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M52 swap turning over, power to coils but still not starting
Posted: Mon Jul 17, 2017 8:22 pm
by johnmaccow
I've got 12v to my coils, ews delete and remap from Dan and it's turning over but not firing.
I have power to relays but pump not priming but does if you jump the connection , got a good cps from Mick after buying a cheap crap one and an unknown one off ebay so know it's good.
Anyone know what I should be looking at and testing?
I'm off for 2 weeks from this weekend so determined to get it to fire.
Re: M52 swap turning over, power to coils but still not star
Posted: Mon Jul 17, 2017 9:46 pm
by Brianmoooore
Engine loom negative lead connected properly?
Re: M52 swap turning over, power to coils but still not star
Posted: Mon Jul 17, 2017 9:51 pm
by johnmaccow
I think so, brown and orange mate?
I'm going to strip all the unused wires and check it all thoroughly when I bring it down, wish I had sent it to Dan with my ECU to know it was 100%.
Re: M52 swap turning over, power to coils but still not star
Posted: Mon Jul 17, 2017 9:56 pm
by Brianmoooore
Brown and orange is loom negative, and if you have power at the relays, the battery positive must be correct also.
12 volts at the coils means the ignition switched live must be reaching the loom correctly as well.
Do you know if you have sparks at the plugs, and if you hot wire the fuel pump, do the plugs get wet with fuel after the engine has been cranked?
Re: M52 swap turning over, power to coils but still not star
Posted: Mon Jul 17, 2017 11:16 pm
by johnmaccow
Il check first chance I get mate, thanks for taking the time to help me

Re: M52 swap turning over, power to coils but still not star
Posted: Sat Jul 22, 2017 3:54 pm
by johnmaccow
Plugs not wet or firing mate, good earth to brown and orange ecu earth.
Bringing it to the house Monday so I can drink coffee while it annoys the fk out of me.
Re: M52 swap turning over, power to coils but still not star
Posted: Sat Jul 22, 2017 7:45 pm
by johnmaccow
Just found an old post you were commenting on from May mate, mentioning the medium and thin green wires. I'm going to use that to check the power and earths etc on my loom. Pretty sure its just a thin green ive got wired into the plug.
Re: M52 swap turning over, power to coils but still not star
Posted: Sat Jul 22, 2017 8:15 pm
by Brianmoooore
The plain green ignition feed to the engine loom goes to the ECU (pin 49) , to switch it on, and to + terminals of the ignition coils.
The easiest way to check if the ECU is switched on is to pull out the DME relay with the ignition on. The relay should click when you pull it out, and again when you push it back in.
Re: M52 swap turning over, power to coils but still not star
Posted: Sat Jul 22, 2017 9:43 pm
by johnmaccow
Thanks mate.
Re: M52 swap turning over, power to coils but still not star
Posted: Sun Jul 23, 2017 10:18 am
by DanThe
You should have a thick green and a thin green connected to Pin 7 on the C101, thin green goes to ECU, thick green goes to coils
Re: M52 swap turning over, power to coils but still not star
Posted: Sun Jul 23, 2017 6:08 pm
by johnmaccow
Thanks Dan

Re: M52 swap turning over, power to coils but still not star
Posted: Mon Jul 24, 2017 6:51 pm
by johnmaccow
Found 2 thin green wires for ECU not connected, attached them and it fires

No manifolds on at no so knocked it off fairly quick but it lives!!
Thanks so much Dan and Brian, after 6 years I may actually finish this.