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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Jul-15-2018, 01:09:42 PM   #11
bigjae1976
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Default Re: Lost power while driving, not the typical problem

I’d start with your fuel pump if it isn’t turning on.


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Old Sun, Jul-15-2018, 02:29:06 PM   #12
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Default Re: Lost power while driving, not the typical problem

There is a black fuel pump relay in the rear of the car just above passenger rear strut mount. It is easy to blow - example if you forget to connect ground for coils it will back feed and blow the relay. I’d start by replacing that.


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Old Sun, Jul-15-2018, 04:35:00 PM   #13
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Default Re: Lost power while driving, not the typical problem

Quote:
Originally Posted by terraphantm View Post
Negative cable touching body wouldn’t have done anything, but negative cable coming off the battery could have. Look up load dump
This! Terra to the rescue

Sounds like a transient smoked something important
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Old Mon, Jul-16-2018, 02:34:08 AM   #14
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Default Re: Lost power while driving, not the typical problem

ok ill order a new EPK relay, i would love to test it but its not a normal relay in the sense that it has 8 prongs instead of 5..

i tried to get into the DME with INPA and its not finding it either..
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Old Mon, Jul-16-2018, 07:30:25 AM   #15
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Default Re: Lost power while driving, not the typical problem

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ok ill order a new EPK relay, i would love to test it but its not a normal relay in the sense that it has 8 prongs instead of 5..

i tried to get into the DME with INPA and its not finding it either..


The way I “tested” mine was to pull it and just put a jumper in the socket. Once I did that I could hear fuel pump prime and car started.


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Old Tue, Jul-17-2018, 06:31:15 PM   #16
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Default Re: Lost power while driving, not the typical problem

Which terminals did you jump
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Old Wed, Jul-18-2018, 01:02:08 AM   #17
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Default Re: Lost power while driving, not the typical problem

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Originally Posted by T3AMFiSh View Post
Which terminals did you jump

6 or 8 to 2



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FLMS Half Cage, RaceTech 4009HR drivers seat, Schroth 6-Pt Harness, E.S.S. Fire System, AIM SOLO DL with ECU Harness, SmartyCam, Angle Aluminum with VAC dead pedal, Sparco Steering Wheel on MOMO hub, MCS Suspension, Hyperco 800F 900R springs, Hotchkis Front and Rear Sway bars, Vorshlag Camber Plates, Turner ARCA, AJ Hartman Front Splitter, BW V2 Wing, BW CF Rear Diffuser, APEX ARC-8 wheels, Brembo BBK Front, Carbon Fiber Roof, CF Headlight Blanks, Door Windows and Cards Delete, TMS rear and front subframe reinforcement, Zionsville Competition Cooler, BW Oil Cooler, Oil Diverter Valve, Motorsports Thermostat, Evolve CF Intake, Epic Stepped Headers, Turner Pulleys, BW 3.5" Race Exhaust, EPIC Alpha N Tune, Beisan Oil Disk and Vanos Seals, ZF 5MT, CAE Ultra Shifter

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Old Wed, Jul-25-2018, 11:56:12 AM   #18
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Default Re: Lost power while driving, not the typical problem

Any updates?


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My track journal: http://www.m3forum.net/m3forum/showthread.php?t=509148
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Old Tue, Jul-31-2018, 07:08:55 PM   #19
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Default Re: Lost power while driving, not the typical problem

Yeah the NEW EKP RELAY did not fix it, going to pull the fuel pump today and see if any wires are burned
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Old Tue, Jul-31-2018, 07:13:41 PM   #20
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Default Re: Lost power while driving, not the typical problem

Quote:
Originally Posted by T3AMFiSh View Post
Yeah the NEW EKP RELAY did not fix it, going to pull the fuel pump today and see if any wires are burned
It's probably your DME
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Discussing Lost power while driving, not the typical problem in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)