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**First Time Tuners** Start Here** Official Misfire Thread| Updated!
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03-11-2018, 06:07 AM | #309 |
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Forgot to mention, had also replaced bank 2 pre-cat O2 sensor (cyl 4-6; it was accidently damaged during downpipe installation). Also want to emphasize, misfire only occurs when engine is cold, almost always on cyl 6. Once warmed up, WOT is fine. Sound like an injector, I know, but injector swap/replacement did not affect the problem.
Last edited by dpaul; 03-11-2018 at 06:13 AM.. |
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03-11-2018, 10:31 AM | #310 | |
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Guy's I've also been through the misfire nightmare. And totally understand the frustration your dealing with. What resolved it after I went through new plugs, coils, and ebay injectors was pre-cat O2 sensors. If you have misfires on 2 cyls on the same bank and your car has close to 100-120K you should look at the precat O2 sensor on that bank. I'm no mechanic but it fixed it for me. I did not have any codes that lead me to believe it was an O2 sensor. Just the fact that I had multiple misfires on Bank 2. cyl4 cyl5 and cyl6 at different times and often 4 and 6 at the same time. Look at your old history and see if you have misfires related to the same bank.
Also please post what your fix is after you have nailed it down. Way to often people fix the issue but never report what actually fixed it. Misfire issue on our cars could be 20 different factors and a real pain to troubleshoot. Just curious if you reset your adaptations after replacing your O2 sensors? I think this helped my car. Not sure this is necessary as your now running catless DP's. Quote:
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03-12-2018, 12:13 AM | #311 |
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I have couple of questions:
1. Are coil packs bank/cylinder group specific? Can I swap one from any cylinder to test with another? 2. Just to make 100% sure, no coding needed after new coil packs are installed, correct?
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03-12-2018, 10:31 AM | #312 | |
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2) no coding required for coils. Your thinking of fuel injectors. |
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03-12-2018, 10:41 AM | #313 | ||
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03-25-2018, 03:59 AM | #314 |
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I'm new to this platform but have about 15 years of experience with tuning cars. I just picked up an 09 335 xdrive, I installed MHD and did some logs of a stage 0 tune and my AFRs are in the mid 13's under boost and I'm getting timing correction on all cylinders. I just want to get some input from my logs.
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05-31-2018, 07:00 PM | #315 |
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I have been having some drivetrain issues (maybe) and am too much of a noob to create my own post at the moment. My car took a dump on me a month ago and as I've been waiting for my Spec stage2+ clutch kit and MFactory SMF to come in, I installed bolt ons, MHD tune and koni shocks and struts replacing all bushings on the way. I took my car to BMW of SD for a diagnostic when I suspected the clutch went out (Huge clank with a drop feeling) accelerating after a turn. I did the clutch and with my rear tires up, went through reverse, 1st and 2nd gear smoothly it all sounded good. With the car on the floor, I get this clanking sound coming from where the driveshaft meets the rear differential and cant really accelerate. Somebody help please!
Thanks here is a video of the issue with general description. |
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06-15-2018, 12:31 PM | #316 |
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The misfires and other problems on these cars is exhausting. The amount of time I spend replacing coils, plugs, injectors, vanos, water pumps, crank position sensors is 10 times what I spend on my FORD Mustang.
Mine is now misfiring mostly under light load or at idle. Most of the time it behaves well under WOT conditions. I replaced the valve cover gasket (was leaking pretty bad) all the plugs, coils and the exhaust Vanos. I cleaned the intake Vanos. It is better, but the car still misfires pretty bad sometimes. It doesn't seem to be consistent. Some days are good and some are no so good. I think hot days seem to be the worse.
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2008 335xi - JB5 ISO e50, VFSR catless DP, DCI, VFSR FMIC. Fuel it stage 1, VMR V710s. 407/446 rwhp/rwtq.
