Help! 335i not starting after DME work

carl425 · 10-23-2014, 07:22 PM

Hi, first post here on this awesome resource and I'm looking for some help...

So, I suffered the failed MOSFET syndrome that it seems is quite common to E90/92/93 with a MSD80, so I ordered 6 of them and replaced them all--well actually a local TV repair place did it for $50 (winning!).

Brought the boards home, reinstalled in the DME case and put everything back together. Tried to start it and though it cranks, it doesn't fire at all. I've checked EVERY connection (there aren't that many) and every logical fuse.

The P30BA that started it all is gone but now I get the following:
ECU
P2ACC, DME main relay, switch delay
P29F3
P29DB

I've checked the DME relay, if it's the one in the DME tray/compartment and the fuel pump fuse, and both are good. What else could be causing it to not get fuel (my assumed problem at this time)?

Any help with this is greatly appreciated!

cleex024 · 10-23-2014, 10:29 PM

Did you test the mosfets? Sometimes it's hard to tell but maybe the connections aren't good

carl425 · 10-23-2014, 10:32 PM

I tested them individually on the board to see if they were good after the install and they all checked solid.

Jeff@TopGearSolutions · 10-24-2014, 12:14 PM

Just thinking out loud but did you check the fuses? I saw you mention you checked a couple but perhaps check them all.

carl425 · 10-25-2014, 05:38 PM

Yep, checked them all today. None of them bad.

Called the stealership and they said there's no way to diagnose the DME out of the vehicle to determine if it's still good. Methinks the TV repair place may have damaged the DME while replacing the MOSFETs.

Relented and had it towed to the dealer today--can't wait to see this bill...

335NJ · 10-25-2014, 06:02 PM

Quote:

Originally Posted by carl425

Yep, checked them all today. None of them bad.

Called the stealership and they said there's no way to diagnose the DME out of the vehicle to determine if it's still good. Methinks the TV repair place may have damaged the DME while replacing the MOSFETs.

Relented and had it towed to the dealer today--can't wait to see this bill...

Keep us updated with what they say, good luck man

FrankyGTR · 10-27-2014, 04:19 PM

i got a simillar issue my car wont start after uninstalling procede ecu tune.its at the shop now

carl425 · 10-30-2014, 10:03 PM

DME is bad. The work didn't look stellar when I got it back from the TV shop but what can you expect for $50.

No expectation of the DME to be warrantied since its been opened/tampered with either.

Can't believe I'm saying this but I should've taken it to the stealership to begin with.

FrankyGTR · 10-31-2014, 05:03 PM

dme is bad on mine too bud.i dont even have enough monies right now to fix my car.

let us know how much the dealer charges you in total,the shop told me 16-1700$

carl425 · 11-02-2014, 07:21 AM

Well, picked her up yesterday and the total damage was $2700. New DME, low pressure fuel sensor and a coil on #1. I don't think that's reasonable but I did think it would be about $3K.

Contemplating putting the Cobb tune back on as the new DME warranty is only two years and I seriously doubt it had anything to do with the initial misfire and DME failure to begin with. Thoughts?

cleex024 · 11-02-2014, 07:58 AM

Quote:

Originally Posted by carl425

Well, picked her up yesterday and the total damage was $2700. New DME, low pressure fuel sensor and a coil on #1. I don't think that's reasonable but I did think it would be about $3K.

Contemplating putting the Cobb tune back on as the new DME warranty is only two years and I seriously doubt it had anything to do with the initial misfire and DME failure to begin with. Thoughts?

have you tested the dme? $3k is a lot of money to most people, but is it worth it to you? If you think $3k is worth your time then its a good deal, especially if you dont like tinkering with your car's electronics. Plus im sure the dme they are replacing it with is the upgraded dme so you probably wouldnt have to deal with the dme going bad anymore.

carl425 · 11-02-2014, 12:38 PM

Though I'm electronically savvy enough to test it if I had clear direction, I did not, so I couldn't. Stealership claimed they didn't have the capability to test it, just say if it was bad or not.

And $3K is a bundle for me so, no, is wasn't worth it but yes, I did need the car back on the road.

As for whether I got the MSD81, I forgot to ask. Looking at the paperwork now to see if it says or not...I hope so from what I've read.

