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1997 4.0 Disco I loose the coil trigger output on 2 coils , I am thinking bad ecm also , starts up runs great then the 2 trigger signal s go away , this is the Gems also , I got a ecm from eBay same problem , do I need to have the ECM flashed, ? Please help if you can

Their is a independent shop that has software to connect it's going their

New wire from ECM to coils

Same problem with the coil trigger disconnect, new coils, switch the coils that are working with the ones that's not same problem, very strange issue ,

No luck same problem

Yep I will run a new wire from ecm output trigger that is failing and see what happens THANKS

I am loosing the coil trigger on 2 coils again

I am loosing the coil trigger on 2 coils again

I have tested all my signal s with a oscilloscope they are all their and strong signals Any help on this would be Great

Ok this is the deal, my son has worked at Land Rover in sales for 8 years, The service department informed me that my 1997 Land Rover discovery Ecm that I replaced does not have to be flashed / reprogrammed . When I replace my Ecm it was because I would loose the trigger signal on 2 coils only ...

No luck ,

Found a bad solder joint on my ecm re solder and give it a try, its going to my output haven traced it to confirm out put to coil trigger

From what I understand the crank sensor is the only input signal that effect s the coil trigger and the camshaft sensor triggers the injectors which are working fine , it runs great on a start up firing on all 8 cylinders then loses the coil trigger on 2 coils then is running on 4 cylinders...

The Ecm I replace , I have always had the same issue, with both, I will test my trigger signal with it disconnected from a coil with my oscilloscope and see if their is a current load problem and and also scope my crank sensor and see if I am losing a pulse

I have the same problem no one knows a answer yet , 1997 Land Rover discovery 4.0 , disco starts 1st time runs great then all at once it looses the coil trigger signal to 2 coils , then is running on 4 cylinders and running like crap , new crank sensor new ecm same as all ways coil trigger goes away

Good thought Mark , haven't tried to disconnect 1 of the 2 while it's running and read the signal , try it tomorrow

Yep got new ones , same problem