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04 z4 e85 - Crank but no start
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04 z4 e85 - Crank but no start
Hey all,
I came back from university during the winter to find my poor z4 cranking without a start. This has continued through a new battery, and a jump start, that is to say it just cranks.
The only clue so far is that the “shrader valve” on the fuel rail doesn’t seem to be getting fuel at all (Personally, i am unfamiliar with how that system works and any information would be appreciated). We are unsure of if we can hear the fuel pump working, but it’s our only lead. We have adequately filled the tank, so it’s getting gas, and have checked the related fuses.
I have seen things about a EKPM, or the control module for the fuel pump, but the location i found for it was incorrect. I ripped up the trunk lining of our “parts car” (same car, just more mileage) to check its location and it was not there. My model is a 2004 z4 2.5i base package. There is no security, or any of the premium features, just as basic as can be.
Any help would be appreciated,
Thank you all
I came back from university during the winter to find my poor z4 cranking without a start. This has continued through a new battery, and a jump start, that is to say it just cranks.
The only clue so far is that the “shrader valve” on the fuel rail doesn’t seem to be getting fuel at all (Personally, i am unfamiliar with how that system works and any information would be appreciated). We are unsure of if we can hear the fuel pump working, but it’s our only lead. We have adequately filled the tank, so it’s getting gas, and have checked the related fuses.
I have seen things about a EKPM, or the control module for the fuel pump, but the location i found for it was incorrect. I ripped up the trunk lining of our “parts car” (same car, just more mileage) to check its location and it was not there. My model is a 2004 z4 2.5i base package. There is no security, or any of the premium features, just as basic as can be.
Any help would be appreciated,
Thank you all
- enuff_zed
- Lifer
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- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
04 z4 e85 - Crank but no start
Could well be the fuel pump.
The other thing that causes those symptoms is the EWS (immobiliser) so really you need to check the codes first.
The other thing that causes those symptoms is the EWS (immobiliser) so really you need to check the codes first.
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04 z4 e85 - Crank but no start
From the research i have done, the EWS will lock the wheel and there will be no crank. We have read the codes, and for some reason there seem to be plenty, and as i have asked here before, mostly they are related to options that are available with my wiring harness, but did not come packaged with the car. Is this typically the case, or would EWS simply cut fuel, and allow the starter to crank?
- enuff_zed
- Lifer
- Posts: 14809
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
04 z4 e85 - Crank but no start
I had an ongoing saga with a faulty DME. With bigwinn's help we eventually fixed it, but as part of our investigations we fitted a new DME but did not remove it's link to the EWS. We got faults telling us there was an incompatibility but the engine still cranked, it just would not fire. So the EWS must stop the fuel pump from running, or maybe cancels out ignition. but the starter still turned the engine over ok.
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04 z4 e85 - Crank but no start
Update: the rear sub grille for the passenger side seemed to be coming off, so i opened it up and found a rats nest and a chewed wire. Pictures are attached but seeing as how it’s so close to the fuel pump, i figured i should see if anyone knows which wires they are.NewToZ4 wrote: ↑Sun Jan 14, 2024 10:26 pm Hey all,
I came back from university during the winter to find my poor z4 cranking without a start. This has continued through a new battery, and a jump start, that is to say it just cranks.
The only clue so far is that the “shrader valve” on the fuel rail doesn’t seem to be getting fuel at all (Personally, i am unfamiliar with how that system works and any information would be appreciated). We are unsure of if we can hear the fuel pump working, but it’s our only lead. We have adequately filled the tank, so it’s getting gas, and have checked the related fuses.
I have seen things about a EKPM, or the control module for the fuel pump, but the location i found for it was incorrect. I ripped up the trunk lining of our “parts car” (same car, just more mileage) to check its location and it was not there. My model is a 2004 z4 2.5i base package. There is no security, or any of the premium features, just as basic as can be.
Any help would be appreciated,
Thank you all
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- Member
- Posts: 89
- Joined: Sun May 30, 2021 5:01 pm
04 z4 e85 - Crank but no start
Thanks, that’s interesting definitely. I will be there later tonight to re-scan it and have a look at the chewed wires i posted here. Just curious though, i know to relink you have to have a specific software and possibly input the vin, and im just wondering what your eventual fix was?enuff_zed wrote: ↑Tue Jan 16, 2024 8:11 pm I had an ongoing saga with a faulty DME. With bigwinn's help we eventually fixed it, but as part of our investigations we fitted a new DME but did not remove it's link to the EWS. We got faults telling us there was an incompatibility but the engine still cranked, it just would not fire. So the EWS must stop the fuel pump from running, or maybe cancels out ignition. but the starter still turned the engine over ok.
Last edited by NewToZ4 on Tue Jan 16, 2024 8:25 pm, edited 1 time in total.
- enuff_zed
- Lifer
- Posts: 14809
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
- enuff_zed
- Lifer
- Posts: 14809
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
04 z4 e85 - Crank but no start
So the DME powers the Fuel Pump Relay (unless the EWS tells it not to I guess?)
Check Fuse F33 to ensure that the relay can be powered.
Then check Fuse F19 to be sure that power can pass through the relay to the pump.
Looks a pretty simple circuit to the pump.
A brown earth and a white/blue power supply.
Check Fuse F33 to ensure that the relay can be powered.
Then check Fuse F19 to be sure that power can pass through the relay to the pump.
Looks a pretty simple circuit to the pump.
A brown earth and a white/blue power supply.
- enuff_zed
- Lifer
- Posts: 14809
- Joined: Wed Oct 26, 2016 11:05 am
- Location: Attleborough, Norfolk
04 z4 e85 - Crank but no start
The fuel pump Relay (K6301) is mounted on the rear of the fuse box.
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04 z4 e85 - Crank but no start
Those fuel pump fuses were checked, along with a couple others that could’ve been related and the relay is fine. We ended up taking off panels to try and reveal the wires to see if more were chewed (didn’t find any), and found more rats nest to clean. No progress on the actual fuel pump problem, besides having access to the chewed wires that may or may not be related.enuff_zed wrote: ↑Tue Jan 16, 2024 8:30 pm So the DME powers the Fuel Pump Relay (unless the EWS tells it not to I guess?)
Check Fuse F33 to ensure that the relay can be powered.
Then check Fuse F19 to be sure that power can pass through the relay to the pump.
Looks a pretty simple circuit to the pump.
A brown earth and a white/blue power supply.
Side note: i have noticed that the lock from the inside does not work, i can only use the key to lock it. Not sure if that indicates anything about the state of the vehicle, but the hazards work and i have never had this happen before
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04 z4 e85 - Crank but no start
I checked the codes, and have some EWS and DME,
EWS CODE(1):
00000F - Voltage supply of ews3 module
DME CODE(4):
00299A - CAN fault management EGS
002746 - Digital Motor Electronics, Cylinder 2 Misfire
0027C7 - Digital Motor Electronics, Main relay, switching delay
0028B2 - Digital Motor Electronics, Speed limitation, reset
There’s other codes too, mostly for open circuit stuff that my car doesn’t have, just has the wiring for it. The code for the EWS3 I read is somewhat common, and to test the voltage directly, but it didn’t give a good way to do that, if anyone has any tips