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Old 05-14-2015, 05:15 PM   #1
camcraft
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Question M42 Engine wiring issues

Ok guys this is my first post as i have been able to find most of what i have needed in the past here without asking for help however in this case i really need some direction. I bought a 1995 318ti that was non-running (its my hobby to build these m44 m42 engines out and make them run, i have a z3 1996 that i have rebuilt from the ground up with minimal issues doing so thus far) the issues i am having is the engine wiring harness on the M42 this is slightly different from the M44 and i do not have a visual reference to which plug goes to which connector/sensor on the engine, on the m44 there is little room for error as the wiring harness has a quick disconnect at the air intake manifold and thus is easily reconnected and disconnected when removing the air intake manifold, unfortunately the wiring harness was disconnected at the time i claimed this car and i have no way of knowing what lead goes where. That being said i have identified the 4 connectors and how they plug to the wiring harness for the cam & and knock sensors in the proper locations however there are several i do not have a way of identifying the following connectors are on the engine but how do i ID the proper connector on the wiring harness for that sensor ? there is an oil sensor under the oil filter, an air intake control plug a throttle body control plug and 2 sensors located on the head under the air intake manifold i believe one is a temp sensor. any visual reference of the wiring harness with plug listings would be great.
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Old 05-15-2015, 06:10 AM   #2
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Quote:
Originally Posted by camcraft View Post
Ok guys this is my first post as i have been able to find most of what i have needed in the past here without asking for help however in this case i really need some direction. I bought a 1995 318ti that was non-running (its my hobby to build these m44 m42 engines out and make them run, i have a z3 1996 that i have rebuilt from the ground up with minimal issues doing so thus far) the issues i am having is the engine wiring harness on the M42 this is slightly different from the M44 and i do not have a visual reference to which plug goes to which connector/sensor on the engine, on the m44 there is little room for error as the wiring harness has a quick disconnect at the air intake manifold and thus is easily reconnected and disconnected when removing the air intake manifold, unfortunately the wiring harness was disconnected at the time i claimed this car and i have no way of knowing what lead goes where. That being said i have identified the 4 connectors and how they plug to the wiring harness for the cam & and knock sensors in the proper locations however there are several i do not have a way of identifying the following connectors are on the engine but how do i ID the proper connector on the wiring harness for that sensor ? there is an oil sensor under the oil filter, an air intake control plug a throttle body control plug and 2 sensors located on the head under the air intake manifold i believe one is a temp sensor. any visual reference of the wiring harness with plug listings would be great.
Suggest taking a few pics of the connectors in question and posting. I'll cross check them on my 95 M42.
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Other Current Bimmers: 2000 2.3L Z3 / 1997 1.9L Z3 / 1991 318ic / 1999 540it

1997 318ti Sport - "Huera" - RIP
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Old 05-15-2015, 02:45 PM   #3
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in the image above the connectors in question are the ones coming of the assembly under 5/6
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Old 05-15-2015, 03:48 PM   #4
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Took a quick look at a M42 I have on a stand, uncaffinated and just before getting ready for work.




Nothing definitive at this point, I need to untiewrap the harness to get a better view. I'll need to do that tonight after work. Prolly easier to trace the harness on this motor than crawling under Wifie's 95. Config of the harness on this one might look a little different due to the DASC, but the connections should still be there nonetheless.

This M42 harness doesn't have the lower junction box on it. It was all separated by the PO when the DASC was installed for a little more room and installation ease.

A couple of guesses out of that junction. Air temp to airbox. AFM, TPS, 2 knock sensors, CPS.
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1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top
1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior
1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior

Other Current Bimmers: 2000 2.3L Z3 / 1997 1.9L Z3 / 1991 318ic / 1999 540it

1997 318ti Sport - "Huera" - RIP
1995 318ti Active - RIP
1995 318ti Sport - "Tiny" Sold
1994 325i Sedan - "Jade" - Sold
1985 635csi sold
1984 533i "Max" Sold
1984 318i sold

BMWCCA #160411

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Last edited by BlackBMWs; 05-15-2015 at 04:37 PM.
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Old 05-15-2015, 05:38 PM   #5
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Wonderful! At least I have some references, I will take pics tonight of the actual connectors with markers so that we can get a map then I'll put a post up of the final solution once we get the mess figured out, thank you so much for the help
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Old 05-15-2015, 05:54 PM   #6
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Ok here are more visual references to my issue to make it more clear.


what plugs go to these sensors & how to identify the proper connector from the wiring harness ?


next is this

plug definitions


and the last misunderstood plug is this

which plug from the wiring harness goes to the DISA solenoid


see if that gets you a little more context to work against.
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Old 05-15-2015, 05:57 PM   #7
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Since you mentioned it how do you like the DASC ?
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Old 05-15-2015, 06:27 PM   #8
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Default M42 Engine wiring issues

First, I believe the connectors are uniquely keyed, so they should only plug in where the are supposed to go. Check that the rubber seal is still in each harness connector or socket as they sometimes fall out. Water restiance.

As far as the DASC, I suppose I should get one of the two actually installed to give good feedback. I've been focused on getting the target car, my M44 98' Cali solidified first before I put in that SC.

For the M42, I'm just waiting for my Wife to toast her current M42 as a reason to do the M42/DASC swap. It is built and ready to be installed. Unfortunately, I have got that legacy M42 running pretty solid, so it might be awhile. I have a 318ic I have wondered if it should go there. That would raise the fun factor for the Vert.

Too many car and boat projects to get to either mod so quickly.


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1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top
1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior
1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior

Other Current Bimmers: 2000 2.3L Z3 / 1997 1.9L Z3 / 1991 318ic / 1999 540it

1997 318ti Sport - "Huera" - RIP
1995 318ti Active - RIP
1995 318ti Sport - "Tiny" Sold
1994 325i Sedan - "Jade" - Sold
1985 635csi sold
1984 533i "Max" Sold
1984 318i sold

BMWCCA #160411

SUPPORT 318ti.org! CLICK THE LINK ABOVE!
Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW!

Last edited by BlackBMWs; 05-15-2015 at 06:29 PM.
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Old 05-15-2015, 07:21 PM   #9
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yeah ill be able to verify the plugs later tonight when i get to the house.
thanks for all the help.
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Old 06-01-2015, 08:36 PM   #10
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ok for anyone who has this problem i found a diagram



1 Switch-over valve for DISA (differentiated suction unit)
2 Switch for reversing lights
3 Starter, terminal 50 (M 6)
4 Starter, terminal 30h (M 5)
5 Starter, terminal 30 (M 8)
6 Alternator D +
7 Alternator B +
8 Remote thermometer sensor
9 DME coolant-temperature sensor
10 Oil-pressure switch
11 Camshaft sensor
12 Crankshaft senso
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