2004 Cobra - Basic bolt ons with a tune. 450rwhp/rwtq450. Port coming soon. 2013 X5 50i - muffler delete, xHP tune, ESS tune on the way. 2016 Mustang GT Roush Phase 2 with VMP 767 HP kit. |
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06-15-2018, 01:03 PM | #317 | |
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2011 E92 335is, Space Grey/Coral Red, 6MT.
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06-19-2018, 05:12 PM | #318 |
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Persistent Misfire in Cylinder 3
I'm getting a persistent misfire in cylinder 3. New plugs, new coils; swapped new plugs and coils in cylinders 3 and 1; misfire stays in cylinder 3.
Time to replace injectors? Looks like my current ones are index 7. 126,000 miles, completely stock. I've read through this thread, just praying I can find an answer. |
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06-19-2018, 06:26 PM | #319 |
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Did you swap injector 3 into another cylinder to rule it out. I have an 08 and mine went right around the same milalage
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06-19-2018, 07:45 PM | #320 | |
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Are there any concerns with swapping injectors without replacing the seal? Obviously I'd try to do it quickly. |
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06-28-2018, 06:03 PM | #321 |
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Misfire Cylinder 3
Had a "Misfire Cylinder 3" code. Rough idle, rough acceleration.
- new plugs - new coils - cleaned intakes - replaced VCG (not intended to fix the misfire but it needed to be done) - new injectors Put it back together and "Misfire Cylinder 3". What's next? Bank 1 pre-cat O2 sensor? I just ordered one. No idea what else it could be. Wiring harness? |
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07-17-2018, 09:06 AM | #322 |
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I haven't been online for a while. So you think it may be timing related? Maybe I should run some logs and see if anything interesting shows up under light load when the car seems to be misfiring. It looks like the MHD requires an android device.
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2008 335xi - JB5 ISO e50, VFSR catless DP, DCI, VFSR FMIC. Fuel it stage 1, VMR V710s. 407/446 rwhp/rwtq.
2004 Cobra - Basic bolt ons with a tune. 450rwhp/rwtq450. Port coming soon. 2013 X5 50i - muffler delete, xHP tune, ESS tune on the way. 2016 Mustang GT Roush Phase 2 with VMP 767 HP kit. |
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07-17-2018, 09:25 AM | #323 | |
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MHD costs: - Cheap Android Tablet - $70 (I got a refurbed Galaxy Tab from Walmart) - DCAN cable: $25 - MHD BEF flasher: $79 - Total: $174
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2011 E92 335is, Space Grey/Coral Red, 6MT.
RB 2+, Wedge tuned. E85 PI coming soon. |
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08-26-2018, 10:30 PM | #324 | |
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What about a poor connected vent hose? Top left on no # 9. The square clips don't seem to hold the vent hose securely in place, and there is always a 1 -3 millimeters gap. I found my clips partially broken too.... Managed to secure it better with zip ties at the moment. |
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09-19-2018, 11:02 AM | #325 |
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help please negative timing during wot
so every time I go wot it either drops -3 on one cylinder, some or all please help! e92 FBO 66k miles! just got done putting it together, it's on mhd v7 stage 2 and v8 stage 2 on data logs. I know its the DME helping knock but whats causing it? when DME corrects its usually IAT, plugs, coils, too aggressive map or trash fuel. I know its not too aggressive map because come on its mhd not no custom map and it has brand new coils and plugs with less than 250miles on them and its not the fuel. i know my IAT's were hot but were the hot enough to pull timing and don't worry 7.5 inch will be here Friday!
