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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 Fri, Jan-17-2020, 06:27:41 PM   #1
M spec
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Exclamation e46 m3 starts then dies (possible ews)

Hi all,

So my key has had a dead battery for about 2 months. Still started the car, just had to use the key to lock or unlock.

This morning after a drive (car is still fairly warm) it goes to turn over, and just hunts for idle. Throttle input did nothing, like the throttle was disconnected.

All TPS were replaced 1.5yr ago
fuel pump and filter replaced 6 months ago
no CEL - spark and coils have 20k on them
no signs during the drive that the engine was having issues

My assumption is that the key is fully dead? Looking for any input from others who might have had a similar issue.

After trying to start the car a few times, it wont even turn over any more. Tries to but wont fire up. Starter hasn't given me any trouble and I believe was replaced within 40k miles ago.

Thanks for the input!

Cheers
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Old Fri, Jan-17-2020, 06:51:15 PM   #2
Obioban
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Default Re: e46 m3 starts then dies (possible ews)

EWS makes it turn on for half a second then immediately die. Doesn't sound like you're having an EWS issue.

Based on the symptoms, my guess would be fuel pump... but having replaced it 6 months ago makes that seem less likely. What brand pump did you use?
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Old Fri, Jan-17-2020, 06:54:25 PM   #3
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Default Re: e46 m3 starts then dies (possible ews)

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Originally Posted by Obioban View Post
EWS makes it turn on for half a second then immediately die. Doesn't sound like you're having an EWS issue.

Based on the symptoms, my guess would be fuel pump... but having replaced it 6 months ago makes that seem less likely. What brand pump did you use?
The E85 compatible AEM.

It's odd. It will do both. Start then die immediately. Then start, hunt for 2-3 seconds and die.

About to check power to the pump. But I figured an over used 2002 key which already had a dead battery (I know the lock/unlock battery is separate from the EWS, but its a sign its old as ****) could have a now bad EWS. It just gave me no warning of issues, which I believe im usually pretty on top of how the car feels engine/chassis wise.
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Old Fri, Jan-17-2020, 06:58:51 PM   #4
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Default Re: e46 m3 starts then dies (possible ews)

My second key is dead and won't start the car (lock and unlocks though), but it's a case of nothing happening, not the starter trying but not catching. Your issue doesn't seem software or electronics related to me.
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Old Fri, Jan-17-2020, 07:03:57 PM   #5
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Default Re: e46 m3 starts then dies (possible ews)

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Originally Posted by TboneM3 View Post
My second key is dead and won't start the car (lock and unlocks though), but it's a case of nothing happening, not the starter trying but not catching. Your issue doesn't seem software or electronics related to me.
If the starter was dead, wouldn't it not start at all? And why is the throttle complete dead? When its hunting for idle, and apply throttle, it does nothing to affect the idle.

Waiting for local car friend to come crawl back there to check the pump. I cant really hear the pump after removing the seat, so POSSIBLY bad wiring from whatever company that was that made the kits?

Ah also forgot I replaced the ICV, too, maybe 2 years ago? Been through the car fairly well mechanically.
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Old Fri, Jan-17-2020, 07:05:22 PM   #6
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Default Re: e46 m3 starts then dies (possible ews)

Not the starter if it's firing and dying.

I doubt it's fuel pump wiring, if it's good enough to start up.

ECU defaults to cracking the TBs open if the ICV is no good, so I'd rule that out.

IMO fuel pump. 6 months is less suspect given that it's e85 and aftermarket...
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Old Fri, Jan-17-2020, 07:08:13 PM   #7
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Default Re: e46 m3 starts then dies (possible ews)

Ya I guess the pump not being OE makes it the most likely culprit. Can you test fuel pressure?
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Old Fri, Jan-17-2020, 07:17:34 PM   #8
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Default Re: e46 m3 starts then dies (possible ews)

Iím going to give power to the pump manually, then go check pressure.

Itíll be annoying if indeed it is a dead pump. This was the most expensive/well reviewed option they had available. Canít remember the companyís name, but I do remember their customer service was less than stellar.
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Old Fri, Jan-17-2020, 07:51:55 PM   #9
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Default e46 m3 starts then dies (possible ews)

Okay Iím at a loss.

Power from the car is a steady 12v.

The car no longer fires up.

Fuses are good.

Pump does not prime.

When I disconnect the pump and hook up a 12v source, it does indeed prime and get power.

There is no pressure through to the filter.

When I put a meter to the fuse slot, with the key in position 2, itís not registering anything.

Every fuse in the relay box is good

Update: does the relay fuse need power? Every other fuse is showing 12v but the bottom two (one being the fuel pump relay) get nothing..


Last edited by M spec; Fri, Jan-17-2020 at 08:24:16 PM.
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Old Fri, Jan-17-2020, 09:00:04 PM   #10
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Default Re: e46 m3 starts then dies (possible ews)

I already had these symptom : the engine start and died immediatly after, it was the maf...
Try to start with the maf unpluged
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Discussing e46 m3 starts then dies (possible ews) 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)