Author Topic: swaped m10 to m42 (Read 3764 times)

E30_3I8I · « **on:** February 07, 2010, 12:29:23 PM »

hey everyone my name is paul.. i have a 84' 318i. ive swaped my dead motor with a rebuilt m42 that was bored out to a 2.0 and cams etc. ive hooked everything up and i get in the car to start it up for the first time... the gauge lights are lit, that annoying sound when the door is open comes on and the car doesnt start:mad::mad::mad::mad:

ive bought the adapter that should be plug and play for me.. but the car doesnt turn on. i cant hear the fuel pump work either? i need helppppppp plzzzz i wanna finally drive my project carrrr

E30_3I8I · « **Reply #1 on:** February 07, 2010, 01:01:42 PM »

Can anyone help me out???

flyinglizard · « **Reply #2 on:** February 11, 2010, 08:23:41 AM »

What injection/ignition, system are you using? The 91 uses the crank signel to fire the fuel relay.(grounding it , I think)
The 84 uses a dist rpm signal to ground the relay. Both fire the controller, and the controller grounds the relay
Both need a rotation signal of some sort to maintain the fuel relay ground.
The rest of the controls have been engine specific. I dont see why the 84 system wont work on the 91 engine. But you have to use some sort of crank fired ignition system. Maybe there is a front cover that can fit a dist into the cam, for a dist. .. IDK. MM

E30_3I8I · « **Reply #3 on:** February 11, 2010, 09:36:27 AM »

i found some of the problems for it. I connected three of the green wires that engages the neutral safety switch.. the motor turns out.. but doesnt start... so i bypassed the fuel relay and it was working. when i put the relay back in. it wasnt working.. so i guess i need a new relay?right

e30guydownunder · « **Reply #4 on:** February 11, 2010, 08:47:10 PM »

If the ECU isn't getting power the fuel pump won't turn on. You will want to get an early 318i wiring diagram and a late model e30 one (a 318iS would be best) compare and work out what has to be spliced where.

Click here

E30_3I8I · « **Reply #5 on:** February 11, 2010, 10:23:20 PM »

i have an adapter.... now my car doesnt have spark=[

rob_e30 · « **Reply #6 on:** February 12, 2010, 09:59:26 AM »

What ECU are you running? Did you take the entire M42 wire harness and ECU? It won't fire the ignition if it does not see the crank position sensor.

E30_3I8I · « **Reply #7 on:** February 12, 2010, 11:44:27 AM »

i got basicall everything for the m42 motor , harness, driveshaft,ecu,afm, mostly everything and extra..... i believe the cps and cms has gone...

1 of the sensor reads .608 the other is 1.260 on the multi meter

E30_3I8I · « **Reply #8 on:** February 12, 2010, 11:46:04 AM »

i also bent the chip on my ecu... (my stupidity)=[[

Im leaning toward the markd chip.. but im also going to get a ecu from the junk yard... and probably both the sensors for the junkyard aswell to finish up my project