LOGS: https://datazap.me/u/mason54/log-153...og=0&data=3-24 mods: 4 bar map sensor IGNITION COILS (6 OF THEM) ES: 2919787 HIGH FLOW FUEL PUMP - 255LPH ES#: 2189784 2011 M3 LSD DIFFERENTIAL (3.15 RATIO) 2011 M3 HALF SHAFTS (LEFT AND RIGHT) 2011 M3 DRIVESHAFT MOTIV TWIN DISC CLUTCH ET - BMW N54 1300 TQ CAPACITY MOTIV THROW OUT BEARING MOTIV PILOT BEARING ECS PERFORMANCE CLUTCH FORK PIVOT PIN ES#: 2992391 CLUTCH FORK LEVER ES#: 41235 DUAL COLD AIR INTAKE BMW FUEL INJECTORS (SET OF 6 FOR N54-INDEX12) - GENUINE BMW #: 13538648937KT NGK 93026 DILKAR8A8 LASER IRIDIUM PLUGS 6 OF THEM #: NGK93026 GAP at .022 HP AUTOSPORT MODIFIED CLUTCH DELAY VALVE ULTIMATE SHORT SHIFTIER EVO3 WHOLE SHIFTIER KIT #: USSE335+86-3 VRSF CHARGEPIPE UPGRADE KIT BLOW OFF VALVE TURBOSMART KOMPACT PLUMB BLACK DIVERTER VALVE VRSF 3" CAST STAINLESS STEEL CATLESS DOWNPIPES V2 N54 CERAKOTE HIGH TEMP COATING TUNER MOTORSPORT SOLID ALUMINUM ENGINE AND TRANSMISSION MOUNT SET T#: 397211 REAR DIFFERENTIAL MOUNTS - SOLID DELRIN RACE T#: 1453 |
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01-24-2019, 03:21 PM | #327 |
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Posting just to relay my misfire story (knock on wood):
Bought the car in August from my mom who has owned it since new, 63k miles on a 2008 335i. Car had a pretty serious misfire when getting in the higher RPMs and especially in boost. She didn't really notice/care, but had all the maintenance records. The plugs and coils were only 10k miles old, a couple injectors had been replaced, but not since like 2013. I did a couple full throttle pulls and got the car to throw a code, cyl 3 misfire. 1) Replaced the plugs and the cyl 3 coil. Car wouldn't even idle properly. Threw the stock coil back in and it ran fine. So it was either bad out of the box or I didn't seat it properly. So basically all the plugs were new Bosch replacements and the car ran much better. Still misfiring ever so slightly, but much better than before. 2) Replaced all the vacuum lines, no change. 3) Finally got the intake valves walnut blasted, this completely cured the misfire. The car runs perfectly smooth at full throttle all the way to redline. The pic of the intake didn't look too bad, but lots of gunk around the valves themselves. I was surprised that could make such a difference. Now the car is getting driven daily on my 50 mile/day commute, so it'll get 15-20k a year on it instead of 5-6k. My mom did a ton of very short trips, so I'm betting putting more sustained highway miles on it will be better for the car in the long run. |
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02-04-2019, 11:12 AM | #328 | |
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exhaust vanos replaced new oem plugs new oem coils walnut blasting compression check swapped injectors with old injectors I had from other cars. made no difference swapping out 2 at a time. Next intake vanos replacement Remove JB4 tune? Replace precat 02 sensors? Swap more injectors around or just buy a set?
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2008 335xi - JB5 ISO e50, VFSR catless DP, DCI, VFSR FMIC. Fuel it stage 1, VMR V710s. 407/446 rwhp/rwtq.
2004 Cobra - Basic bolt ons with a tune. 450rwhp/rwtq450. Port coming soon. 2013 X5 50i - muffler delete, xHP tune, ESS tune on the way. 2016 Mustang GT Roush Phase 2 with VMP 767 HP kit. |
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03-14-2019, 12:43 PM | #329 | |
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2008 335xi - JB5 ISO e50, VFSR catless DP, DCI, VFSR FMIC. Fuel it stage 1, VMR V710s. 407/446 rwhp/rwtq.
2004 Cobra - Basic bolt ons with a tune. 450rwhp/rwtq450. Port coming soon. 2013 X5 50i - muffler delete, xHP tune, ESS tune on the way. 2016 Mustang GT Roush Phase 2 with VMP 767 HP kit. |
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03-14-2019, 08:14 PM | #330 | |
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Removed the JB4. That didnt help. I guess Ill do O2 sensors next. |
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