First coil quit fireing on 2 cylenders replaced coil ran two days so replaced coil now no fire out of new coil all three wires have at plugin have power when starting but still no fire to plugs
Crank sensor if it has one,timing belt skipped is a possibility,and always the dread security key problem.don-ohio
SOURCE: 94 ford escort no fire
Hi there!
You've done the most obvious, and we're still in the process of elimination -
You said -"no fire" so that's completely dead - not even a missfire?
The problem should be at the coil, or 12V side of things.
The coils usually fail at high voltage, - so test OK with a meter, just break down in use as the insulation is defective.
I had a car that was stripped of everything - and it ended up being a defective coil - which is what I suggested in the first place.
Make sure you are getting 12V to the coil with the ignition ON.
If possible test the coil by using the HV output directly to a spark plug (one of the old ones) - then ground the other terminal.
(make sure you have both contacts) You should get a spark when turning ignition on and off.
Any noise from the coil during testing will indicate a fault also.
Check battery condition and clean contacts as a precaution.
Don't shock yourself! - take safety precautions against this.
SOURCE: 1997 Ford Explorer AWD 5.0 v8
you might want to replae the map sensor and or the egr valve either of them can make it backfire
SOURCE: no,4 plug not fireing changed plug wires.new coil.plug ran good for 100 miles then 4 stop again
You would need to figure out if it is a problem inside the cylinder or with something like the crank-cam sensor firing the coil. I would change the plug again to see if it works for a few days.
Could be a problem with the fuel injector or a vac leak if the plug is firing but no power from that cylinder.
SOURCE: 86 ford bronco 2 no fire to the coil wires that plug into the coil so no fire
This is either a wiring loom issue or a ECU issue.
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