procharger Posted May 7, 2016 Report Share Posted May 7, 2016 Went back to plane today and switched the plugs on Ign. coils on modules and now it's firing on bottom number 3 and 4 but after changing those two plugs only, the top on 3 and 4 now are not firing, any suggestions on what's going on? I did not change the plugs on the modules that go behind flywheel to trigger coils? Link to comment Share on other sites More sharing options...
Anticept Posted May 8, 2016 Report Share Posted May 8, 2016 There is no consistency there, the top plugs are controlled by a completely separate coil and module B. Did you check the connector wires? Link to comment Share on other sites More sharing options...
procharger Posted May 8, 2016 Author Report Share Posted May 8, 2016 No will check Monday thanks. Link to comment Share on other sites More sharing options...
Tom Baker Posted May 8, 2016 Report Share Posted May 8, 2016 From what you describe you have one module that is not send a signal to the #3/4 coil. The problem could be the module, the plug, or wires coming out of the module. Look at the module plugs and make sure a pin or socket has not been pushed out of place. Another quick check would be to put on one of your old modules, and start the engine and do a quick ignition check. Make sure to disconnect the soft start wire. I would unhook it from its power source if it was me. I had a customers airplane get a piece of rubber debris in the carb that blocked the fuel off to one side. The engine ran so rough that it severed the wires on a brand new ignition modules. We re-installed one of the old modules to get the airplane back in the air. Link to comment Share on other sites More sharing options...
procharger Posted May 8, 2016 Author Report Share Posted May 8, 2016 I tried both modules on one side and both fired the same 4 plugs, so I guess modules are ok. thanks Link to comment Share on other sites More sharing options...
Roger Lee Posted May 8, 2016 Report Share Posted May 8, 2016 This can't be a module issue. It has to be a wire issue. Link to comment Share on other sites More sharing options...
procharger Posted May 9, 2016 Author Report Share Posted May 9, 2016 Can't find problem,checked all the wires in connectors, pulled each one out, checked all trigger coils with meter, checked all wires from connectors to trigger coils, switched back to old modules still same problem, either 3&4 on bottom or 3&4 on top depending on which way I connect modules, can't get all 4 plugs to fire. Checked red wires to modules they are good to. We even put meter on each trigger coil wire in plugs to see if we are getting some voltage and they all seem to be sending voltage to modules when cranking engine. Rechecked gaps on coils to .012 to get them a little closer with no change. Link to comment Share on other sites More sharing options...
Anticept Posted May 9, 2016 Report Share Posted May 9, 2016 How are the coil wires holding up?Are any wires in the ignition being shorted to ground? Check for continuity or foreign debris shorting them.Finally, let's assume that the modules or leads are not wired in accordance with the manuals. The only way to figure that out is to retrace the wires and make sure the correct plugs are going to the correct coils and the coils are connected to the correct connectors, etc. A miswire will completely skew troubleshooting. Link to comment Share on other sites More sharing options...
Roger Lee Posted May 10, 2016 Report Share Posted May 10, 2016 Start here. Read the Installation manual section 24-00-00 about modules, coils and plugs.. Look at page 10 too. Module "A" on top controls plugs 1-2 top and 3-4 bottom. Your problem lies there. The module power out to the coil isn't working. Target those wires at the 6 pin connector. You may have a pin that has backed out or a broken wire inside. Link to comment Share on other sites More sharing options...
Anticept Posted May 10, 2016 Report Share Posted May 10, 2016 Or the water seal was broken and the pins have corrosion. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted May 10, 2016 Report Share Posted May 10, 2016 Does somebody have a link to the plug wires we use on our engines? I'd like to buy some to keep on hand for this kind of issue. Link to comment Share on other sites More sharing options...
Roger Lee Posted May 10, 2016 Report Share Posted May 10, 2016 Nothing special about our plug wires. They can be had at any automotive store. Never use carbon fiber wires. Metal stranded wire only. This is the most common. They rarely go bad and almost always go to TBO unless you are hard on them and radically bend them all the time. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted May 10, 2016 Report Share Posted May 10, 2016 Nothing special about our plug wires. They can be had at any automotive store. Never use carbon fiber wires. Metal stranded wire only. This is the most common. They rarely go bad and almost always go to TBO unless you are hard on them and radically bend them all the time. Ah, so there are not NGK specific wires, or a particular brand we need to use? Any stranded wire that will fit (obviously quality wires and not Chinese junk)? Link to comment Share on other sites More sharing options...
Roger Lee Posted May 10, 2016 Report Share Posted May 10, 2016 yes and no Chinese. The spark plug wires screw onto a threaded barb on both the spark boot and the coil. Nothing hard or magical here. Link to comment Share on other sites More sharing options...
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