send feedback”. Include a detailed description of the issue.

This was done when asked. Please note the date of previous post.

[Spunkster]

What is the FlashPro serial number?

[PR8urvtec]

FF-TSX-US-90513

[Spunkster]

No feedback was ever received from that serial number.

[PR8urvtec]

I just sent it. Idk why it wouldn't have sent the first time to be honest.

[PR8urvtec]

Spunkster my man. What is going on with this. Drove my car home and the - 10% Strim is gone and my fuel map is screwed again. I don't even understand how this is happening. I just finished tuning it and now it's messed up again. The most frustrating piece of engine management I've ever dealt with in 20nyears of messing with Hondas. The software also crashes and has tons of trouble updating when a new version gets released. I don't know what else to do but step away from Hondata products bc this cost to much time and money to have this kind of issues. There has to be something to make this work. See the attached pictures to show the weird mysterious -10% Strim is gone and you can see my fuel tables are phat. Can't use closed loop and fuel won't even be consistent. I'm pulling my hair out at this point.

[Spunkster]

I suspect there is something specific to your vehicle that is causing this as no one else is having these issues. I also do not have an easy answer as to what might be causing this. Perhaps you have leaking injectors or have the wrong dead times set for the injectors being used.

[PR8urvtec]

I suspect there is something specific to your vehicle that is causing this as no one else is having these issues. I also do not have an easy answer as to what might be causing this. Perhaps you have leaking injectors or have the wrong dead times set for the injectors being used.

Idk. My friend Justin who has a comptech s/c tsx said he had the same issue with his primary sensor and moving to a manual ecu was the fix.There aren't a lot of turbo TSX's running around and even less manuals. Not sure what capacity you are talking about when you say you've never seen another one doing this. How many TSX's have you looked at in depth to know?

I'll look over the fuel system again but this issue was before and after I converted to a return fuel system. I've searched for fuel leaks. Fp stays steady and I don't smell raw fuel. The dead times are from the fuel injector manufacturer and reputable brand. I've only used Injector dynamic and fuel injector clinic. Never ran the car on ethonal but I'm willing to explore the fuel system again if you can explain how that makes the Strim turn on by itself.

I understand this is a strange thing but it does not explain why putting the car in open loop a/f solid at my target and putting it in closed loop the sensor can't find a stoich a/f at idle at all. And used 3 different brand sensors all with the same result. A fuel leak doesn't explain why the Strim at one point showed a - 3% Strim and then a year later has a - 10% Strim randomly while in open loop and 2 days later the 10% trim is no longer present and my fuel is 10% rich all over again. I highly doubt well known tuners that are well versed in Hondata would over look something as simple as a fuel leak. There has to be some sort of logic in the ecu that is making this change bc when I let off the gas and fuel cut overrun activates, the 10% trim goes away until the over run stops then it comes back. Now the trim is completely gone again. I just used the overall fuel trim parameter to offset it as a whole.

I'm willing to send you guys my ecu and flashpro to see if you can figure it out. I've checked wiring harness and all of my systems. I've been trying to figure this out for years at this point. My last resort is to just 0 out the trims and have to keep the car in open loop which isn't really ideal and shouldn't have to do this.

Again, if you all can release the wiring schematic to run dual ecu with kpro I'd go that route and move away from flashpro as it's very limited in general. I don't see why that would be an issue since you all discontinued the item long ago. People are j swapping and converting them to manual. Even has port is exploring thus chassis more to this day. We have cl8 awd accords as well so there is a market for its return.