Hello, I have been having this issue for months now and can't figure it out, did changing out the pr coils with stock ones resolve the issue?
Motiv Flex Fuel Installation Guide
- Thread starter doublespaces
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Same problem Eca voltage spikes randomly and ethanol as well. Every wot pull it’s goes crazy at idle it jumps around.
Sorry if you have already answered this previously but what is the colour of the wire you ended up using for your power? I have mine in getting tuned and have the same voltage spike issue and I am not in front of my car to look at the DME and confirm what wire I am currently using. Hoping your solution will solve my issue
They're both orange. There are 2 wires on that connector and one provides a clean stable signal while the other doesn't. I ended up trying both and it was pretty obvious which was which, as the bad one gave fluctuating results immediately.
Neither one gave me none fluctuating results. And I have Delphi coils.
Mods - 2012 335is
Car is full fbo. i/c, charge pipe, 3.5 bar,
j pipe, turbo outlets, turbo relocated inlets, Walbaro 450, dps, secondary delete, ngk plugs and Delphi coils everything else is stock.
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Yeah sweet, I pulled it apart and had a look and swapped it over, the other 1 did exactly as you said and jumped around wildly. I put it back to the original wire but still have the issues when WOT. I have emailed Motiv with the data log so I guess I'll have to wait and see
Yep! I got off a chat with the Motiv guys yesterday and they said it is an issue with the PR coils, I'm going to test stock coils and see if that fixes the issue. It is pretty annoying if there is a known issue and they don't publish it
Same. I'm actually making a YouTube video warning people about it. It's kind of BS.
I was super resistant to it, because I didn't want to replace a part that wasn't broken, and I didn't want to spend money needlessly and without the guarantee it would fix my issue. I did end up replacing them with Eldors though and it DID fix the issue. So at least that's nice!
F*ck that is bittersweet, annoyed I dropped $500 on a set of coils that I can't use but at least it may solve the problem. I cannot for the life of me work out why Motiv don't publish it, the Motiv guy knew straight away what the issue was. His response to me was 'it only happens with PR so we stopped looking at what the issue was'
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What if you are not running a secondary pump?
I'm getting spikes even at idle. Not as bad as during a pull but I cant seem to figure out what is going on to cause the spikes. It is a motiv reflex plus with i/o integration. Seems like for the money it would be a pretty solid setup.
I can't say that this will definitively work, but you should try connecting to the other power wire on the connector the Reflex pulls power from. If it's anything like the Motiv Flex Fuel Module, it pulls power from a green connector that has 2 orange power wires on it. From my and others' experience, one of those wires is super noisy and causes ethanol spikes constantly. The other wire is cleaner and will hopefully fix your issue. Try it out.
I will definately try that out tomorrow.
Thank you for the suggestion. I hope it turns out as simple as that. I'll try the direct to b+ also if that dosent work. And yes I have PR coils like the others mentioned. I hope it does not come to having to remove them. I havent had them long at all.
The other orange wire is a big NO NO.
I switched it and the car did not like it at all.
Cut fuel on bank 2 and ran way lean.
Misfiring and just not happy at all.
I stopped on interstate and switched it back and it ran fine. Still getting spikes though on ethanol reading. I'm going to pull these pr coils and see if that does anything.
Any update on this?
I’m in the same boat. Ken said there may be some interference so I narrowed it down to a ground issue or voltage issue but haven’t tried switching the wires. Running ngk coils, and a stg 2 lpfp. nothing special
I'm having an issue I haven't seen mentioned yet. E-content is showing a steady E20-E21 with voltage at 1.00 to 1.01, I've only filled with 93. Max for 93 here is E10 and after a couple of logs, timing is all over the place (no issues with my previous custom 93 tune). Although, the ECA reading is consistent and stable at WOT. Just seems to be offset by at least 10%. Tried two new continental sensors, no change. I wonder if the FF box itself may be faulty
Tested it, E10 all day while MHD shows 20-22%. Checked pins, tried different power/ground and its all the same. Added some e85 and the content rose accordingly, just seems to be offset by 10% or so.
Just tested mine today too. I'd been just kind of hoping the fuel around me was crazy high in ethanol... it's not. ~E8 by the tester, E21/22 by the ECA. So now that comes to 3 issues I've had with the Motiv Flex Fuel, straight out of the box. Pretty fucking tired of this thing, but of course I won't be getting my money back.
Have you messaged the owner to see if he has any insight? He seems to know all these issues exist, what causes them, and how to fix them, but doesn't tell anyone until they ask. I'm sure he's sick of hearing from me by now.
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