flyboyX's obd2 s52 engine swap blog

[flyboyx]

i worked on my fault codes a little today and found a couple of interesting things. i reset my dme and the o2 sensor adaption limit codes went away. the fuel injector cylinder #1 and air mass sensor codes also disappeared. that leaves me with the 4 o2 sensor codes that i am not concerned with right now. i also have fuel pump relay and evap systems running losses valve.

i spent a lot of time playing romper room with my etms and found out a couple of interesting things.

the fuel pump relay is non existent in my wiring. this relay was located on the engine harness of the m42 and in the body wiring of the 2000 mz3. wtf? I thought it seemed kind of stupid to connect a tiny little 5 amp wire from my s52 engine harness to a 15 amp wire of the e30 body harness. anyway, i am going to add the relay from the e36 back into the system and i am pretty sure that i will be good to go on this.

the evap systems running losses valve has given me an idea or two by looking at the e36 etm. there is a yellow/blue and a red/white wire two prong plug that feeds power to the valve. it is located underneath the body near the driver's feet. if i hook it up correctly, i think that should eliminate that code(hopefully)

even though it hasn't come up yet, i know i am going to have a problem with the speed signal output. i don't have the #14 black/white e30 wire connected to anything. i am still trying to figure out which pin it goes to on the dme. i printed off pin assignment chart for the siemens dme, but nothing there is very obvious. i'm probably going to have to cross reference it by checking the etm of an earlier model.

[MIKe30]

I don't know how my fuel pump relay is wired. Suprised you don't have a #9 pin on your harness. Do you have a brown/red?

[flyboyx]

I don't know how my fuel pump relay is wired. Suprised you don't have a #9 pin on your harness. Do you have a brown/red?

sure, i have a three brown/reds on the x20.
pin #1 is the oil temp
pin #2 goes to the chassis computer of the anti slip.
pin #23 is the oil pressure switch.

my x6031 plug has green/red that is listed as data link to instrument cluster pin #13. this one would be my best guess at this point without actually enough info to make an educated decision. i need to know what pin at the siemens dme corresponds to speed sensor.


on another note, i did some more trouble shooting today and made more progress. i added a fuel pump relay to my harness. it works like a charm and the code went away. an added benefit is that i don't have to sit there and listen to the fuel pump continuously drone away when the key is in the accessory position.

i also have the "evaporative losses valve" code extinguished. as matt mentioned, this is the electrical plug on the obd2 fuel pressure regulator. i had the wrong set of wires on that socket. i believe i had the wire for the reverse switch installed there. they are exactly the same plug for some stupid reason.

i plugged the rear o2 sensors into their sockets even though the exhaust isn't hooked up. that takes care of two more 02 sensor codes. the only codes i have left are pre cat o2 sensor heater 1-3 and precat o2 sensor heater 4-6.

i know that when i raise the rpms above idle,i will have the speed sensor code as well. as i mentioned, i just need to figure out what pin on the dme to connect my c101 #14 road speed signal wire to and i believe that i will be in good shape.

as a benifit, the engine once again idle's nicely for as long as i have the key on without stalling.

i'm sooooooooooo close!!!!!!!!!

[MIKe30]

good job. Looks like I'll have that evap losses forever if there isn't a way to dummy off a set of contacts somewhere. I'm running an obd1 fuel rail because I needed a pressure regulator and one integrated with the fuel rail was the first I could find.

Going to go work on mine now. Btw, you're VSS code probably won't show up until you drive it around a few miles. It didn't show up after I drove it up and down the street at all. Took a 15 mile drive home from the exhaust shop to get mine to trigger.

[flyboyx]

good job. Looks like I'll have that evap losses forever if there isn't a way to dummy off a set of contacts somewhere. I'm running an obd1 fuel rail because I needed a pressure regulator and one integrated with the fuel rail was the first I could find.

Going to go work on mine now. Btw, you're VSS code probably won't show up until you drive it around a few miles. It didn't show up after I drove it up and down the street at all. Took a 15 mile drive home from the exhaust shop to get mine to trigger.

you can get rid of it pretty easily two different ways. someone probably can delete it from your software, or you could go to a junk yard and find an 96 or newer e36 325i. take the fuel pressure regulator from it. install it in your fuel lines and go back to your obd2 fuel rail. you can carefully bend the lines out a bit where they connect to the hoses so they fit around your obd1 manifold. i don't think that part would cost more than thirty or forty bucks at a junk yard. i have a photo of mine installed a little further up this thread. hell, mike, you've come this far, why not go the full monte?

