chillydk147 Posted August 19, 2014 Share Posted August 19, 2014 Hi Guys, this is my first post, my Mondeo is only firing on spark plugs 1 and 4, 2 and 3 are not firing, I originally changed all spark plugs but this made no difference, next I tried changing the coil, again no luck, next I checked the cabling going into the coil and all the way back to ECU, it's functioning fine, finally I brought it to two different non-ford mechanics and got them to do a diagnostic test on it, both tests indicated a fault with the coil, now I already changed the coil for a brand new one, I'm thinking at this point that the ECU may be at fault, I'm thinking that the ECU is failing to send any signal for plugs 2 and 3 and is somehow interpreting this as being a problem with the coil. Any ideas or suggestions would be great. Quote Link to comment Share on other sites More sharing options...
BOF Posted August 19, 2014 Share Posted August 19, 2014 If you swap the coil packs around, does the fault move with the coil pack, or not? Quote Link to comment Share on other sites More sharing options...
chillydk147 Posted August 19, 2014 Author Share Posted August 19, 2014 Hi, yes I tried swapping the leads around to make 2 and 3 fire, and they did indeed fire, so this must rule out the coil as the fault. Quote Link to comment Share on other sites More sharing options...
Blackie_No1 Posted August 20, 2014 Share Posted August 20, 2014 I'll be watching this thread, my mk2 2.0 has a very weak spark on the no3 cylinder & I've changed the coil pack and still the same problem. Previous owner put new plugs and leads in it as well. Sent from my iPhone using Ford OC Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted September 1, 2014 Share Posted September 1, 2014 if the spark follows the plug then its probably leads. If you change the leads / coils over from 1 and 4 to 2 and 3, does the fault follow? if so then change just one (the coil rather than the lead) and see if the fault follows the coil or the lead. This is how you will determine which is at fault, its a process of eliminiation. Quote Link to comment Share on other sites More sharing options...
chillydk147 Posted September 1, 2014 Author Share Posted September 1, 2014 Hello, this issue has since been solved, turns out the problem was a faulty module within the ECU which is responsible for sending a signal to 2 spark plugs, bought another ECU and had a mechanic who's also adept with electronics swap a good module from the purchased ECU to the current ECU, result was the problem fixed and no need for programming or coding keys as only a module was changed. 1 Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted September 1, 2014 Share Posted September 1, 2014 What was the total cost in the end? Quote Link to comment Share on other sites More sharing options...
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