M20B25 conversion lives!!!!!!!!!! Yaaaaaaaaaaaaaaaaaaaaaaaay

[varden]

02mick wrotebut on a compleetly different note do you have any plans with your old engine, or head ?
Thanks mick[/b]

Gudday mick, its probably going to be cannibalized for parts, i.e the head, the rods, the dizzy etc but not before i use it as a bench for my triple 45mm DCOE side draft set up that will be making its way onto a 2.7 stroker motor i have sitting in this car.


The stroker will go into the e21 and the 2.5 will prolly end up in a 318i 2door e30 with the 325e acting as donor car.

By anyway....back to the conversion....I poured over the ecu pinout chart from http://www.e21bmw.net/tech/motronic.php and i can only find three wires that have anything to do with the ecu that i actually get to play with.

In other news.......

murran wrotefuel pump is simply earthed and fed live via the violet/red, pin 13 (id suggest putting an in line fuse in this just as it comes out of the c101 connector.

It seems I've taken this advice too literally and put a 7.5 amp fuse into my 323i circuit that actually requires a 25 amp fuse, I'm not even sure that i even need to bother with a fuse at all as my 323i has one built in where as murrans was a 320 carbie that had a modded e30 pump ( which i will assume had a 7.5 amp draw) in order to feed the EFI.

SO after blowing two 7.5 amp fuses I've come to the conclusion that i need to sort this fusing issue if my car is to start.

I also noticed that my crank sensor was bent on its mounting bracket, its been panel beaten back into alignment now....just how robust are these units?? I had a good hard look at it and it only seems to have two wires running into some kind of magnetic switch with two other wires running the length of the lead with a braided coaxil sheath over the lot....hopefully its not busted.

I do have voltage on the coil now too.

So the next thing to do is to jumper the fuel pumps as i have done in the past with my kjet dramas and see what happens next.

[murran]

ah so you using the 323i standard pump? you see i didnt know that!

[varden]

Well i put the required 25amp fuse into the circuit to the fuel pumps, the car has fat spark, but still no start...

Cranks over, i can hear stuff in the engine bay humming and clicking but she won't fire up.

I've been trawling the net some more and found this motronic e34 m30 to e28 swap page and it looks the goods.

http://www.m535i.org/officers/ra/frame.html

I will go over it in the morning, if my 3 month old daughter lets me sleep tonight.

[--ALPINA--]

do you have fuel from the pipe to the fuel rail? have you checked to see if the electrical rail is giving power to the injectors? have you connected the injectors on the engine loom? if you getting spark, fuel and good pressure then the problem sounds like power to the injectors.. without power the solenoid wont activate the pin to open and let in fuel thru the chambers..


check for power on the injector power rail!! bet thats the fault!! even one cable along there can stop the whole lot from working..


J

[Thayat]

Hope the fault finding works Varden. I spent the day making the blanking plate for the bellhousing and following your lead with the loom. Though mine is subtley different. Unfortunately, after connecting 90% of it up I noticed a nick out of the cable sheathing, which is down to the copper...very very unimpressed.

Looks like I should try to locate another loom now.

Question if you don't mind. There is a two pin plug that I couldn't find a home for. Any ideas?

Cheers

[varden]

ALPINA wrote:
do you have fuel from the pipe to the fuel rail? have you checked to see if the electrical rail is giving power to the injectors? have you connected the injectors on the engine loom? if you getting spark, fuel and good pressure then the problem sounds like power to the injectors.. without power the solenoid wont activate the pin to open and let in fuel thru the chambers..


check for power on the injector power rail!! bet thats the fault!! even one cable along there can stop the whole lot from working..

solenoid? where is that located?

Is that connected to the vacuum line that goes to the fuel pressure regulator??

Which plug powers the injectors?

The one on this link?
http://www.strictlyeta.net/technical/328i/harness07.jpg

I don't remember unplugging such a plug at any point but then i had help pulling the manifold off.....

I will check.


I just checked, the plug is different but its plugged in, i will push all six pins together in the plug in the morning...

