2.7 no spark

[h2700]

hi all , put this up in the wrong section b4 i think

bit of background info ,

fitted a 2.7 into a 89 320i ,the 2.7 was originally running on early motronic managment (2 row plug ) ive used the later motronic loom and a chipped 325 ecu(3 row plug ) ,early maf meter and idel control valve ,

tryed to turn it over today , but to no joy . im not getting a spark at the coil ,ive tryed a good spare and still no joy , its got the later tdc and toothed pully


any ideas ?

thanks gareth

[Brianmoooore]

It won't even turn over??

[h2700]

sorry need to update that it wouldnt turn over . now got it turning over , earth starp has given up the ghost ,so now its cranking but wont run .

[town325i]

change the crank senser that can cause problems like you have

[Brianmoooore]

The same as any M20 - if the ECU is good, it's getting power where it should, the coil is powered, and the ECU is getting a signal from the CPS, then it will produce sparks, at least at the coil.
Does the fuel pump run when cranking?

[h2700]

ok had a look today and im not getting power at the coil , put a fused feed onto the coil and the icv came alive but there wasnt any spark ,

how can i check to see if the ecu is gettingpower ?

[Brianmoooore]

If the coil isn't getting power, then the chances are that the ECU isn't being switched on either.
Coil feed (green wire) is direct from the ignition switch, through three plugs and sockets, but no fuses.
Red wire to the ECU is permanent live, same green as above is the switching supply, and red/blue should be live as well when switched on.
Does the main DME relay click when the ignition is switched on?

[h2700]

which rerlay is the dme relay ?

if its what im thinking it is no its not clicking .

[secondtimelucky]

I think i posted a possibility in your other thread mate

[h2700]

ok if what i think is the dme relay is wat ive just tested small light green 4 pin relay ? ,there is power from the 12v but its not switching , so if my logic is correct its either


the ecu is duff ,
but ive tryed swapping it so i dont think its that

the ecu isnt getting power ?

or the wire between the ecu and the dme is damaged ?

[h2700]

ok just done some more check and if pin 27 on the ecu is 12v in im not getting power to the ecu . does any body have the schematics for the later motronic loom haynes is rubbish .

[abelai]

http://www.autolib.diakom.ru/CAR/BMW/19 ... /fig02.pdf

[Brianmoooore]

If you don't get 12 volts on pin 27 (green wire), with the ignition on, you have a simple wiring fault with (probably) the car loom.
Any hidden immobilisers?

[h2700]

yay . got it starting sort of , found a dodgy wire on the fule pump relay , and theres no power on pin 27 whic i think is the imobiliser .

[h2700]

put power onto the ecu and its sort of starting now lol but not holding its idel quiet yet

[h2700]

update , still not working corectly ,but it is kind of running , it will run on the original 320 i ecu but not on the new 325 i ecu with the 2.7 chip ,