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Old 08-05-2011, 07:32 PM  
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No Spark, 2 & 3 cylinders, new coil pack. SVT help please

OK, here is the history of my problem:
2003 SVT Focus, 85k mi.
CEL comes on a few days ago, car runs fine. (well maintained car with recent Motorcraft plugs of the right spec.)
Two days ago car starts to run like crap intermittently, then runs poorly full time. No power, rough, noisy idle.
Poking around, I discover the no spark on the 2 and 3 cylinders. Since I had a coil pack fail before in a similar way, I suspected it was the problem and got a new one. No change - still no spark on those cylinders (I did try some other ignition wires and looked at the #2 plug, which looked normal).

Is there some way these cylinders can be 'shut off' by the computer? A friend was supposed to lend me a code reader but he forgot and the local auto parts shops appear to no longer be doing free code readings. Any ideas???


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Old 08-05-2011, 07:44 PM  
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Is there some way these cylinders can be 'shut off' by the computer? A friend was supposed to lend me a code reader but he forgot and the local auto parts shops appear to no longer be doing free code readings. Any ideas???
No, other than the coil pack, plug wires, or plugs.

Did you use a spark plug tester to find out you had no spark?

It's possible that you got a bum part.
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Old 08-05-2011, 08:01 PM  
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No, I deduced no spark in 2 & 3 by disconnecting the wires one at a time (with the engine off, as to not prong anything) . The car runs exactly the same with 2 & 3 disconnected but will not run at all (it presumably does not run on 1 cylinder!) if 1 or 4 are disconnected. Also, I replaced each ignition wire by a new wire in turn and found no difference.
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Old 08-05-2011, 08:11 PM  
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So it could be compression, or fuel, and not spark. There's no reason why the computer would cut off 2 cylinders of fuel or spark. There's not really a good reason why you'd have perfect compression on 1 and 4, but not on 2 and 3. If you have a timing belt problem it would affect all 4 cylinders.

Someone more expert in SVTs will surely come to answer this thread. I'm going to change the thread title so that SVT peeps will look into it.
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Old 08-05-2011, 08:35 PM  
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What about the wires that run to the coil pack if there is no signal then there is no spark?
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Old 08-06-2011, 03:08 AM  
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What about the wires that run to the coil pack if there is no signal then there is no spark?

This.
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Old 08-06-2011, 07:15 AM  
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Thanks everyone for your input.

Thinking about how the coil pack must work:
There are 3 wires coming in.
One must be 12+ and another must be a trigger for firing.
As I understand it, this engine fires sparkplugs 1&4 or 2&3 at the same time.
Would the remaining wire be a signal that switches the spark between cylinders 1&4 and 2&3? A fault in this signal could be my problem.

I'm suspecting the connector/wire....
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Old 08-06-2011, 01:20 PM  
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Check the wires at the connector for the coil pack, it is a very well known problem for the wires to break right at the plug, and will cause the problem you are describing. Any Ford dealer should have that pigtail plug in stock if you do find the wires broke.
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Old 08-07-2011, 11:25 AM  
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OP (jmoryl) is very nearly correct.
The coil pack is actually two separate coils with a common battery feeder. One coil fires plugs 1 & 4 in series, while the other coil fires plugs 2 & 3 in series. The two coils have separate trigger leads coming from the PCM - very likely the one to the coil for plugs 2 & 3 is open circuited.
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Old 08-07-2011, 01:30 PM  
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I think the new part is bad myself, but check the plug, and the wiring harness for damage just in case. I'd return that coil pack in a minute. It's messed up. You should be able to prove that with a tester by testing the secondary resistance. The secondary being the coil output itself, test for resistance between that and the 3 plug wires. On one of those connections you'll get a reading in ohms on your 1 and 4 coil, and on the other one you won't.
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