Thayat wrote:

Hope the fault finding works Varden. I spent the day making the blanking plate for the bellhousing and following your lead with the loom. Though mine is subtley different. Unfortunately, after connecting 90% of it up I noticed a nick out of the cable sheathing, which is down to the copper...very very unimpressed.

Looks like I should try to locate another loom now.

Question if you don't mind. There is a two pin plug that I couldn't find a home for. Any ideas?

A nick in the cable? electrical tape is your friend, or if your really keen cut, solder and heat shrink.

Spare plug? coloured or black? the two spares i had were for the charcoal cannister solenoid under the manifold ( i hope) and the low oil warning light, both black i think.

[--ALPINA--]

Ok, the injectors are literally solenoids electromagnetic.. where the electrical rail is connected on the injectos there should be a plug with a round connector that conects to the engine loom, i tell you thats the problem man you havent connected it if you dont remember. you need to take more pic to post for me . pix at the front of manifold showing the injectors and the electric power rail, or either you didnt plug in the power rail at all

Take a picture of the fuelrail with injectors....... and post that

[Thayat]

Hey mate. The nick is in the trunk of the loom unfortunately. I'm a little paranoid about patching it as a consequence. I guess we shall see how easy it is to find a replacement before I rule it out altogether though...



As for the plug, its a black two pin of the same style as the bulk of the three pin versions on the loom. I will check the E30 wiring charts for colours when I head up to the car today.

Cheers

[varden]

ALPINA wrote:

Ok, the injectors are literally solenoids electromagnetic.. where the electrical rail is connected on the injectos there should be a plug with a round connector that conects to the engine loom, i tell you thats the problem man you havent connected it if you dont remember. you need to take more pic to post for me . pix at the front of manifold showing the injectors and the electric power rail, or either you didnt plug in the power rail at all Laughing Laughing Laughing

Take a picture of the fuelrail with injectors....... and post that

This is a picture of the six pin plug that connects the engine loom to the fuel rail, it looks to have been put in as a substitute for the round plug.


I was back out in the shed today, i def have spark and fuel to the regulator and at least one clicking sound from the throttle body and a buzzing sound coming from that large solenoid attached to the manifold.

I need to sit down and work this all out THEN cut away the sheath to the wiring harness and physically inspect every wire to make sure it wasn't damaged when it was removed from the 325i.

Bloody hell....!!!!!

Thayat wrote:
Hey mate. The nick is in the trunk of the loom unfortunately. I'm a little paranoid about patching it as a consequence. I guess we shall see how easy it is to find a replacement before I rule it out altogether though...

Hmmmm....looking at that pic it look gouged and a few of the copper strands look to be butchered too, at the very least i'd be cutting off the sheathing and mending all the damaged wires to prevent shorting between wires.

btw if you get your car started before i start mine could you let me in on the secret??

[varden]

It f@#king goes!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!



Yeeeeeahhhh!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

After all that I HAD THE FUEL LINES SWITCH AROUND THE WRONG WAY!!!

I would have thought that pump to regulator would have been the logical answer but apparently its pump-rail-regulator-return pipe.

Youtube link to follow later as my camera battery is currently charging and my wife has already requested some quiet so our daughter can get to sleep.

[varden]

PROOF!



yay!

[e21-Mark]

Let us know your thoughts on the added performance.

[Thayat]

Fantastic Varden!

Brilliant work. You must be chuffed.

I don't suppose you could show us a pic of the fuel line hookup...could be quite valuable when i finally get my fuel pump and the wiring fixed.

Well done mate.

[J.K.jr.bad.]

how old are you? in the video it sounds like you are a pensioner.

btw I had the same mistake with fuel lines when I was installing EFI.

[--ALPINA--]

do you have fuel from the pipe to the fuel rail?

I did mention it, its a very easy mistake to make, its happened to me.. piping the otherway round wont have any pressure to start..


Well done thou you finally craked it..... now only one thing to do and which the e21 was simply made for (323i) is to thrash the f--k out of it i.e floooor it!!!

J