12-23-2020, 02:44 PM | #45 | |
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The change was drastic, night before I drove it and it was fantastic, then woke up drove it to gas station, actually drove at speed on the highway, probably 80-130 mph and no problems. got off the exit , pumped gas, got back on the highway and immediately had the issue. I've now gone through half a tank of fuel. I will take logs and report back but I have to learn how to use them. I'm going to read through threads. You guys are so helpful I don't want to ask how to take logs also. I'll just search it and report back :-) you guys are awesome! |
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12-23-2020, 02:48 PM | #46 | |
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https://f30.bimmerpost.com/forums/sh....php?t=1732327 No need to go digging for other threads |
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12-27-2020, 09:49 AM | #47 |
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Glad Im not the only one with this issue. Definitely feels like its lugging and just needs to downshift. I also tried the trans tune in BM3 and it just didn't drive well so I switched back to stock.
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12-27-2020, 11:21 AM | #48 | |
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Soon i'll configure the shift points to achieve the smoothest drive possible and will share the configuration once it's ready. |
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12-29-2020, 03:09 PM | #49 | |
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Has anyone tried datalogging using their iphone? I did a few pulls at high speed which is where I was most noticing the issue. Then I did a 4th gear pull instructions 2500rpm to 6500rpm - OMG all heck broke loose, drive train malfunctions galore! I attached a pic of the codes it threw. Not sure you guys can help me until I have proper logs... |
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12-30-2020, 07:09 PM | #50 | |
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this is a 2014 335i EWG I'm on the Stage 1 91 flash right now. 53,000 miles. spark plugs and coils are maybe 5k miles old. Turner open intake, ER chargepipe, megan supremo exhaust. 2 logs are below https://www.bootmod3.net/log?id=5fed...90c67c6b367567 https://www.bootmod3.net/log?id=5fed...729b406cb65d91 The car ran flawlessly on Stage 1 93 oct for a few weeks and then all of a sudden I got this issue. I flashed to stock tune, ran normal. Flashed to 91 Oct, has the hesitation again. Help Please :-) and thank you! |
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12-31-2020, 02:33 AM | #51 | |
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Swap coil of cylinder 6 to 5 and 5 to 6 then run the diagnostics. If the misfire didn't follow to cylinder 5. Try the same the procedure with spark plugs. Also check the coils connections. If all good, fill the tank with Chevron Techron Concentrate Plus injector Cleaner and run it for 2 cycles. If the above didn't work. you need to check the injector of cylinder 6. If you're staying on stage 1 for a while, i'd suggest using OEM bosch plugs in the case the existing plugs are NGK. Many has reported misfiring issues with NGK 1-step colder plugs on stage 1. At which speed and gear range does the hesitation occur ? WOT or partial ? Last edited by Wiz992; 12-31-2020 at 12:54 PM.. |
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12-31-2020, 02:21 PM | #52 | |
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I'm going to have my shop just replace all of the spark plus just in case. I'm going in anyway on January 8th for catless DP install. I went ahead and did the injector cleaner today anyway. The speed ranges, it's the RPM range where it's constant. 3000-5500 rpm. It's a hard jerking from the engine bay. I would say it starts at about 50% throttle. When I went WOT I started throwing codes. |
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12-31-2020, 02:48 PM | #53 | |
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That's good.85% it is ignition/injectors issue. Just make sure to swap the coils of cylinder 6 and 5 to rule them out. It's an easy DIY, you can do it by yourself even before going in for plug (If this is your daily car and need a quick fix) |
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12-31-2020, 05:17 PM | #54 | |
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Thank you! |
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01-04-2021, 08:23 AM | #55 | |
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I don't understand a lot of the technicalities yet of the tuning. I know that it's much more advanced and changes different parameters not just boost targets like my old piggyback BMS Stage 1 - but I guess my question is, How come when I flash to stock the car has no issues? Wouldn't the misfire/bad coil/bad spark plug/ bad injector follow whatever tune I'm on? How come it's just on the Bootmod3 tune? Again, total noob over here lol asking what is probably a total noob question |
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01-04-2021, 08:41 AM | #56 | ||
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I would think that the problem could correct itself by going back to stock, if the plugs in their condition/gap/brand are having a hard time with the tune. I am still on oem plugs and stage 2 with no issues there. However I TOO got some "bad gas" and it ran havoc on my timing. No codes or cels though. Been using shell 93oct with a gallon of e85 and my timing is perfect.
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01-04-2021, 11:19 AM | #57 | |
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Whenever you have a misfire on specific cylinders to the point of getting drivetrain malfunction, one of the first things you do is try swapping plug/coil from a misfiring cylinder to a non-misfiring cylinder to see if the problem follows the parts, as mentioned above. If its not plug or coil, it could be injector. |
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01-04-2021, 02:02 PM | #58 | |
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01-07-2021, 11:07 PM | #59 |
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I did all the maint I had built up. New plugs, new IC, tranny fluid swap, diff fluid, front thrust arms. It really didn't take too long.
The shudder is still there but not as bad. Im going to do the BM3 tranny flash again this weekend and see how it goes. It didn't work too well the first time so Im curious what it will do now. |
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01-08-2021, 01:54 AM | #61 | |
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You need to mitigate the load on your car by adjusting the gear upshifts/downshifts to smoothly cope with the requested torque. You need to go for TCU custom tune or reduce the torque request. Cheers |
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01-08-2021, 01:59 PM | #62 |
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Shift points configuration - Shudder fix on low RPM/partial throttle
Hi guys !
So for those who are experiencing vibrations at low RPM on partial throttle (Usually from 4th to 8th gear), if you already have examined the ignition coils & spark plugs, injectors,O2 sensors, vacuum lines and CP, Flex disk and centre bearing, engine and transmission mounts, wheels, the right octane as per your tune, no engine codes and the car runs fine on stock map, you can proceed with TCU tune. In case you wanted a cheap fix and you own ZF HP8 transmission (F30/F32/F33), you can purchase XHP license only (183$) and alter your up-shifts and down-shifts as mentioned below (Configured by me and the car now runs smooth as silk, the shudder is 100% eliminated, no lugging, auto gear shifting is more responsive and the load on drivetrain is reduced to 80%).
The above configurations is for D-mode. For S, to be updated later. Please note that, these adjustments is based on TCU stock map All the best ! |
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01-20-2021, 11:10 AM | #63 |
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So quick update guys, new coils and NGK plugs installed along with Active Autowerke catless downpipe and did the OFHG that was leaking while we were at it (gasket and labor covered by aftermarket warranty :-))
Flashed to Stage 2 AGR my mechanic took her out this morning for test runs and datalogging and all is well. The hesitation/jerking is gone. I think it was just one of the coils that were bad. By the way he ran hard 4th gear pulls before the coils were replaced, had the nasty hesitation but the car never threw codes again. Needless to say, I am very excited to get her back this afternoon! woop woop! |
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01-21-2021, 12:42 PM | #64 | |
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01-21-2021, 10:57 PM | #65 | ||
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Turner Intercooler and xHP flash next. And then I'm done... for now |
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