help:wiring m50 swap in a ti so i have the swap almost complete with exeption of the wiring anf a few misc items. the m50 is from a 1995 325is and its now installed into a 1997 318ti. the only issue im having is with the wiring from the m50 engine harness to the body harness of the ti. if anyone has a pin out of the two engines and o diagrams that would help post them up thanks in advance |
so you need to get your swap back to OBDI? check out Bluebimmas thread here if you can sift through all the pages, I believe it has information on how to do it, and its not that difficult IIRC. All the other wiring should be plug and play (twist off caps) did you take care of the EWS and everything else? |
as far as the wiring goes im pretty much starting from the begining. ive got a complete harness from both engines, the engine has been cranked (my buddy neglected to remember the ews module) so will i still be able to bypass that without any issues? also i now have a scematic to the 318ti to use as a refrence. all thats left of the swap is converting the obd1 m50 to the obd2 318ti and bolting on the front end and if i can finish it tonight the entire swap from blown m44 to m50 will be a grand total of 3 days and way under budget. btw what can someone expect to do this swap for? |
Swap costs are all over the board. Depends on the engine you went with, how many of the swap parts you got with the engine, how many things you broke along the way, etc. EWS can be bypassed. Plenty of info on that around. Plenty of info on ODBII to ODBI. Not sure about the other way though. Most go II to I because its easier to tune. |
EWSII cannot be bypassed easily.. it has to be deleted from the DME. If its easier than that, then I paid way too much to have it removed from the DME :P Not sure if you have EWSII with your 95 motor though. Did you find the "how-to" in Blue's thread on how to convert OBDII back to OBDI yet? Keep us posted! |
thansks for the info on the obdII to obd I conversion. i completed this wiring and seem to be getting fuel but no spark. any ideas? could this be the ews? also i will post up some pics of the swap from start to finish just for fun |
pump priming but no spark, sounds like ews to dme to me |
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hmmm.... fuel, but no spark? that doesn't sound like EWS to me... at least not EWSII. When I was having issues with my EWS... it would crank over, but I would get no fuel nor would I get any spark... Is the wiring harness setup for a rear battery? If so, its possible to confuse all the power wires and end up grounding one by mistake, there should be 3 power wires. Before you get too concerned, if it is a EWS issue, then it is easy to get rid of on OBDI cars. Im sure there is some bypass information out there, or if you don't want to go that way, I believe TurnerMotorsport has a EWS delete chip for OBDI DME's and its under $200. |
im almost positive that i have the power and ground correct but i only found the main power and starter power wire. whats the third supposed to be? also im confused in the step labeled as #30 the connector pictured is among none that came on either harness(318ti and 325is) |
Dont cut that connector off like it says to do, its very much so unneeded. Ill get you pics in a few minutes, you dont have the power and grounds right from the sound of it. |
Thought i had my camera here with me, but i guess not. |
the car is set up for a front battery and there are two power wires connected to it wich looks right comapred to the diagram posted (thanks Bluebimma) the only thing i think i need to figure out is the main connectors. i obviously dont have the automatic connector but the one small connector i have from the ti only has 4 wires in it as opposed to bluebimma's that had eight wires. and i only have two large connectors on the 325is engine harness, the x20 and another with only four wires but there different colors that the smaller one from the ti |
The really small one on the drivers side is for the MAF sensor. If you take a pic of what you have right now, i can draw on the pic for you. |
just to clarify on the power wires, i don't know if its just an OBDII thing, or a M52 thing in my case... but when I said setup for a rear battery, i meant was the M50 motor setup for a rear battery in the 325 it came from, not your Ti. Id have another look at the power/grounds. The 3 power wires I had were - A) starter B) main and cabin functions (so it seemed anyways) C) and then the one I had grounded by accident seemed to control the DME functions, like fuel pump, spark, etc. If its got any RED on the wire at all, its power. |
One of the main power lines is black. All non-ti e36s have the battery in the rear but are set up in the same manner when put in a ti. |
good to know bluey! then he definitly has something wrong if he only has 2 wired up. |
for the smaller connector ive got one other than the maf with only 4 wires. and the car it came out of seemed to have a front mounted battery, also i cant find the third wire that connects to the battery. where does it come from and what color wires are in the loom? on a whim i connected the black wire that seems to be the ground under the diagnosses por to the battery and it lit up the guages withe the key out, that loom seems to only have brown wires in it. that is a ground right? at this point im thinking it may not be an obd1 engine. the car was made in july of 95. didnt bmw switch to obd2 half way through 95? ps: thanks for the help fellas |
All m50s are OBDI, there is no variable there. The other connector, is it circlular like it belongs to something major, or is it to the traction control throttle body? All non-ti are rear battery mounted man, the connections to the battery are in the front though along with the diagnostic port. Two lines come from diagnostic port harness. The other is the main power which is positive. Went back out to the car and noticed that i had a few things wrong...thats what happens when you do things from memory. :P http://i123.photobucket.com/albums/o...Layout11-1.jpg |
the other4 wire connector i have is identical to the x20. correct me if im wrong the x6031 from the ti only has 4 wires as well. the two connectors do not have the same color wires. above the diagram seems to only show two wires running to the battery(or maybe im confused) also for the x6031 plug it states that we dont us it and just cut all the wire, correct? ill post pics of what i have in a few minutes |
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Im still pretty sure you need another power wire hooked up there... I don't have my car for reference at the moment though... but it could very well be different since im all OBDII and using the M52. |
