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Re: no fire to coil
Do you mean no spark from coil? If so, check crank sensor, distributor pickup (also refered to as cam sensor) and ignition control module (if you have one it is located next to coil). Most common of these is failure of crank sensor. BUT, check before replacing. 'Won't hurt to buy a manual to guide you through testing!
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Make sure the coil is getting power. Then you would need to check the crankshaft sensor for continuity after unplugging it. If the coil is getting power and the crankshaft sensor is tested good, then the brain box must be dropping the signals.
No fire (spark) from the coil? Check for a 12 volt power signal to the coil with key on, and test the coil, or swap in a known good coil. If no help, find and test the ignition control module, or ignitor as it is called on Japanese models.
on the straight six you will remove the bolt holding each coil to the valve cover. Remove one coil and use either a spark tester or a test light. If there is spark the coil is good. If there is no spark swap that coil with another. If the swapped coil fires than you know the circuit is good. If the coil that didn't fire still doesn't fire than you know the coil is bad.
Check the spark plug first. then if the plug is good you wil need a digital ohm meter to test the coil pack. if you need to know how to remove the coil pack let me know, to test put on ohms should not have more than 2 1/2 ohms restance betweent coil lead to coil connector. If you test the coil pack on both sides of the pack and get a reading then the coil is bad, if it does not read then you haave a bad fireing plate diode.
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.