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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Need Help ASAP with crank but no start



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      07-13-2018, 01:19 AM   #1
codycato1882
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Need Help ASAP with crank but no start



2007 E93 n54 MSD80

So my wire harness that goes to the coils had a exposed wire ( didn't notice it)until it sparked while removing engine cover. Light in the car dimmed and came back on. Car wouldn't start just cranks, I scanned with MHD and had no error codes.

Someone suggested changing coils and plugs but no luck. another said dme relay I swapped tit with the fan relay no luck, but I wasn't 100% sure if that was the DME relay in the fuse box. Don't have a blue relay in ecu box.

I even checked mosfets and continuity was good. The coil wires are also good I checked continuity on all of them After I reinstalled the DME I got the following codes

29E2 -DME- Fuel injector rail, pressure-sensor signal
29F3 - Fuel low pressure sensor, electric
2ACB -DME master relay, activation
2ACC Master relay, shift delay
2CF9 Throttle valve potentiometer 1
2CFA " " " 2
2D09 THROTTLE

BEFORE I START REPLACING RANDOM PARTS CAN ANYONE HELP ME PINPOINT THE REAL PROBLEM?
if the dme is bad what's my best option in terms of upgrading to MSD81?
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      07-14-2018, 05:50 AM   #2
JuniorB
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Coil power comes from the ECU. If no power is present, look for blown ECU fuses . As long as there are no cam, crank sensor codes, it should start if ECU power is present.
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      07-14-2018, 07:18 AM   #3
codycato1882
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Quote:
Originally Posted by JuniorB View Post
Coil power comes from the ECU. If no power is present, look for blown ECU fuses . As long as there are no cam, crank sensor codes, it should start if ECU power is present.
thanks i found the fuse. car running now
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      08-18-2019, 09:51 PM   #4
Parkede93
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Quote:
Originally Posted by codycato1882 View Post
Quote:
Originally Posted by JuniorB View Post
Coil power comes from the ECU. If no power is present, look for blown ECU fuses . As long as there are no cam, crank sensor codes, it should start if ECU power is present.
thanks i found the fuse. car running now
What fuse was that? having the same problem with sane codes thank you
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crank no start, dme, e93 335i, n54 335i, no start, relay

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