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Dont cut the harness off like that pic says above, its a waste of time and youll ruin the harness. |
Also, do you have a base, sport, or active package? |
im still confused because the connector on the right has far too many wires compared to mine. are thes different options im assuming. the four wires on mine are all white with varios color tracers, also should i use the orgional connector from the ti or the one from the is to do this? im unsure what package the car has, (fully loaded exept fog lights) i apologize for my shortcomings of e36 knowledge, im still learning the bmw stuff. lol |
Well, looking at your harness and such, youre obviously missing some prongs on the second connector. Do you have the three-button On-board computer that is installed just to the right of your stereo headunit? Do you have cruise control? If anything, you should be able to do the swap using the numbers posted up above on the corresponding connector. As far as harnesses go you should be using... M50 Complete engine harness 318ti chassis harness M50 DME (ecu) When doing the OBDII to OBDI swap youd also be defeating EWSII and in the end you should have EWS0 meaning no EWS at all. When you make these simple connections (changing the chassis harness lines) you completely defeat EWS. Another question i have for you, is the label on the ecu silver or red? It should be red in order to do this properly though youd be able to defeat a silver ECU EWS by cutting the line to the EWS function. Also, did you slide the ECU into the pronges in the firewall or just sitting somewhere just in case you need to do something else with it? It gets grounded when you put it in the firewall. |
the car does have the on board computer and cruise controll. i believe the label is silver but ill check when i get home. the ecu is in the firewall and bolted down, ill check that out again too. |
M50 Complete engine harness 318ti chassis harness M50 DME (ecu) but exluding the connector with only 4 wires (in may case) correct? |
Im really not sure what that 4 prong harness is for. The two tis i put m50s in didnt have these, one being an 97 active package and the other being a 99 sport package. I have a non-vanos in mine he has a vanos engine in his so i dont know why yours is different. http://i213.photobucket.com/albums/c...13-08_1616.jpg From this pic, it looks like you have the large connector (x20) then in the background, there is another connector that resembles the x6031 connector, am i wrong? How about a pic from slightly further away from all the wiring when you get a chance. Theres no way your ti is different from all the other tis with another engine in them. |
ya the one in the background resembles the x6031 but is the size of the x20. it has the same number of wires ant the x6031 but there all diferent colors besides the light grey wire. ill post a better picture around 4:00 i dont see why this car would be any different either, hopfully we can figure this out soon my antisipation is growing. if i get it running tonight ill post up some pics of the overall project. |
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Im totally lost as to what you guys are trying to figure out... lol are you done with the OBDII < OBDI? if it has to do with that twistcap with the 4 tracer wires, I had that connector on my M52 harness, and it connects to nothing since the middle "plug" on the Ti harness is the diagnostic port which goes with the 4cyl harness and the diagnostic port on the new harness is now by the battery. So I just taped it down in the empty hole. |
Man, from the looks of it, you were cutting into the M50's harness, not the chassis harness, correct me if im wrong. All changes need to be made to the chassis side of the harness, nothing on the m50 harness itself. Its actually plug n play after you change the few chassis wires. |
ya a buddy of mine jumped in all willy nilly and i trusted him because he done numerous 2jz swaps into mkII supras, but i realized id much wrather do this myself wrather than save time by working on something else while somone is cutting up my wiring harness lol. anyways to update a bit. when im cranking the engine it seems to be firing on a few cylenders but wont start yet. the engine has been sitting for about a year. could the coils have gone bad? |
Coil packs do go bad but you need to individually test them. |
alright i tested the conectors coming into the cpils and there not getting signal. also the way its wired the turn signals dont work, the drivers side corner doesnt lite up and theres a few other issues. |
Sounds like your engine harness isnt properly setup still for some reason. I had the same problem with mine. It wouldnt activate the windows nor lighting properly until i had the leads correct. Wish i were there to see exactly whats goin on. If none of the coil packs are getting power, did you check and make sure youre getting fuel? If youre not getting either, check your crank position sensor at the front of the block above the crank pulley. |
Sound like your power and ground wires are mixed up. Obviously mine is right hand drive so i will convert this into left hand drive. Two wires come out of the passenger side of the blukhead trunking, (which is now M50 harness) along with the OBD port/round connector, One is a thick red wire inside a black corrugated plastic shielding, The other is a thinner all black wire. Both of these have ring terminals on the end. Join these together temporarily with a nut and bolt. These origonally connected to the battery positive post under the bonnet (hood) of the 325is. Ti doesn't have this. One is a constant live (connected to battery via wiring inside trunking) and the other needs to be made live (the smaller of the two.) Coming out of the drivers side of the trunking there are two main bundles of wire in rubber corrugated shielding.One has your DME connector with a black wire with a ring terminal on the end coming from the trunking. Earth this. (FELLOW SWAPPER PLEASE CONFIRM THIS) The other bundle has a thick red wire with a large ring terminal. Tape this up temporarily as it is already made live by the joining of the two wires on the other side of the trunking. Also there is a smaller red wire inside black plastic corrugated shielding. This connects to positive post of fusebox. You will need to reuse your old wiring from the M44/M42 battery to connect to the starter. PHEW- that took some time to write. Hope this helps (may be slightly different due to LHD/RHD layouts. I grounded one of the two wires that join together first time round and had exactly the same faults as you have. MATTY |
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