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05-25-2020, 07:10 PM | #1 |
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Help! Engine misfiring - half check engine light
Hey everyone,
My car (2008 135i, 68,319 miles) has been on MHD stage 1+ for about a month now and has been running fine without any issues. Today, I picked up the car from the shop where they installed some solid rear subframe and diff bushings. I decided I was going to change my map settings back to stock coolant target (so the oil temp would get high enough to open up the thermostat after I installed the ER dual oil cooler kit). Went for a drive and it was fine, until about 30 minutes in, the car started to misfire pretty bad. Managed to limp it home. Since I never changed the plugs out when I initially did the flash (no running issues), I threw 6 new OEM Bosch plugs. Still misfiring and MHD was saying 1,3,6 cylinders were missing. Found that odd so I reversed the order of the coilpacks and now it’s reading 1.2.3.4.5.6 were all misfiring. Changed the coils back to the original order and it still saying 1-6 cyl misfiring. I’ve also tried updating to MHD’s newest app version and tried flashing to stage 0(stock map) and it still misfires. Flashed back to the original v9 I had installed and same thing. Before I go spend money on 6 new coil packs... anyone have any other suggestions? Or is it just time and all 6 coil packs went haywire at the same time? From what I could tell the spark plugs were original on the car (they say BMW BOSCH on them). Any insight would be greatly appreciated! -Eric Last edited by yokomo963; 05-25-2020 at 07:20 PM.. |
05-25-2020, 09:18 PM | #2 |
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Drives: 2008 135i E88
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Best thing to do is check your plug gap 1st. then get new coils since they are not that expensive if you get some delphi from someplace like rock auto. Especially if your still on stock.
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05-26-2020, 08:24 AM | #3 | |
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I ordered 6 new Delphi coils from FCP euro last night so hopefully that's the culprit. The original spark plugs didn't look terrible when I pulled them either. I just find it odd that so many of the cylinders are missing all of a sudden. would all the coils start to go at once? The only other thing that happened yesterday is that I filled the gas tank up at a different gas station than I normally go to. -Eric |
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05-26-2020, 09:40 AM | #4 |
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So, update from this morning. I went outside after leaving the car all night, cleared the codes on the DME and started up the car. It fired right up without misfiring... and after a minute, the car started to misfire again. DME is showing Cyl 2,3,5,6 are all misfiring.
Granted I already ordered new Delphi coils from FCP last night. But since it was fine on a cold start, I'm leaning towards coil packs (i'm worried its injectors or HPFP, all plugs were dry tho when I pulled them originally). Most coil packs I've had go bad on motorcycles, they start acting up once the coils build heat inside and would be fine once the motor cooled back off completely. I guess I'm just wondering for sure for troubleshooting sake in the future. I'm pretty new to the N54 platform |
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05-26-2020, 12:02 PM | #5 |
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I just went and tried to get some logs and checked the codes again. The car still runs like crap but now the misfire codes are gone
Using MHD to pull the DME codes. Could these codes be acting up because the misfire is shaking up the car? Or actually one of these might be the culprit? |
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05-26-2020, 04:45 PM | #6 |
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Hi Eric,
First post, long time lurker... I also read the OEM plugs should be good for pump gas, even MHD stage 2+. I put in Bosch plugs and Delphi coils as soon as I got my E88, and I've been running stage 1 and 1+ for over a year now. I plan to go stage 2 with the OEM stuff. Sorry I can't help you with the codes. Hope those coils will solve your problems! |
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05-26-2020, 06:17 PM | #7 |
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You should take out your vanos and clean them. For me when I did that I temporarily stopped the camshaft timing code. Then it came back and I bought new. Never returned. How is your fuel psi on your logs?
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05-27-2020, 08:30 PM | #8 | |
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I have not tried flashing to MHD stage 1+ again though. I did do a log when driving around on stock tune after it started running good again. Could someone take a look and see if there's anything out of the norm before I try flashing MHD again? First time trying *********** upload so if that's not the best method, please let me know. https://bmw.***********.com/graphs/l...-00-29-57.646/ Thanks, Eric Last edited by yokomo963; 05-27-2020 at 09:00 PM.. |
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05-28-2020, 01:14 PM | #9 | |
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05-28-2020, 01:44 PM | #10 |
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Maybe you should reset all adaptions in mhd except the battery then try to flash again. When I did that my car ran crazy for a second, then I turned it off and back on and it ran great.
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05-28-2020, 05:14 PM | #11 |
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FWIW, that is encouraging. There's still a chance of an equipment issue, i.e. a sensor somewhere acting up intermittently. But it looks like you have no major problems, save something related to tuning and codes. That's still a headache of course but at least you have a path to go down.
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05-28-2020, 06:50 PM | #12 | |||
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I appreciate everyone that chimed in!! -Eric |
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07-14-2020, 09:53 AM | #13 |
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Yes I'm getting misfires so I think I'll get NKG and Eldor (Italian) coils..
Try getting a step Colder Bosch Plug that seems to work well with boosted engines, or... If you want to take the plunge and get NKGs this tool takes the guesswork out of gapping: I've seen them on eBay for around 10 dollars...and get the feeler gauges too, somewhere around 0.22 and go less as you HP goes up... https://burgertuning.com/products/bm...g_gapping_tool 12mm is the size sp
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Last edited by Mr Gasser; 07-14-2020 at 10:12 AM.. |
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07-14-2020, 04:52 PM | #14 | ||||
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Was doing logs and then got misfires in cylinder 5. Shut the car off and turned it back on and misfire was magically gone. Eldor coils and step 2 ngk's and my car runs great. I think best bet would be to get eldors and ngk's, gap them to 0.20 and call it a day. (If you are sure coil plug/spark plugs are your problem) |
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07-15-2020, 07:44 AM | #15 |
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Thanks guys. This was solved with new oem bosch plugs, Delphi coils, and new vanos solenoids.
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07-17-2020, 10:11 AM | #16 |
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So did you put it back to MHD stage 1+?
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07-20-2020, 08:45 AM | #17 |
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Yes, I drove around stock for a tank of gas to make sure everything was back to normal. After that and not having anymore issues, I installed some Wagner Catless dp's shortly after and reflashed the car to MHD Stage 1+. One track day and one autox later, no issues still and running strong!
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07-27-2020, 01:16 PM | #18 |
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Good to hear, seems you can go to stage 2 with the DPs? YOu have an aftermarker FMIC?
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07-27-2020, 01:27 PM | #19 |
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Yea, I'm just keeping at stage 1+ to keep the least amount of stress on stock motor/turbos. I have cfs aluminum radiator, intercooler, ER dual oil coolers installed already. I'm good with the power available now, that's the only reason why I haven't done the MHD 2+ tune
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08-10-2020, 03:51 PM | #20 |
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Unfortunately I think you'll have the intake cam code come back and car will run intermittently rough until you do cam ledges. Seems to happen around 60-80k on the original ledges
Went down this exact path at about 85k miles IIRC and solenoids and ignition parts fixed it for about a month. Both ledges ended up being worn out. Other thing to check whenever you get random codes is the battery health, but I'd say it's unlikely with the set of codes you got Hope it was just a bum solenoid! Off topic: I strongly encourage you to return to a stock sized radiator. The CSF rad has been shown to overcool the coolant system which is understandably bad.
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08-28-2020, 07:38 AM | #21 | |
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Also... I've never seen that on the CSF rad... What does overcooling the cooling system do? I didn't know that was possible haha. This car is used 95% for track/autox and doesn't really see many street miles. -Eric |
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