Hondata

I am using kpro v4 for my k24a2 swap in my base 03 rsx. the ecu is from the base. car is dyno tuned and has been running great for thousands of miles. about 2 months ago the car gave me an issue. i would start to feel a slight hesitation when giving it gas right after an upshift. a day or so later i was driving home from work and the afr would pin the wideband rich and it would break up. i managed to limp it home. battery voltage was good, no dtc etc. i reuploaded the kal to the ecu and it fixed the issue for another thousand miles or so. well it happened again twice now in the past few weeks. not sure whats going on here, but so far the fix is to upload to ecu again, which requires me to always have the laptop in the car which isnt going to happen. any ideas on causes here? ive had something similar happen before when a map sensor went bad but i have no codes...is it something up with the ecu??
thanks
-matt

instead of uploading when the problem occurs, just unplug the ECU and plug it back in, or pull the battery cable. If that fixes it, it sounds like you may have a bad O2 sensor and the fuel trims are getting really high.

thanks for the reply spunkster.

the car is actually running open loop off my tune. just have a wideband which is logged in the kpro. i will try unplugging the ecu and checking those connections.

any other ideas or similar stories that have been debugged? is it possible the files are getting corrupted somehow or the memory in the ecu is the culprit?

the first time this happened the afr was only bad between 2000 and 2500 rpm but it would break up so bad i really couldnt rev through it. this past time the afr went rich across all rpm and it died on me while i was going 60mph on the highway. i managed to get it restarted and kept the revs up like a ricer until i could get off the road and re upload.

You need to datalog when this occurs to see what is actually going on.

i know. last time i was just trying to get the car restarted and off the road since i was in traffic.

it happened again the other day on my way to work. next thing you know i look at the wideband and its in the 11s just cruising. i had to lightly feather the gas too keep it running and in the 1 minute it took to plug in the laptop and turn it on to datalog for a second it totally died on me. i re uploaded the tune and it fired right up and ran fine. i dont know how it can be anything mechanical or a bad sensor since it clears up with a re upload. id have to guess its something with the ecu or software/kal. i attached the datalog and what im pretty sure is the calibration it was running. i didnt have enough time to open the calibration while datalogging and trying to keep it running and get off the road at the same time before the car died on me.

It is strange that after the vehicle has stopped moving and the engine is dead that it is not reading atmospheric pressure. IT is actually still reading vacuum. You might want to try your map sensor in a known working vehicle first to rule that out as part of the issue. This does not sound like an ECU issue. Also have you tied what I suggested before and instead of uploading to the ECU when the problem occurs, just unplug the ECU and plug it back in to reset it.

Thank you for the help with the old troubleshooting process. i didnt try to unplug the ecu when it happened last. it was at like 615am in the dark on my way to wor. i haven't driven the car since. the car died but the ignition was still on you can see the vss as i rolled to a stop then shut off the ignition. something is up with the sensors either map or tps im pretty on board with that whether its a cause or effect im still not sure. at one point in the datalog its running at 6" vacuum with only 19% tps and 80% calculated load. i feel like i would need a decent amount more tps to hit that 6" value (unless of course the extra fuel in the cyls is altering the map sensor accuracy). i have a spare working map and tps sensor i put in the trunk that ill swap on if it happens again right after unplugging the ecu before i re upload.

if either of those sensors is the culprit, im still unsure how re uploading the calibration can fix the sensor itself because the car immediately ran fine again after the upload. if the sensors parameters (max/min voltage) in the tune changed and needed to be reset i would understand but that would be something in the software...

other quick question. if i had an injector that was sticking open, is there any possible way that re uploading the .kal could fix that? or is that strictly a mechanical issue. my #1`cyl was a bit cleaner of carbon that the others and its not because of coolant in the cylinder(no smoke, good leakdown, stable coolant level, no fluid mixing etc) thanks again

-matt

Please try what I have suggested, as it will help determine a little more about the situation.

I will. i put the other map sensor in today and will have the laptop on the whole time im driving to try and get another solid datalog. before I re upload i will unplug the ecu to reset it.

had it happen again the other day. this time it was not as bad just rich at idle and light throttle. i have pretty long datalog of me driving around my neighborhood which is where it happened. i got home and turned the car off. before disconnecting the ecu i fired it back up and the issue was fixed with no uploading or doing anything but turn it off then right back on. i have the new map sensor installed when then went down for what its worth.

At what point in that datalog does it happen?

From the calibration I see that the wideband has a lot of offset (-.22V), which can mean there is a ground loop or similar affecting the wideband output.

Car is running in open loop. Do you have the stock o2 still?

the entire datalog the issue is present. It can be seen most prominently in the idle and low throttle afr. i have the wideband set to that offset to have it calibrated to the dyno wb when it was dyno tuned. it was close but i set it to get the 2 sensors spot on. the stock o2 sensor reads a few tenths richer actually, but i have it removed as the car runs in open loop. I have had the wideband wired in this manner the entire time i had the car together, and went over 8000 miles with it before this afr issue surfaced


I have a lot of time into this driving around street tuning, all of which time was with the live tuning enabled. is it possible that the memory on the hondata board is full or filling up from that/lots of datalogs that could cause it to act funny?

We don't recommend keeping live tuning on unless you're actually using it.

If I may post as well in regards to this issue because I am having the same problem and need some help I could say I’m partially right but can’t solve the problem… I have a 07 Si k20z3. AEM fuel pump new, RDX injectors new, so got dyno tuned everything was OK for a while but recently I gave de fuel pump modula some cleaning and left it like brand brand new. After that I noticed the car was getting more gas to the engine because it felt faster, I thought that was cool. But a problem happens when I would get in high RPM’s at 8k I noticed a bogged and it never did that after the dyno tune. Well once again, on a different day but gave me a misfire cylinder 1. So I gave it a tune up changed the coils as well as the injects to other different cylinders. After the tune un the misfire was gone but had not looked at my hondata App since I cleaned the fuel pump modula, wires connectors and hoses. So after I noticed stuttering and bogging instead of advancing I did see my A/F was at 10.1. Had drove it like that like 2-3 days and could not any longer tunner sent me a new map because could not get off 10.1 and there was an adjustment right away but after I tested the car out from having the correct 14.7 I gave it gas to try and redline and at 6k it cut off bogging and jerking (not advancing) till it died out. Turned it back on and had A/F of 10.1 again. Barely made it home. Tried putting the K&N v2 base map to see if that would solve the problem but was the same issue (pretty much). So I can’t figure it out. (All this started happening after I cleaned the fuel pump modula) and there’s nothing wrong with that only having the miss-adjustment of my dyno because of more gas flowing in but wouldn’t taking the tune off solve the problem??? Anyways I finally took off the new spark plugs I added and they were all blacked out. Possibly from those 3 days driving to work with A/F ratio of 10.1 and not noticing so i cleaned them and put them back. Turned on the car only with the base maps and had 14.7 at idle but when I took off I got stranded the car shut off when I had the foot of the gas and had gone lean completely. After turning it back on and barely making it home I checked the dyno tune and was at 10.1 again after I DID clean the new spark plugs that were black. So my question is do you think most of this problem could be getting caused not only by the riched used spark plugs but also the oxígeno sensor that possibly got supper dirty as well as the spark plugs and now it’s causing the problem? I have datalogs, picture, videos to share??. Also said that the trim was -31 and I had Map of 3psi! But I don’t even have turbo. Can anyone please help here? I really am at a loss? Please