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Old 11-05-2009, 18:06   #1 (permalink)
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Escort electrical, COIL!!

Hi

I have an Escort that has been burning coils all Summer.. changed the usual suspects.. wires, plugs(twice), even the PCM.. looked for continuity to ground in the two ground legs in the coil harness.. seemed ok. I DO have stray voltage in my room fuse circuit. I remove the fuse and it goes away. The PCM is on the circut as well.. disconnecting the PCM does not remove it..(thought it might draw a bit till it went into sleep mode).. checked cig lighter.. dome light.. what else is on that circut? My wiring diagram shows the room fuse hot at all times, but does not show what in on the circut.. other than the PCM. Could this ground out cause the coil to burn out? I found one article that said this was posible.
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Old 11-05-2009, 18:25   #2 (permalink)
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Re: Escort electrical, COIL!!

What year is the car? What model and engine?
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Old 11-05-2009, 21:52   #3 (permalink)
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Re: Escort electrical, COIL!!

Hi

Yea, I guess that would help. It is a 1997 escort with the 2.0.

It's been an odd one.. it runs like a top with a new coil.. then one morning it drops to two cylinders// always 2, and three. 1, and 4 is the side that burns out every time(6 times.. three new coils, 3 junk yeard coils).. that led me to looking at the wires between the coil and the PCM... there are no shorts in the wires. I did have a pin in the harness with poor connection(I changed this too... but to a junk yard harness).. so I may just get a new harness to make sure that is not my issue. The "short" in the room fuse circuit I cannot find. And I read a piece about an electrical short, that bleeds into the coil circuit can burn coils. It doesn't seem to be a huge drain. I left it hooked up two days and it drew the battery down to 11.75.. still enough to turn it over.

I also followed the negative grounds back and cleaned each. I found the one by the starter, and removed the bracket, and the connection, and used emmory cloth on both..they looked a bit corroded, but not horrible.

thanks for looking.....
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Old 11-06-2009, 09:22   #4 (permalink)
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Re: Escort electrical, COIL!!

When you remove fuse 5, the draw goes away? That fuse runs the chime module, trunk light, PCM, shift lock actuator, dome lights, map lights, radio memory, amplifier, left door lock switch, key in ign. switch, and ignition switch light. As far as the coils, that draw shouldn't affect the coil. Have you checked to see if the coil stays hot with the key off?
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Old 11-07-2009, 11:41   #5 (permalink)
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Re: Escort electrical, COIL!!

Hey.. thanks for the reply.

I checked to see if I had power at the harness with the key off.. and there is a little, yes.. that goes away when the PCM is removed(as does the continuity to ground on the two outside pins.. to 52, and 26 on the PCM). Also interesting to me is that in the harness I have continuity to ground on the two ground leads.. to pins 26, and 52. My understanding is that the PCM grounds these two, one at a time???.. I don't completely understand how the PCM is running the coil.. but seems odd both would be grounded at the same time... but it runs like a top.. so I dunno. It just burns the coil eventually.. with a junkyard coil it burns it almost immediatly...new NAPA coil WAS lasting 1500 miles.. it is always on start up.. and on cylinders 1 and 4..

thanks for your interest!
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Old 11-07-2009, 12:41   #6 (permalink)
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Re: Escort electrical, COIL!!

Here's a wiring diagram for the circuit. There shouldn't be power to the coil with everything plugged in unless the ket is on.
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Old 11-07-2009, 15:52   #7 (permalink)
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Re: Escort electrical, COIL!!

thanks..

For some reason now there is no juice to the coil with the key off.. odd.

I removed the room fuse, and it seems to run fine without it.. I wonder what part of the PCM it powers?

As I look at that diagram you posted I realize the coil is all that is run by the engine fuse? When all these problems started I could not get the car started... and traced it to a blown engine fuse. I replaced it, as well as what I thought was a fuel pump that was dragging, and it ran fine for a month or so.

I cleaned the leads on the coil, and soaked the harness in electrical cleaner, and put it back together with dialectic gel..

It's running, (I am running it without the room fuse connected).. seems to be running fine, but it used to do that before.. and still burnt coils.

How about the voltage at the coil never dropping out of start mode?.. Doesn't it drop to 9 volts once running for a while?
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Old 11-07-2009, 16:43   #8 (permalink)
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Re: Escort electrical, COIL!!

If you look at the diagram, you'll see that the coil has power from the fuse and that means it's 12v all the time. The older cars did drop the voltage but these don't. I wonder if your alternator is over charging the system?
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Old 11-07-2009, 17:10   #9 (permalink)
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Re: Escort electrical, COIL!!

Quote:
Originally Posted by rtg143 View Post
If you look at the diagram, you'll see that the coil has power from the fuse and that means it's 12v all the time. The older cars did drop the voltage but these don't. I wonder if your alternator is over charging the system?
I'm not very good with electrical issues, but could a bad voltage regulator be the problem?
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Old 11-07-2009, 17:20   #10 (permalink)
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Re: Escort electrical, COIL!!

Check the voltage with the engine warmed up and running. It shouldn't be over around 14.2 volts. If it is, the alternator will need to be checked. There could be a bad connection and the alternator tries to charge to that amount and it senses a lower amount. In other words the circuit has to be checed to see why it doesn't know the circuit is that high.
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