RPM fluctuation at idle
I have been running my EFI for some time and after tweaking here and there I am 90% satisfied. I am working in two issues right now. The fluctuating idle has baffled me for a long time and have not made improvements. I rerouted and protected the ignition wires to reduce the chances of interference and made no difference so I am at a lost.
When in idle the RPM fluctuates between high 700s to low 900s. The setting is at 820. I have tried different AFRs and different idle RPM with no success. I have had the idle IACs at various values between 3 and 10+ with no difference.
I am uploading several logs I have been making during my troubleshooting at different target AFRs. You can see the RPM fluctuating and so the IAC and AFR. I have also made slight changes to the idle PID, but not much difference.
PS: I had to change the file extension from CSV to PDF. Whoever looks at these files need to change the file extensions back to CSV for them to work.
Thank you.
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I had a similar idle fluctuation on the wife's car that I put the go efi 600 on. I reloaded the latest software and loaded it on the ECU and it fixed it.
Which software update or version did you add? I reflashed it earlier this year with new software.
I updated in June. Version 30002.30001 T198i
Yes, that's the version I have, T198.
Any more ideas?
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The fluctuation I had was much worse than that. Don't know what to tell you, maybe vacuum leak? Might be useful to plot out some more stuff like vacuum. Wait a minute, does your version have the "i" at the end? I think the older version didn't have the "i".
In my first post I uploaded about 5 files. I charted two of the files with RPM and vacuum. The vacuum is fluctuating with the RPM, which I expect since the vacuum should go up (minus in the chart) as the RPM increase.
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I would look at all parameters and see if you can find where something else is triggering the change in vacuum/rpm. It's kind of difficult to assess remotely like this. Something is causing the instability. So is your version with the "i" at the end? You never responded to that.
Quote from bdhulderman on September 19, 2019, 9:19 amI would look at all parameters and see if you can find where something else is triggering the change in vacuum/rpm. It's kind of difficult to assess remotely like this. Something is causing the instability. So is your version with the "i" at the end? You never responded to that.
You are right. I don't have the "i" version. From what I read in this forum, the latest version just has the mod for the water temperature offset. However, I could give it a try. Where can I download it from? I have the "no arrows" unit.
In regards to the parameters, I did a lot of plotting and haven't found one that jumps out.
Here are the instructions:
Yeah, it says it just includes the temp sensor update, but it worked for me.