After some help, we are stuck with my new engine.
It came out of a running car and has gone into mine, but unfortunately none of the leads/packs are marked for what cylinder they are. and all leads are the same length.
Can anyone think of any way of finding the firing order?
We have tried turning it over by hand with plugs plugged into the leads and earthed out, but it's not sparking at such low RPM

The packs in question.............

We have had it running on 2 cylinders so far, but thats as far as we can get.

Any help would be amazing!

 

if its wasted spark ,then it will batch fire,

so leads 1 and 4 on one coil,

2 and 3 on the other.

the lead order on each coil won't matter, because if its wasted spark its just two single coils, meaning 1 coil will fire both of its cylinders at the same time.

 

Thanks for the reply James, forgot to say, its not on wasted spark set up!

 

so each of the coils has two signals? and can fire one lead induvidually?

 

It must have, Plugs definatly firing individually

 

if thats the case you just need a wiring pin out, and pick out the signals which will reference to which cylinder they fire.

 

are you sure its not wasted spark?

how many feed wires does each coil have?

if its 2,just a live and a trigger, then it is just a simple wasted spark system, 1 and 4 on one coil, 2 and 3 on the other.

 

Is this SM2 ecu

 

You need to chat to Rod/Mark

 

we have tried is in that configuration, but still to no sucsess. Definatly all 4 leads are sparking but engine will barely run on 2 cylinders and plenty of backfiring. Typical incorrect firing order. I believe its on SM4 ECU

 

Nah !!
Thats too easy mate.

We know nothing ive only sorted the wiring on more Autronic ECU's than any other human being .

Dont worry James we will get to hear about whats driving them coil im sure. Dont worry it will be batch fireing wasted spark im sure.

 

Felt cheeky PMing Rod or Mark to ask!
But yes, it is SM2, Rod.

 

I'd have just phoned you at home Rod not on Christmas or boxing day though, obviously

Wong, PM Rod, he's always there to help and knows more than most about Autronic! I suspected yours was SM2 wasted spark, as my SM4 setup has one coil per cylinder - so assuming that's sequential Rod?

 

I've given him a pm, hopefully he can help!
Fingers crossed!

 

You Sure it just aint had a cold start map done?
Seen a couple of cars like that, seemed like they misfire etc cos the cold start wasnt mapped..
But as said, how many wires are actually going to the coil packs? 2 or 3 to each?

 

I would of said 1 coil pack is 1n4 and the other 2n3

 

Sounds like a wiring problem, or a sensor problem to me. Have you got a laptop and comma cable for the ECU? You can download the software from Autronic's website and see if there are any error codes

 

PM answered.