Its Official, im screwed

ZoomVT

Glorified Newbie
Contributor
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2008 | BMW e90 |
Alright, so i think that my cars electric system has officially died on me.
It is be having really strange and im not sure what to do now.
I have 36k miles on the car, so i am stil under warranty. However i have mods so i would have to revert back to stock if i wanted to bring it to the stealership.
I also have questions about what could have caused the PJB to goe ape s*** on me. I have not made any recent mods involving the electrical system. The mod that seems to have kickstarted it all was the CAI. All i can think of is the MAF sensor having something to do with it, but thats it.
Some of the syntoms the car is showing are the radio turning off and on randomly, sometimes consecutively where you cant even listen to the radio. ( a few times this happened)
My power steering would shut off and then it would back on after i hit the brakes (Once).
When i use my turn signals, my lights wqould flicker, the dash would flicker, and the radio would turn itself off and on again. (2 or 3 times)
When i hit the brakes, the dash would flicker and the radio would turn off and on, also it would bring my power steering back. (2 or 3 times)
Most of these symtoms happened in a 3 hour trip from Boston to Burlington. I dont think the speed has anything to do with it, but yes i was driving fast and consistently for 3 hours. And towards the end of the trip i experienced most of these issues.

The major issue i have with it is that the car would be fine, and when i have tries to start it a couple of times, it has died on me.
I open the door and the dash lights up normally, the dome lights go on. The kley symbol on the dash lights up and flashes normally. I insert the key and try to turn, and the car has no power at all. There isnt even a click. All the lights are dead and there is no sign of life in that car.
This has happened twice. The first time i didnt do anything, i opened the hood and checked my wire connections, i wasnt sure what i was checking for so i just looked around. Took the battery cover off and looked around a little more. Nothing, i figured i would try it again anyways, and it started like nothing happened.


Now, the second time happened after the issues above happened, i made it home ok, but the next morning the car died just like i described above. Except this time the car wouldnt just start after. I actually disconnected the battery and connected it again, and then the car started no problem.

Now, i would like to hear all kinds of ideas, suggestions, etc from you guys. I am pretty sure the PJB is cooked, but im hoping it is something easier or something that can be fixed easier. Maybe the alternator is toast, or maybe a flash of the ECU will fix it.

Any ideas?

The only electric mods i have is the aftermarket HIDs that were installed almost a year ago without a problem, and an amp and sub box installed over a year ago. I feel like its too long ago for either to affect the PJB.

Right now im waiting for the 2007 update to be released so i would trade for that one. so if there is any way to fix this temporarily it would be great.
 
damn bro knew you were having problems but holy crap!!
check your ground on your battery from the neg post to the chasis make sure its tight some of the symptoms sound like what happened to me when i put my own ground off of the neg terminal and didn't get good contact with the frame. i ended up cutting the little grounding lug off of the factory one and attaching my 0 awg wire to it and then to the frame....

your speakers aren't amp'd just a sub correct?
it may be worth a shot just to put your stock air box back on and see what happens as well. (you don't have to put on the resonator part just the airbox) and see what happens then?
 
I read a TSB about the fusebox and the connections coming loose. Check the TSB links post and maybe it relates to your situation....:cool:


Zc
 
I know this sounds dumb, or simple. But, check your battery cables and battery terminals. One of my cables had terrible corrosion underneath the rubber boot that I didn't spot at first. I would have dome lights, and dash lights, but the second I went to turn on the car everything would go blank and the car wouldn't start. With the bad cable I was trying to draw too much power through a bad connection and it was shorting.

However I'm not sure this affects anything once a car is running, as the car draws it's power from the alternator as well, and might not be affected by a bad battery cable.

EDIT: I might add that these bad cable problems were not with my Mazda 3, but my other car. However I think the mazda would react the same to this situation.
 
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Thanks for the ideas/opinions guys. Very much appreciated.
Interesting all of you think it may have something to do with the battery, it is very possible and i will check that. I wouldnt be surprised, although i havent touched the battery in over a year. Well until recently that i had to disconnect/connect back again.
You all mention the ground wire, i am going to try to look at that and see. Also, i am going to wait until it starts acting out again, it drives normal again for now; i want to see if i can identify a pattern, whether is distance or time or weather or something.

Keep the ideas coming though.
 
What have you done yourself to diagnose the problems?

I would revert back to stock for a little while if you believe your dealer may have a problem with the CAI (totaly unrelated btw).
And I would take advantage of the 4,000 miles left on your warranty, and have the dealer mess around with the electronics.
You will get a loaner for free with warranty work, and worst case, theyll only fix it half-way, but its better than nothing.
Use that warranty!
Electrical stuff is no joke to hunt down, I had ghosts in my old Protege that took 2 years to track down (was a phantom draw that killed batteries after just a few months, with related sympton).
I went through 2 rebuilt alternators, and like 4 batteries, but it was a grounding loop or something that drew like 1 volt constantly, ruining the batteries over time. And when the batteries got really low, I had intermittent startup, weird computer issues, poor electrical performance (dimming, radio shutting off, etc..)
 
i know what you are saying.
I know the CAI is unrelated and it would be fairly easy to revert back. I would have to remove my HID conversion which is not very difficult either, but that could have some effect on this issue.
Now if i had a good dealer around me i wouldnt hesitate to do this, but i wouldnt be getting a loaner here and i would have to rent a car at my own cost. Yeah i know its part of the warranty, but my dealer has a longer wait period for people expecting a loaner. And they dont do rentals.
So far i have not had any other problems yet, but it has only been 4 days. If i have time this weekend, i will remove my mods and bring it in, although i am sure they know about my mods.
Anywyas, thanks for the advice.

Any more suggestions?
 
Checking grounds is a good idea. Especially with the "turn the key and everything dies" symptom. Be sure to check BOTH ends of the ground cable.

Yours sounds different than when my PJB fried out but that doesn't really mean a lot where computer-controlled circuits are concerned.

Where did you tap into power for your subs?

If the HIDs draw more power than the regular headlights, that could mess with something and it could definitely take a while for it to finally die.
 
UPDATE:
Alright, so since this incident, i have not experienced any symptoms. I actually had forgotten about this issue.
Since my first post, i only had another CEL (it has been raining like crazy) but no electrical problems at all.
Thank you everyone for their help and suggestions. I guess i will just notch this up as a strange issue and i hope it doesnt come to hunt me in the future.
 
i'd still check all connections at the battery, at least...sounds like a bad ground/connection, somewhere?
 

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