24V Swap info

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24V Swap info

Postby ten2doyle102 » Sun Oct 07, 2012 8:12 pm

Yep, kinda figure that I should do this now cause I don't think I will have much time/money for this when baby comes.... Lol. I'll update my thread when there's progress!
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Re: 24V Swap info

Postby ten2doyle102 » Wed May 27, 2015 7:03 pm

Quick question, is there any major differences between wiring an m50 and a s50? I am trying to help my buddy get his s50 running but when you turn the key nothing happens. Seem to have power at the starter, have power at the e30 plug but nothing to the signal wires on the starter. He said he got a chip for the red as well.

I will say that he is trying to use an automatic S50 harness... Not sure if this means things should be connected differently.
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Re: 24V Swap info

Postby M20_fever » Wed May 27, 2015 7:39 pm

Does he have power at the DME?
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Re: 24V Swap info

Postby Yoshi » Wed May 27, 2015 8:16 pm

I believe the DMEs are different. But I also think auto harnesses aren't' the same as manual.

Regardless, the engine should turn over but not start even without the DME plugged in. Make sure there's good engine grounds (my go to) and that there is the big fat cable from the main pos terminal attached correctly.

subsequently, you should start a new thread on this :)
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Re: 24V Swap info

Postby ten2doyle102 » Wed May 27, 2015 8:44 pm

I suppose I should have.... Feel free to move this if you so choose. :)

I haven't gotten to check the grounds or the power at the DME yet. I'll try to get there tonight to look at it.

I followed AKG's wiring sheet as well. I couldn't find anything specific to the s50. They all seems to be for the m50.

Yoshi, did you have a diagram from when you had the s50? (I think you had an s50 at one point... lol)
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Re: 24V Swap info

Postby ten2doyle102 » Wed May 27, 2015 8:45 pm

The one odd thing I noticed was that one of the starter wires on the e30 side was a bigger gauge than the one on the e36 side it was called to connect to per the AKG site. Leads me to believe something aint right!
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Re: 24V Swap info

Postby Yoshi » Thu May 28, 2015 2:08 pm

I think the M50 and S50 harnesses are the same. x50 and x52 are different. I also don't know about auto to manual. I just used my M50 harness and got a chip for my S52 so that doesn't really apply here.

Regardless, this has nothing to do with that. NOTHING! For the C101 connector, the only one that matters to get the starter cranking is the yellow and black wire (on both sides IIRC. Def E30 side). That signals the starter to start turning. From there, you got a thick as 0 or 00 gauge red wire that comes off the pos terminal on the passenger side of the bay. Then you need the engine ground. There might be an unloader as a 4th wire so check that. But that's the same as the yellow/black signal wire.

No other wires are necessary to turn the starter over!

Unless it's some rare super E30 that has a clutch lock out or something lol. But as far as I know, that was never the case.
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Re: 24V Swap info

Postby ten2doyle102 » Thu May 28, 2015 4:46 pm

Well, I think I may have gotten it figured out last night. I will preface this post by saying that I did not start the wiring, only tried to finish what my friend started... It was late and I SHOULD have known something wasnt right...

Anyway, I think he somehow managed to start wiring the e30 plug to the AUTO TRANS portion of the s50 harness inadvertently... We were going off the AKG site wiring diagram which doesn't list colors of wires, otherwise I probably would have figured out what happened. Looking at what color wires were in the cut off portion lead me to believe they messed up.

facepalm...
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Re: 24V Swap info

Postby Yoshi » Fri May 29, 2015 10:56 am

lulz
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Re: 24V Swap info

Postby ten2doyle102 » Fri May 29, 2015 12:24 pm

Yeah.... So I rewired it correctly last night, but my friend cut off a number of required wires so I couldn't do it 100%. I think we need a new plug.

At any rate, the starter is functioning, fuel pump is fuelling, but no spark so it wouldn't start. Not sure if the missing wires are causing it though. It's just missing the diagnosis plug wire and he cut the big green wire back from the ignition harness, but there was a second smaller green wire that came out of the same pin so I just connected that to see if it would work.

More testing to be done it would seem. :(
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Re: 24V Swap info

Postby Yoshi » Fri May 29, 2015 12:56 pm

I'm assuming you're getting fuel pressure but no injectors firing. That means the ECU is getting power but not receiving a crank signal. Sometimes people mix up the ICV and CPS plugs and something else.
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Re: 24V Swap info

Postby ten2doyle102 » Fri May 29, 2015 7:56 pm

No, the injectors are firing. since when I pulled the plug to check spark a cloud of fuel mist shot out of the cylinder....

Does the CPS also control when the injectors fire?

"If you ended up with a harness out of an automatic car simply cut all of the wires out of the engine harness that belong to the automatic transmission computer. Automatic transmission computer is wired directly to the engine computer harness; the only wire that needs to be modified is a “brown/black wire pin 26 transmission ECU” need to be connected to any “red/white wire on the main relay”. " - RMEuropean

I found this on the RMEuropean website, but I am not sure what it's talking about. There's no 26pin on the Auto Trans x20 connector that I can. Or is this maybe referring to the plug that connects to the transmission ECU?
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Re: 24V Swap info

Postby Yoshi » Sat May 30, 2015 12:14 pm

You're getting out of my knowledge base. If injectors are firing, it's likely a wiring issue with the coils. Either they aren't getting power, or they aren't getting signal. That's about all I got for you.
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Re: 24V Swap info

Postby ten2doyle102 » Mon Jun 01, 2015 11:07 am

Alright.. well we will just have to keep futzing with it. Just feel bad for the guy.
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Re: 24V Swap info

Postby Yoshi » Mon Jun 01, 2015 12:07 pm

From what I can tell, it's his own fault. *shrugs* I've run out of sympathy for people that don't seem like they put enough thought into things. If you can't wire, pay someone else to do it. If you think you can, make sure you're smart.
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