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Old 05-04-2006, 12:38 PM   #1 (permalink)
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The Duratec in my '04 Taurus started running a little rough a couple of weeks ago, but it was intermittent and only lasted a few seconds. The SES light never came on. I thought maybe I got some bad gas or something.

About a week ago, it sputtered again and the SES light came on. I took it to AutoZone and they kept getting a Link Error on the code reader. I decided the guy running the reader didn't know what he was doing and planned on heading to another store when I had a chance. The next day the SES light went out and everything was running good.

Yesterday, the SES light came on again. I took it to another AutoZone and they were able to read the codes, all SIX of them. He got P0351, P0352, P0353, P0354, P0355 and P0356.

Any ideas as to the cause? Would this be covered under the extended Powertrain Warranty?

It has the coil on plug, but I can't imagine that they all went bad at once.

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Old 05-04-2006, 03:21 PM   #2 (permalink)
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Here's the COP troubleshoot guide for the V8 SHO which also has COP:

Coil on Plug Test
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Old 05-04-2006, 05:49 PM   #3 (permalink)
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Didn't they get rid of COP after 2000?
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Old 05-04-2006, 06:56 PM   #4 (permalink)
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Quote:
Originally posted by winter_war@May 4 2006, 12:38 PM
Would this be covered under the extended Powertrain Warranty?
It certainly should be, and the first thing I would do is bring it into the shop.
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Old 05-04-2006, 07:14 PM   #5 (permalink)
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You have a loose wire or something somewhere at the point the initial signal distributes to the six


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Old 05-05-2006, 05:53 AM   #6 (permalink)
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The coils are all fed from a single 12V source. The grounds go back to the PCM individually and there is where the switching occurs to fire them.

There is a connector somewhere that the 12V source is coming from.
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Old 05-05-2006, 05:56 AM   #7 (permalink)
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Quote:
Originally posted by SHOZ123@May 5 2006, 04:53 AM
The coils are all fed from a single 12V source. The grounds go back to the PCM individually and there is where the switching occurs to fire them.

There is a connector somewhere that the 12V source is coming from.
Which is basically what I said.

Since all of them are misfiring it is something that is common to all of them


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Old 05-22-2006, 07:53 PM   #8 (permalink)
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***UPDATE***

I farted around with this problem off and on for a couple more weeks and tried to figure out what the problem was to no avail. Everything appeared to indicate a PCM problem. It was so intermittent, I wasn't sure of anything.

Took it to the FORD dealer early this morning and told them to fix it... The service manager made sure to tell me it could cost up to $170 just for the diagnostics. Then there would be the parts and labor to make the repairs.

The shop manager called me after lunch to tell me what was going on. Here is a summary of what he said:

"It's a recently discovered problem on the newer Taurus. There appears to be an intermittent low voltage condition at the PCM that causes all the symptoms you described. The FORD engineers are aware of the situation and are working on a solution. At this time, they don't have any kind of fix for it and it could be July or August before they have one. Don't quote me on this, but FORD will probably issue a recall for this. We reflashed your PCM and cleared the codes. Your car is ready to pick up anytime you are ready. There will be no charge for the service."

It seems to be running good now, but it did that off and on before I took it in. I hate the thought of waiting until July or August for a possible fix. I asked about replacing the PCM and the shop manager said "it would just do the same thing." You can be sure that I'll be taking it back in, when or if starts doing it again.

The intermittent symptoms were weird...

Multiple OBDII codes, P0351 thru P0356
Engine running rough, SES light off
Engine running rough, SES light on
Engine running good, SES light on or goes out after a few miles
A/C compressor turns off and on (PCM Controlled?)
Doors unlock and lock while driving
Anti-Lock Brake error displayed when coming to a stop (Stalling?)
Stalling in traffic (did this once)
Average MPG keeps resetting to zero
Complete loss of electrical power, no lights, no door locks, no anything and some kind of relay clicking continuously under the dash (did this twice while parked, but cleared up after switching ignition on/off a few times)
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Old 08-29-2006, 05:46 PM   #9 (permalink)
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We have pretty much the same problems with our 2004 Taurus Sel Wagon. Two Ford dealers have not been able to fix it.

I did notice the when I installed a new battery the problem went away for a good while. I now (monthly) clean the battery terminals and connectors really well and coat them with dialectric grease. So far it is working.

Hope this helps

Mike
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