[MIKe30]

you can get rid of it pretty easily two different ways. someone probably can delete it from your software, or you could go to a junk yard and find an 96 or newer e36 325i. take the fuel pressure regulator from it. install it in your fuel lines and go back to your obd2 fuel rail. you can carefully bend the lines out a bit where they connect to the hoses so they fit around your obd1 manifold. i don't think that part would cost more than thirty or forty bucks at a junk yard. i have a photo of mine installed a little further up this thread. hell, mike, you've come this far, why not go the full monte?

because I just want to DRIVE it. might be a winter project. and unfortunately, the way this is looking my entire car might be a winter project again. This is driving me nuts. I updated my other thread.

[flyboyx]

the other day i purchased a used a/c fan from one of the members who is parting an e32 750i with the v12. i am planning to try that in place of the spal pusher that most people use to keep the coolant temp down. it is needless to say, a lot bigger and has about twice as many blades as the stock late model e30 fan. the shipping hasn't been too prompt, but when i get it, i will post some comparison pics and let you all know if i can fit it in the core support. the mounting brackets will need some modification, but the good news is that if it works, it only cost 15.00 plus shipping.

[flyboyx]

my aux fan arrived in the mail today.(finally) it looks pretty promising. it is going to require some modification of the brackets to make it work. here is a comparison pic of the late style e30 a/c fan next to the one from a 750il. as you can see, the blades are a completely different style. even though it looks like they should spin on opposite directions, both are designed to spin clockwise. that thing ought to push some serious air!

[MIKe30]

Nice, I'm going to need to add a fan soon too.

[flyboyx]

Nice, I'm going to need to add a fan soon too.

man, i wish i would have known, the pick a part here had the same fan. i didn't buy it because they wanted 45.00. plus tax plus core plus my little finger, plus my first born.

[MIKe30]

man, i wish i would have known, the pick a part here had the same fan. i didn't buy it because they wanted 45.00. plus tax plus core plus my little finger, plus my first born.

It's no big deal. My buddy said he has a fan that I can borrow for a while. It's not going to matter either if I can't get the bitch running anyway.

[SS350]

I had a pick-ur-own part tell me they wanted $25 for a kidney grill from an 86 e30 that has been sitting there for... 2 year? i think.... all I wanted to do was paint it black so i can run chrome or black depending on the day.... I think that was pretty rediculous myself

Brian, sounds like you are close, I ended up getting a puller fan for mine from summit - came in a BeCool box but was a Spal... now i just need to hook it up to the AC switch.

[flyboyx]

I had a pick-ur-own part tell me they wanted $25 for a kidney grill from an 86 e30 that has been sitting there for... 2 year? i think.... all I wanted to do was paint it black so i can run chrome or black depending on the day.... I think that was pretty rediculous myself

Brian, sounds like you are close, I ended up getting a puller fan for mine from summit - came in a BeCool box but was a Spal... now i just need to hook it up to the AC switch.

hey man, i haven't heard from you in a while. send me a pm and let me know how your swap is going.

for your fan, can't you just splice the wires into the original three wire plug that powered your fan? that is what i plan to do. this way i get low and high speed when it gets really warm. that way it comes in automatically and you don't have to worry about turning it on manually.

[flyboyx]

i have been piddling with the car in my spare time over the last couple of weeks. i haven't gotten a lot accomplished because of other things going on in my life. however, i spent some time working on installing that e32 pusher fan. i opened up a slot from underneath in the upper part of the radiator core support so the larger diameter fan can recess in there about an inch and a half. i made an extension plug from the fan wires off my old unit and part of the wiring harness from one of my parts cars. i need to weld up some mounting brackets for the two lower mounts, but otherwise i am good to go with this. i will post a photo when i finish it up. my air conditioning system was still holding a good vacuum when i pulled it apart to work on this.

i ordered a supercharger bracket from white325is. i also purchased a vortech supercharger to hang on it. i still need a lot of parts to install this correctly on my car. at least if i have the big pieces, i can get any components adjusted and brackets welded in my engine compartment before the car goes off to paint. it will be some time before i actually install this on my car, but at least i can start preparing for it now.



i purchased a few dash clusters last week. i bought this s14 cluster from a member. it has been taken apart already and some of the parts aren't original(white needles, motometer bezel), but i get a 160mph speedo, 8 grand tach and oil temp gauge. assuming everything works or is fixable, it will suit my needs perfectly. i know of a local guy with a parts m5. i will probably go over there and get his s38 coding plug.



i also purchased a couple of alpina clusters from euro egay. between these three and the 5 or 6 other clusters i have from parts cars, i should wind up with a few really rare clock sets. i will probably sell off the alpina cluster with the 260kph speedo after i go through it to make sure everything works.

[Aatos]

How did you install the EWS ring antenna and key stuff? Did you actually fit the e36 lock to e30 steering column?

My solution was to dremel enough clearance on the e30 column and then move the transponder ring antenna over the original e30 ignition lock. Then I moved the transponder chip from the e36 key to an aftermarket remote fob and had fobs' blank key keyed to the e30 ignition lock.