e30 m30 swap. no spark!!!

[kylelauffer]

1991 325is putting in 1989 535i m30 engine.
i first off put the m20 harness on and tried it. i had the injectors pulsating and power to both sides of the coil. but when cranking the light goes out when it is supposed to be pulsating like it does on the injectors.
and yess all sensors are in correct spots!

so now what i did is used the m30 wirering harness and i am getting the exact same problem. i got fuel with both harnesses.

so power to both sides coil when key turned. when cranking signal light goes out on smaller wire of coil. oposite wire of terminal 15.

possible solutions??? i followed a wirering diagram and what stumped me was the ignition control module??

im 18 years old so if you think its something simple then it just might be that??

any input? thanks alot guys

[drift]

Ground.
Relays.

[kylelauffer]

those ground wires have 11-12 volts to them? any ideas.

[kylelauffer]

hooked them up to grounds and still no spark. still get 12 volts out of them.

[weaksauce]

hooked them up to grounds and still no spark. still get 12 volts out of them.

if you are getting 12 volt on your grounds you're doing it wrong.

[kylelauffer]

okay well tell me what im doing wrong? everything is hooked up the way it was on the 5 series. i color coded all the wires with zip ties to not mix any up.

[kylelauffer]

the grounds are grounded. relay grounds also. now they are not live anymore. but stiill now no spark or fuel

[weaksauce]

it's hard to say without seeing it.

IS it cranking over?

I still think it is a ground. Do you have a ground strap from the motor block to the frame of the car?

[kylelauffer]

yes i do have a ground from motor to frame. and yes the car is cranking from the ignition just like normal. the car was an auto. i converted to manual. so i have auto thing plugged in so it satisfys the neutral safety switch. could it be the fuse box wires that connect with the m30 harness? because i couldnt imagine it would be just plug in? the 5 series had so much more computer in it. so i think im lacking some stuff. control module?? do i need to take that off the 5 series and convert?

[RickSloan]

are you in new castle delaware?

sounds like your cps and spark sensor are switched, its really common and gives your symptoms, i do it al the time. try switching those, they are on the front of the harness by the thermostat.

i know you said your connections are right but this is a def possibility

[kylelauffer]

yes that is common to do i know. i color coded the wires and all. and still tried to switch them and see what happened. and still nothing. no spark or fuel...wat combination did you do and did it take and modifications?

and newcastle washington

[george graves]

Try by-passing your main relay?

Is the fuel pump running when you are cranking?

What testes *have* you done?
What's your battery voltage?

I'm too busy to type out 1000 questions - you are going to have to give us more info to go off of.

[Jean]

could it be the fuse box wires that connect with the m30 harness? because i couldnt imagine it would be just plug in? the 5 series had so much more computer in it. so i think im lacking some stuff. control module?? do i need to take that off the 5 series and convert?

could be anything. you need to provide us details. what harness are you using, what have you done with wiring, is your fuel pump working, have you tried another relay? have you checked your cps, where is it plugged in?

The 5 and 7 series have only ONE DME for the engine...the other stuff is if you pulled the harness from it you would know is not engine related.

[kylelauffer]

with the m20 harness i was getting fuel when cranking but no spark. so i took out m20 harness and now using m30 harness and computer like i said. everything plugged in grounds all hooked up. no spark or fuel now. iv tried swaping cps but no go. so hooked it back up in correct place.

[Jean]

What year/model did the m30 harness came out of?
Is this a motronic 1.3 (b35)?
What DME are you using? 179? Is it a known good dme?
Used or new CPS? Did you check it with ohm meter?
Used or new temp sensor? Have you tested it? Is it hooked up correctly?
Have you tried another set of relays? (if you were getting fuel with m20 harness, sounds like your pump was working).
Is the pump working now or not?
Have you tried jumping the pump?
Are the fuel in / out lines hooked up correctly?
Is it cranking or not?
How good is your battery?

^ for starters.