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Old 12-30-2012, 10:26 PM   #1 (permalink)
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Default miss under light load 3.0 dohc sable

Hi guys, well I,m new to this sight, gotta confess here I,m really a Mopar guy but we do have one Ford in the family, so here is the problem under light throttle usually after the car has gone into o/d there is a miss that is quite prevalent you can also detect it at idle in park slightly, the car is a 2004 sable 3.0 ltr dohc, the problem developed a month ago or so and gradually getting worse, the car has 214000kms on it, we got some service records with it but I dont see any plugs on them, they must of been done sometime?, I,ve heard a lot about "c.o.p" coil problems and the history shows two replaced before but not sure which ones, I have a scanner, there are no codes and no "mil" on. I am going to check the plugs soon the rears like like you would need to remove the upper plenum, is this correct is there any shortcuts?, thanks in advance
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Old 12-30-2012, 10:40 PM   #2 (permalink)
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If you have small hands, you can get to the rears by removing the cowl panels, but have found it much easier to remove the UIM.http://www.taurusclub.com/wiki/index...on_the_Duratec
Try this to see if it helps you.
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Old 12-30-2012, 10:54 PM   #3 (permalink)
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hmmm...ok thanks I read the artical and as I do not have small hands I think the upper intake is the way to go it looks fairly easy, do you know if there is a gasket required?, it looks like maybe its rubber?, re-useable?, not to mention I sealed up parts of the upper cowl as there was a water leak in this car to
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Old 12-30-2012, 10:55 PM   #4 (permalink)
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I think you have to remove the UIM on a 2004+ (not enough room). When you take the coils out, inspect them very carefully for small cracks. You can also ohm them if you want.

I would replace the gaskets while you're at it.
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Old 12-30-2012, 11:13 PM   #5 (permalink)
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ok thanks, do you know what spec resistance the coils should be?, these plugs arnt like those on the Tritons are they? where they can break in the head?
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Old 12-30-2012, 11:22 PM   #6 (permalink)
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I think about 0.5Ω primary and ~13 kΩ secondary. They're standard-type plugs.
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Old 12-30-2012, 11:53 PM   #7 (permalink)
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ok thanks, good news on the plugs, so I think I will start tomorrow with replacing the plugs, sounds like Autolite is the way to go, (got some good accounts at the jobbers), and check the "cops" for cracks and resistance, on a last note though the miss goes away when you stomp on it with decent power, one would think an ignition miss like plug or coil would make it worse therefor making this seem more vacuum related, I worked in a Ford service dept back in the early ninetys and EGR issues were big with Fords then is there any kind of known issues on this motor?
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Old 12-31-2012, 11:01 AM   #8 (permalink)
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^ Dpfe (egr pressure sensor) failures which usually throw a po401/402 code.
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Old 12-31-2012, 12:07 PM   #9 (permalink)
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ok thanks, thats the odd thing, no codes?, anyway I just finished having another look, the cracks that are mentioned to look for on the cop coils I suspect would be visible from the top?, I pulled the front three and they look fine, there really is nothing to see underneath, just a rubber boot, the plugs currently in it are ngk tr55ix, iridium, although I am not a big fan of ngk personally, I do know they are a decent plug and they have to have been in at least 50k or so, what do you think? these or autolites, I am not using motorcraft as they are only available from the dealer where I am and I have no connections there and refuse to get bent over, I will stick with the jobber, I don,t see any cracked vacuum lines nor here any leaks, I will clean the maf while I am in there but dont suspect that as a problem, thanks
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Old 12-31-2012, 02:29 PM   #10 (permalink)
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well I went for another ride this am and discovered something new, this problem as mentioned earlier only happens after the car has shifted into od, so I tried slipping it into drive while it was acting up about a dozen times and it went away imediatley, is there any od issues with these cars?, of course the rpm increases when it goes out of od but I tried bringing the rpms down to 1500 in drive and applying light acceleration and could not re-create the problem
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