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E90 335i (N54) Won't Start When Warm
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09-04-2018, 04:26 PM | #1 |
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E90 335i (N54) Won't Start When Warm
So the car starts just fine when cold and when left alone for over an hour. However, it won't start, for example, if I drive to a store and stay for a bit then drive to another store and stay for about half an hour. No crank but all lights and electronics work. I have to leave it there for over an hour for it to barely crank. Can't really figure out why. Also, sometimes on cold start all the ABS and transmission lights will come on. I turn it off then on and they go away and the car runs just fine. Very odd to me. My guess (and hope) is that I just need a new battery but I've heard it could be IBS or my starter. Thanks for looking.
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09-05-2018, 05:49 PM | #3 |
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Crankshaft position sensor right? I haven't yet but I guess that could be it too. Damn so many possibilities lol gets me to work, school and home just fine just sucks having to plan out trips where I need to stay more than an hour or else I'm stranded.
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09-06-2018, 10:26 AM | #4 | |
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correct. European Crank sensors like to fail...i dunno why. On my mercedes anything valeo or bosch broke. All the parts that were reliable on my mercedes at the time was american or japanese lol. Anyways, its relatively cheap part so might be worth it to give it a shot. But fastest way is just pull the code. The e92/e90 canbus system is pretty good at telling you what exactly is failing or not working, everything else is just a guess. |
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09-06-2018, 01:09 PM | #5 | |
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Just me thinking out loudly and I could be wrong. You stated that when your car is cold or left alone, car starts fine. But if you drive (short distance) for instance-store to store, your car has a hard time starting or cranking? you also mentioned that most times, if you let it sit, it starts. I would check my battery. also, when youre having a hard time starting the car, I would check the batteries CCA(cold cranking amps output). Could be that battery is not putting out the full cca=cold cranking amps to start car. Would this make sense, after making all those short trips the cars alternator cant charge the battery to put out enough cranking amps because its to weak??? Im curious to know what was the problem on this. keep us posted. |
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09-06-2018, 04:26 PM | #6 | |
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09-06-2018, 04:44 PM | #7 | |
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so with that test, what are you going to do? Are you planning on changing out the battery? If so, try to match what you have in your car so all you have to do is register it to your DME (computer) so it resets and record the date of change. If changing to a different size battery i.e. 790cc to 850cc and ah(amp hour) differ, you will need to configure these changes. also, just a side note, if you battery WAS good, my next step would be to check your starter. But since your battery is showing bad, I'd highly recommend you changing it. Hope this helps |
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09-07-2018, 10:32 AM | #8 |
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09-07-2018, 04:35 PM | #9 | |
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09-17-2018, 07:47 PM | #10 |
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Update! Finally changed my battery today and...car starts up every time Going to get it registered later this week but it seems like she's all good. Even start ups feel a bit different. Thanks for all your help and I hope someone finds this helpful. Now off to find my coolant leak
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09-17-2018, 08:08 PM | #11 |
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Glad you got it fixed! And as you found out, these newer BMW's do some very weird and sporadic things when the battery starts failing. Get it registered ASAP, as I had some weird errors codes pop up after a week or so of not having the new battery registered and coded.
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09-17-2018, 08:38 PM | #12 | ||||
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But yea, these cars with all the computers do act really interesting when battery voltage is low. Glad to hear you got it fixed for cheap |
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