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BMW 3-Series (E90 E92) Forum
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car bucking violently, cutting off
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04-25-2018, 11:54 AM | #177 | ||
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04-25-2018, 12:38 PM | #178 |
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BMW has a way to test the DME.. you have to specifically request it before you go in .. there was a guy in the forum who had BMW diagnose a DME and they fixed his issue. If you want I can give you contact details to a guy who does DME for n54 for a living perhaps you can call him and explain your situation and see what happens. Don't know if that will make a difference since you already ordered a new one. So if that doesn't work .. do continuity tests, check all the wiring leading up to dme.
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04-25-2018, 05:47 PM | #180 |
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05-06-2018, 12:16 PM | #182 |
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It didn't. Same thing... After it warmed up ok (was low 80's the other day when I tested it) I gave it some stick, and it started shaking and backfiring so bad, it sounded like a shotgun, engine stalled. Got a bit scared, and went very slow home, limping.
I am afraid the backfires blew out my newly installed cats, too. I now know why they were destroyed. I dropped it to another guy which was recommended to me, he is the only BMW trained specialist apparently in our area. I am away for work for a while, so I left it for somebody else to look at it... On my drive to that shop, it went ok with no events, as long as I kept revs at or below 2000 rpms. As soon as you put some load, it goes crazy, turbo or no turbo (did the vacuum lines test from solenoids, same thing). I don't have high hopes though... I am still puzzled on what it could be. Still no error codes, even with the new computer. I give this guy a chance, then off she goes to parts... I don't have space for another car, and I need to buy a car for winter before it hits. |
05-06-2018, 01:42 PM | #183 | |
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05-07-2018, 12:29 AM | #184 | |
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05-07-2018, 11:14 PM | #186 |
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05-18-2018, 03:00 PM | #187 |
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Just got the call from Revolution Automotive in Norwood; this is where my friend told me to take it. They do have more tools than the generic BMW shop, and is the only shop in MA where technicians are trained by BMW apparently (no the dealer's are not).
They found a few things wrong; firstly the voltage drop was determined to be due to the alternator dropping out/shorting when hot... I have a receipt of an alternator being changed last year, but obviously it hasn't been. The second thing; and the smoking gun was apparently the crank angle sensor again? The sensor was aftermarket, and was installed with wrong hardware (bolt was loose) and was randomly dropping signal causing the rpm needle drop... I am still pessimistic on this being the actual fix; I would expect a DME error when crank angle sensor is dropping like that ? Anyway, over 2g later it is what it will cost me now (battery was also found bad; although I don't really believe or swallow this, it was holding on pretty good on negative temperatures this winter). I can take this hit if it actually fixed the car for now. I will report later. UPDATE: 50 miles later, and all kind of driving conditions, car is perfect. So, to recap; intermittent drop of voltage from faulty alternator, and non -genuine crank angle sensor. And stupid me I had it out in my hand, looked at it and I swear it looked original. It had "Continental" stamped on it, and speaking to BMW shop, they said Continental makes them for BMW. The one in the car now, was 2xx bucks, has BMW stamped on it and is from.... BMW ![]() So never ever put anything but OEM in these cars, it cost me 4 months of troubleshooting just because an idiot installed a non-genuine item. And I never thought to go back at it and change it again. Last edited by torrque; 05-19-2018 at 04:03 PM.. |
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05-23-2018, 10:06 AM | #188 |
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Congratulations!!! Finally! Similarly something happened to my car when I installed an after market o2 sensor. Misfires and weird codes.. changed to OEM and all was good..
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05-23-2018, 01:32 PM | #189 | |
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05-23-2018, 02:48 PM | #190 |
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Thanks all, indeed a relief. I already used a couple of 18 y.o. single malt bottles celebrating with friends
![]() I bought this car with confidence I can fix it myself... I troubleshot about two weeks, then it spent 2 weeks with BMW of Boston, 3 weeks with German Performance, and it had another month or so in the shop the previous owner took it ...Nobody but Alan from Revolution Automotive could fix it. I've been waiting for this for months... Got eibach springs for it waiting in my shed, new carbon brakes, rear trunk wing M3 a-like front spoiler valance, black paint for wheels, etc etc. I am now in talks with MHD to move my license to the current DME... Will post some pics when ready. |
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