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Viechus Viechus is offline
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Default Help Need: 2F91 DME - 06-15-2020, 02:19 AM

Help Need: 2F91 DME: Engine-speed limitation with vehicle stationary

Description: Having this issue, when flooring pedal to the metal, half check engine light up, engine start to rattle, shake for 1-2 seconds and reduces power, then goes again.

JB4 give the code but says: 2F91: No description

Running: JB4 Map 7. with MHD BEF (E85 map), in tank E40% E85 mix.

LPFP: ~67, 68
HPFL: ~11 when flooring
Trims also look ok.
Have problem with IAT what is reaching 100-115 F

Upgrades:*** les DP, Straight pipe, Stepped IC, 2 step colder spark plugs, relocated Inlets

Additional: Have o2 sensors behind *** not working properly, but do not think it is the issue, have it for some time.
Also, speedometer is not always running (showing speed) have code 2F4F Vehicle speed, plausibility - but this code I have for long time and speed not showing (as ABS, DTC etc have switched off permanently for drift reason)

I tried to switch different maps, but the problems remains

What could it be, for making this engine power loss?
Attached Files
File Type: csv P32_M5_R2_200614_2124.csv (287.8 KB, 45 views)
File Type: csv P32_M7_R2_200614_1950.csv (412.5 KB, 44 views)
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 06-15-2020, 05:54 AM

Logs are massive & aren’t loading correctly for me.

Can I see a log 2k to redline, WOT, 3rd gear, traction off


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Viechus Viechus is offline
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Default 06-15-2020, 06:16 AM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Logs are massive & arenít loading correctly for me.

Can I see a log 2k to redline, WOT, 3rd gear, traction off
Hello, Thanks for replay.

I will make them, sure. Should I make several (separate) with different map selected, 2,5 or 7? or which much You would say I preferred to do?
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Default 06-15-2020, 06:23 AM

I wanted to also add that I had this problem as well when I was running JB4 map 2, with MHD BEF (Pump) and pump gas (98 octane)
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Default 06-15-2020, 09:14 AM

Here is log as You asked 3rd gear, from 2k rpm till redline.
there are 2 pulls. this time there was no error during them.
but maybe You already see something wrong in there, let me know.,

Thanks in advance
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File Type: csv P32_M2_R1_200615_182930.csv (86.3 KB, 46 views)
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Default 06-17-2020, 10:45 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
Logs are massive & arenít loading correctly for me.

Can I see a log 2k to redline, WOT, 3rd gear, traction off
Hi, I have switch JB4 to MAP2, MHD BEF (pump), pump gas and then made a pull on 3rd gear.
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File Type: csv P32_M2_R1_200618_074340.csv (20.2 KB, 46 views)
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