Quote:
Originally Posted by timbo
Hi everyone
Thanks for your words of encouragement! Can anyone help with these questions?
1. I think part of the wiring problem is that its an E46 engine but the immobiliser (EWS 3) (and key transponder I guess) are from an E39. Is this workable? Has anyone wired up an EWS 3 ?
2. The Marlin speedo says its operating voltage is 20-30. Do I need a voltage doubler in there somewhere?
3. The premier wiring loom has a wire for the rear fuel pump but not the front one. Can I just wire both pumps together from this single wire? I found a wire on the ECU for the fuel pump relay, maybe I should be using this + putting in a relay for the front one?
Also, has anyone fitted the Marlin supplied exhaust system with side intakes?
Thanks
Tim
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Hi Tim,
1. i'm just studying the e46 wiring diagrams at the moment. My car is running with an e30 M20 engine, but the e46 M52 is a lot more complicated and sitting on an engine stand right now! I've also invested in an e46 Bently workshop manual which is american but has all the wiring diagrams printed out so easier to follow. My understanding so far is that you need a DME (ecu) and EWS and key that are all matched and from the same car. Whether a DME/EWS/key from a e39 car will work on an e46 engine, I cannot comment (but Patrick might know as he is our resident BMW expert!)
I plan to draw out the EWS wiring to make myself a wiring diagram with the minimum set of connections. Perhaps you can test it for me?
2. I didn't by the Marlin speedo but as Robin says it does sound odd. On the e30 diff there is a speedo sender that works fine with my Autometer gauge. Not sure if the e46 diff has the same....
3. I used the Premier loom. I have a low pressure pump at the back of the car that pumps fuel from the tank up to the swirl pot. (Do you have a swirl pot?) I used the premier pump lead for the low pressure pump and that runs continually when the ignition is switched on. The high pressure pump should be run from the BMW fuel pump relay that is operated by the DME. It's one of the two relays I can see in your photo on your Flickr site.
accordng to the Bently manual it'll have the following leads:
DME pin 10 -> White/Violet (thin wire) ->Relay pin 4
Fuse 3 20A (engine fuses) -> Red/white (thin wire) -> Relay pin 8
Supply via 15A fuse ->Red/Violet (thick wire) -> Relay pin 6
Relay pin 2 -> White/Black (thick wire) -> to Fuel pump +ve terminal.
The -ve pump terminal goes to chassis.
Hope that helps,
Peter