10-23-2014, 07:22 PM	#1
carl425 New Member 0 Rep 7 Posts Drives: 2008 335i Join Date: Oct 2014 Location: AL iTrader: (0)	Help! 335i not starting after DME work Hi, first post here on this awesome resource and I'm looking for some help... So, I suffered the failed MOSFET syndrome that it seems is quite common to E90/92/93 with a MSD80, so I ordered 6 of them and replaced them all--well actually a local TV repair place did it for $50 (winning!). Brought the boards home, reinstalled in the DME case and put everything back together. Tried to start it and though it cranks, it doesn't fire at all. I've checked EVERY connection (there aren't that many) and every logical fuse. The P30BA that started it all is gone but now I get the following: ECU P2ACC, DME main relay, switch delay P29F3 P29DB I've checked the DME relay, if it's the one in the DME tray/compartment and the fuel pump fuse, and both are good. What else could be causing it to not get fuel (my assumed problem at this time)? Any help with this is greatly appreciated!
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10-23-2014, 10:29 PM	#2
cleex024 Lieutenant Colonel 104 Rep 1,529 Posts Drives: 2008 BMW 335i Coupe Join Date: Mar 2011 Location: Woodbridge iTrader: (2)	Did you test the mosfets? Sometimes it's hard to tell but maybe the connections aren't good
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10-23-2014, 10:32 PM	#3
carl425 New Member 0 Rep 7 Posts Drives: 2008 335i Join Date: Oct 2014 Location: AL iTrader: (0)	I tested them individually on the board to see if they were good after the install and they all checked solid.
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10-24-2014, 12:14 PM	#4
Jeff@TopGearSolutions 3441 Rep 79,211 Posts Drives: C6 Z06, 09 335i, 10 335xi Join Date: Dec 2008 Location: www.TopGearSolutions.com iTrader: (37)	Just thinking out loud but did you check the fuses? I saw you mention you checked a couple but perhaps check them all.
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10-25-2014, 05:38 PM	#5
carl425 New Member 0 Rep 7 Posts Drives: 2008 335i Join Date: Oct 2014 Location: AL iTrader: (0)	Yep, checked them all today. None of them bad. Called the stealership and they said there's no way to diagnose the DME out of the vehicle to determine if it's still good. Methinks the TV repair place may have damaged the DME while replacing the MOSFETs. Relented and had it towed to the dealer today--can't wait to see this bill...
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10-27-2014, 04:19 PM	#7
FrankyGTR Second Lieutenant 18 Rep 195 Posts Drives: N54 335i 6MT-R32GTR Join Date: May 2013 Location: Montreal iTrader: (0)	i got a simillar issue my car wont start after uninstalling procede ecu tune.its at the shop now __________________ 2008 335i coupe 6MT BOOST FIEND
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10-30-2014, 10:03 PM	#8
carl425 New Member 0 Rep 7 Posts Drives: 2008 335i Join Date: Oct 2014 Location: AL iTrader: (0)	Result... DME is bad. The work didn't look stellar when I got it back from the TV shop but what can you expect for $50. No expectation of the DME to be warrantied since its been opened/tampered with either. Can't believe I'm saying this but I should've taken it to the stealership to begin with.
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10-31-2014, 05:03 PM	#9
FrankyGTR Second Lieutenant 18 Rep 195 Posts Drives: N54 335i 6MT-R32GTR Join Date: May 2013 Location: Montreal iTrader: (0)	dme is bad on mine too bud.i dont even have enough monies right now to fix my car. let us know how much the dealer charges you in total,the shop told me 16-1700$ __________________ 2008 335i coupe 6MT BOOST FIEND
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11-02-2014, 07:21 AM	#10
carl425 New Member 0 Rep 7 Posts Drives: 2008 335i Join Date: Oct 2014 Location: AL iTrader: (0)	Well, picked her up yesterday and the total damage was $2700. New DME, low pressure fuel sensor and a coil on #1. I don't think that's reasonable but I did think it would be about $3K. Contemplating putting the Cobb tune back on as the new DME warranty is only two years and I seriously doubt it had anything to do with the initial misfire and DME failure to begin with. Thoughts?
	Appreciate 0 Quote

11-02-2014, 12:38 PM	#12
carl425 New Member 0 Rep 7 Posts Drives: 2008 335i Join Date: Oct 2014 Location: AL iTrader: (0)	Though I'm electronically savvy enough to test it if I had clear direction, I did not, so I couldn't. Stealership claimed they didn't have the capability to test it, just say if it was bad or not. And $3K is a bundle for me so, no, is wasn't worth it but yes, I did need the car back on the road. As for whether I got the MSD81, I forgot to ask. Looking at the paperwork now to see if it says or not...I hope so from what I've read.
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