Will a bad ignition coil cause a car to sputter?
Ignition misfires and "sputtering" can be caused by any number of system failures such as air/fuel, ignition and even emissions/exhaust. A failing ignition coil, control module, plug wire and plug are often components that should be examined when diagnosing such misfires.
Can a bad catalytic converter damage the ignition coils or a bad ignition coil can cause to catalytic to go bad on a ford expedition?
There could be several things to cause no spark, but one I have ran into is the Ignition Control Module inside the distributor or the coil inside is bad. If your plug wires are good and your wiring to the distributor checks out, then it's either the coil or the ignition control module. Both are inside the distributor.
No spark could be caused by several things: no voltage to the coil or ignition system; a bad coil; a bad ignition system; bad pickup coil(s) in the distributor; a bad coil wire; or more serious engine problems such as a broke camshaft or camshaft timing chain. If your distributor is fine and the coil is good as well as the ignition system is in working order, you might check the computer on the side…
As you did not say which vehicle this can only be a general answer Unlikely that a faulty coil would cause an engine to knock. Very possible it would cause bucking, if the coil is failing there would be a lack of spark. This would cause bucking/missfire, which may cause the engine to shake on it's mountings possibly causing a knock from contact with the vehicle frame.
I assume from your description of PCM code 43 that it is indicating an ignition coil problem. If the engine still runs well, clear the code and see if driving will cause the code to re-appear. If the code doesn't show up again, it may have been just an unexplained occurrance. If it does you may have an ignition coil going bad or some other problem in the area. If it says ignition coil it…