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LS not running smooth at constant speed

logilslogils Posts: 1
edited April 2014 in Lincoln
I have an 2004 LS with a 3.0L V6 and 89K mi. The car has a skip around 50 mph for the last 50k mi. I have had all the coils and plugs replaced and recently one cat. The car now has a pulsating feel at constant speed. It is most noticable while in cruise control.


  • toomanyfumestoomanyfumes S.E. Wisconsin Posts: 916
    I know if the coils are going bad you'll feel that skip at around 50. Maybe one of the new one's are bad? My '05 V6 does the same thing-only at around 50 MPH.
  • I've had the same problem with my V6. Dealer changed out first #'s 5 & 6 cylinder coils & plugs in Sept. Then last week cylinders 1,2,3 & 4. It was costly. this BETTER fix the problem.
  • toomanyfumestoomanyfumes S.E. Wisconsin Posts: 916
    I feel it only about once a day, usually on the same spot on the same road. :confuse:

    It's just a minor annoyance now, I hope to make it to summer and if it gets worse I'm going to replace all six coils, plugs, and the pcv while I have the manifold off.
  • lsmummylsmummy Posts: 3
    Unfortunately guys, I have had everything replaced, and this still happens. The mechanics told me that it is a flaw in the LS engine. I love this car, but it is very high maintenance. Now I am having the overheating problem.
  • akirbyakirby Posts: 7,793
    I don't know of any "flaws" with the LS engine per se. Some of the components have issues (cops, hydraulic fan) but those can be fixed.
  • lsmummylsmummy Posts: 3
    Yeah, I guess flaw is the wrong word, but the guy I talk to from Lincoln told me that this specific problem with the valve covers leaking is VERY common. Like I said, I have a love/hate relationship with this car. I have done and have had a lot of work done to it.
  • akirbyakirby Posts: 7,793
    Yes, the valve cover gaskets and cops are a known problem. I thought you were talking about some fatal flaw that couldn't be fixed.
  • lsmummylsmummy Posts: 3
    No, but it feels that way when I had everything replaced and it is happening again. Is there possibly something else causing it again?
  • akirbyakirby Posts: 7,793
    If they're leaking again then either they weren't actually repaired the first time or the repair was done incorrectly. The problem was with the original gasket - not the engine itself. Once repaired properly it shouldn't return.
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