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-   -   S55 E85 BEF cold start issue (with log) (https://www.n54tech.com/forums/showthread.php?t=54980)

corbs09 09-11-2018 10:56 AM

S55 E85 BEF cold start issue (with log)
1 Attachment(s)
Hi guys,

My car doesnt like to start after sitting for a while on 100% e85. I am running the e85 BEF and the most recent firmware of jb4 with future use D bit 2 turned on for cold start fuel enrichment

The car will crank, try to idle and die within 2-3 seconds. It did this twice. then on the third try I have to "help" it with the gas pedal and it will sputter then start and act fine the entire time I am driving it.

Can anyone see anything weird or off within the log itself? This has been driving me crazy.

Terry @ BMS 09-11-2018 11:19 AM

We'll have to find the cranking tables and adjust those if FUD.2 isn't doing it. What's the weather like there?

corbs09 09-11-2018 11:26 AM

Ambient is about 75*. Relative humidity is around 70%.. not sure if that makes a difference.

It has been raining all week, but the car is always stored indoors. Let me know if there are any additional logs or tests you would like me to do.

Terry @ BMS 09-11-2018 11:33 AM

Nothing major there, strange we don't have any issues with ours now with the FUD option. Where previously, it would do something similar. I'll move this thread to the //M support area so I remember to follow up later.

corbs09 09-11-2018 11:47 AM

Thanks... I remember back from my Evo days that when the ambient was below 50* it wouldnt start, or didnt want to at least.

Terry @ BMS 09-29-2018 09:11 AM

Made an update to the BEF that should improve cold idle on E85. Posting it to the BEF thread shortly.

corbs09 10-16-2018 08:04 AM

Hi Terry,

Thanks for the update. I actually switched back to the RACE BEF (loaded it on 9/26) on 93 octane but am still experiencing the cold start issue. On cold start, the rpms will wander between 300 and 1300 and sometimes even stall. Same thing it was doing with the E85 flash.

Should I reflash, look at something hardware wise, or is this just somewhat normal operation for a flashed car?

Thank you!

Terry @ BMS 10-16-2018 08:17 AM

Email me and I can make a similar change in the RACE file to test.

corbs09 10-16-2018 09:00 AM

Done, thank you sir!

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