Coil tests~ what does this mean?
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Coil tests~ what does this mean?
When I first start my '83, F150 351w duraspark ignition pickup, both sides of the coil are real hot when you turn the key on. After it dies,(and it does once warmed up) the battery side of the coil barely lights the test lite, and the other side of the coil is dead. This is the third coil we have tried, and all three have the same results!!!! What does this mean? I am completely baffled now....!
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A 12v test light isn't very good for what you're troubleshooting. The correct voltage on the BAT terminal on the coil with the ignition switch in 'run' is between 5-8 volts. 5 volts is what mine runs at. So of course 5 volts won't illuminate a 12 volt bulb very well. Get yourself a digital multi-meter to check that with. You can also use it as an ohm meter to check the resistance of the coil. Coil resistance should be 7,700-9,600 ohms.
You can also use the multi-meter to check the resistance on the Crankshaft Position Sensor. Have you checked that yet? I gave you the spec's for that and the procedure in your other thread. Test it both before you start it and after it quits. If it tests 'open circuit' it's not going to fire.
BTW, because EEC-III/Dura Spark III is so uncommon, it would be wise to mention that in every post.
You can also use the multi-meter to check the resistance on the Crankshaft Position Sensor. Have you checked that yet? I gave you the spec's for that and the procedure in your other thread. Test it both before you start it and after it quits. If it tests 'open circuit' it's not going to fire.
BTW, because EEC-III/Dura Spark III is so uncommon, it would be wise to mention that in every post.
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Thankyou again.
Thanks again, and I will try to remember about mentionning the whole durasparkIII....I was in a rush, and didnt do it. I also was unaware that it was not all that common. Shesalonewolf aka Deb
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DurasparkIII is that the one with the altitude sensor input (Yellow Gromit)? If so, I am sure the wiring is basically the same as a DSII you only have a seperate connection to the module for a sensor - all other wiring to power & distributor is the same.
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Thanks for adding that for me. And I wont forget to be sure and state its a durasparkIII ingnition.
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Oscar Meier, yes, Dura Spark III has a barometric pressure sensor (BMAP). It's one of the electronic sensors that give information to the computer. The DS-III module has a brown grommet and six wires instead of five. DS-III uses the same coil as DS-II, but that's about all.
The DS-III distrubutor has no magnetic pickup inside. It uses a Crankshaft Position Sensor instead. There is nothing inside the distributor except the rotor! The rotor has electrodes on both sides and fires from each side alternately, 180*. There is no mechanical or vacuum advance on the distributor. All spark advance is determined by the computer. It can advance the timing up to 50* BTDC.
Dura Spark-III is the middle child. It doesn't share much in common with TFI Dura Spark-IV either.
The DS-III distrubutor has no magnetic pickup inside. It uses a Crankshaft Position Sensor instead. There is nothing inside the distributor except the rotor! The rotor has electrodes on both sides and fires from each side alternately, 180*. There is no mechanical or vacuum advance on the distributor. All spark advance is determined by the computer. It can advance the timing up to 50* BTDC.
Dura Spark-III is the middle child. It doesn't share much in common with TFI Dura Spark-IV either.
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