1500 rpm rich condition
Sep 23, 2018, 03:09 PM
#1
1500 rpm rich condition
Hey guys i know this is random but i just dont know what to try. I put the car in open loop because i cant figure out a lean tip in issue in closed loop and the car drives awesome except for around 1600 - 1700 rpms or so the car goes rich all the way to low 12 some times high 11. When rpms pass that point it goes back up to normal. This is cruising in any gear. Even revving the car. Im on sd tephra v7. Ive tried lowering rpm ve, map ve and maf comp at appropiate value and nothing. I dont understand what im missing? Anyone have any idea?
Nov 5, 2018, 07:46 PM
#7
Thats the thing, nothing works. I tried map ve, rpm ve, fuel table, maf comp, i even tried accel tables for the hell of it. Pisses me off that i cant figure it out. Im even thinking maybe its mechanical? Just hoping someone has had this issue before or gives me an idea. In this log you can see when it reaches around 1700 rpms it goes into the 12's and then it goes right back to normal. I attached my rom for the hell of it. Maybe someone catches something i missed.
Last edited by nor11384; Nov 5, 2018 at 08:16 PM.
Trending Topics
Nov 14, 2018, 12:11 PM
#9
EvoM Community Team Leader
it could be mechanical, you should eliminate that possibility before continuing to chase your tail in the tune.
Nov 14, 2018, 08:00 PM
#10
thats what i thought but what can cause this mechanically? I mean its in the sam espot every time. If im cruising i can actually hold it at that rpm say 4th or 5th gear 17 - 1800rpm and itll just be rich until i let rpms drop or accelerate past that point. If im taking off in first and accelerate past that point you can see afr drop once it gets to 17 - 1800 rpm then jump right back up to where its supposed to be. I thought maybe some random option in the rom but ive tried a bunch of things and nothing works. if something comes to mind please say it and ill try it.
Nov 14, 2018, 08:18 PM
#11
thats what i thought but what can cause this mechanically? I mean its in the sam espot every time. If im cruising i can actually hold it at that rpm say 4th or 5th gear 17 - 1800rpm and itll just be rich until i let rpms drop or accelerate past that point. If im taking off in first and accelerate past that point you can see afr drop once it gets to 17 - 1800 rpm then jump right back up to where its supposed to be. I thought maybe some random option in the rom but ive tried a bunch of things and nothing works. if something comes to mind please say it and ill try it.
Nov 14, 2018, 10:10 PM
#12
This isn't a easy fix. I had that issue and was basically a combination of SD Map/Load, SD VE and High Octane Map. I wasn't able to open your ROM File because I actually have only the 8859 data. If you can include your metafile I could be able to help. Are you running SD? What injectors and engine combination do you have?
Nov 14, 2018, 11:40 PM
#13
EvoM Community Team Leader
so this only happens in closed loop right? You said RPM is consistent, what about load? What load is this happening at, and what do your LTFT Mid and Low look like? Log your front 02 sensor and your wideband when it happens and see if the 02 sensor is behaving in a way that tracks what you are seeing on the wideband. Obviously it wont match 1:1 but if you see rich on the wideband volts should drop on the narrow. Also log STFT, what is the ecu doing, dumping in fuel, pulling some out etc?
Nov 15, 2018, 05:06 AM
#14
Try the small changes I did. Verify your taking off AFR and the rich spot you are uncomfortable with. Besides, log more data at least until 3500RPM along with the AFR to that point. I would like to see the behavior of the car until that point.
Nov 15, 2018, 08:00 AM
#15
This happens only in open loop. Closed loop it doesn’t do it. I can’t run closed loop because no matter what I do the lean tip in on take off is there and I almost got hit the other day because of it so decided to run open loop. On open loop everything is fine but I just have this little issue. I’ll check out the adjustment you made jmedina and get a longer log just cruising going through the gears.
now, I run 9417 and it seems like every time I turn on the car it does something different...I’ve heard of this happening with 9417. I was also thinking of switching to 9653 but that’s another story. Would like to get this issue sorted out.
now, I run 9417 and it seems like every time I turn on the car it does something different...I’ve heard of this happening with 9417. I was also thinking of switching to 9653 but that’s another story. Would like to get this issue sorted out.