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Lincoln LS random misfire

I have a 2000 Lincoln LS with random misfire problems at low idle. I have reviewed the postings in the read only section related to this issue, and it seems exactly like what I am experiencing. Problem is all of the recommendations have been tried. Car is better but still misfiring.

Main problem is that I cannot get the computer to register an misfire codes and it is clearly misfiring. Any thoughts or suggestions?


  • I hope someone reads this message. The problem thread has been made into a read only thread.

    OK here is what happened:

    I was driving down the road- around 55 mph. The ABS light came on, then my radio stopped working, I tried to roll my window up and guess what? You've got it, the window wouldn't go up, the speed odometer wasn't working. The whole control panel was off.

    The next thing I know is... I'm giving the car gas and I can tell its not running.. it kept cutting in and out.. eventually it just died.. with me driving down the road. I had to coast into a gas station! And then while at the gas station, the security system kept randomly going off and wouldn't stop!

    Does anyone have ANY idea what could be wrong? A friend tried jumping the car off, thinking maybe it was the battery, but that didn't help.

    I've had so many problems with this car.. blah, I could just cry.. its so expensive to get this thing fixed.

  • explorerx4explorerx4 Central CTPosts: 11,852
    i would have the battery tested, or just buy a new one.
    2017 Ford Fusion SE 2014 Ford F-150 FX4
  • akirbyakirby Posts: 8,018
    Sounds like bad coils - either wait for a code or have them tested.
  • akirbyakirby Posts: 8,018
    Sounds like a dead battery, loose ground or a PCM or other module. Probably not a DIY diagnosis or fix.
  • Have replaced the coils already. It is possible that I have defective replacement coils, but not likely. Also, if it were the coils, why only misfire at low idle and not while car is driving? And why no fault codes? This is very frustrating.
  • lamarlamar Posts: 9
    You can have a misfire that is not above the threshold to damage the catalytic converter. However, it will usually set a pending code that can be read by a scanner even though the MIL is not on.
  • Thanks for the reply. I ultimately had to suck it up and take it to the dealer. They found a constant fault on #2 and random faults on 1 & 3. Had them change the contacts on all 3 and change all the plugs. Everything seems to be great with the car now, but it wasn't a cheap fix thanks to having to remove the intake manifold to get to cylinders 1 - 3. Thanks Ford.
  • I feel everyone's pain. My misfires started in Aug. First cylinder #2 and #8 were reading as bad. The spark plugs were changed and were covered in oil. Everything was fine for 1 week then the engine light came on again. This time #8 was bad so the coil pack was replaced. (Very little oil on #8 plug this time) 2 Weeks later, cylinders # 3, 4, and 7 are misfiring and the car is idling as if I was sitting on a rickety washing machine. My buddy said that there could be gasket leak that’s allowing the oil to misfire the plugs. Any word on that from anyone?

    I made an appointment with the dealer today. Monday is the earliest date they have but I don't even think the damn car will make it until then. Today, it was hesitating and stalling so badly, cars were going around me. It was so shameful. It smells of rotten eggs, shaking so badly, and barely moves when I give it gas, until it has revved up to about 3000 rpms. The engine was squeaking and sound like an old beat up pick up truck. All this, from a Lincoln? I am too through! I had to leave the thing at work. Couldn't even make it home....
  • akirbyakirby Posts: 8,018
    When you found the coils covered in oil, did it ever occur to you to fix the leaky valve cover gaskets that caused the problem in the first place? If you had done that and replaced the damaged coils you'd be fine now.
  • It didn't occur to me that that was the problem because everyone was saying the coils and plugs were the problem. I assumed because the plugs were old that they were suppose to look like that. I am not a mechanic and was probably a little naive about the whole thing. All I knew was that it was hestating and that the things that I was told was wrong with it, I fixed. So sorry for me, huh?
  • heyjewelheyjewel Posts: 1,046
    Sorry for your problems. My LS at 80,000 runs like new. I love it. Knock wud.

    How many miles on yours? How long have u had it? What year? Maintained well? Who swapped the plugs etc? Dealer or shade tree mechanic? If dealer and they didnt mention possible oil leak being the problem, you should push back hard. OTOH, if you're having Joe Palooka work on it, well, ...
  • akirbyakirby Posts: 8,018
    I didn't mean to come across that way, I just hate to see people complain about a problem that should have been easily fixed the first time around. Oil doesn't just leak out of an engine for no reason and whoever fixed it should have realized that. Live and learn. Blame the car for having bad valve cover gaskets that ruined the coils but not for the repeat repairs.
  • Yeah, I hear you. Thanks.
  • There are speculations all over the internet on what this problem is and I have done almost all of them and I finally have found out EXACTLY what the problem is. A few things: it is NOT the coil packs from oil leaking from the gaskets. It is NOT the O2 sensors. It is most certainly NOT the fuel pump, so do not replace that.

    The problem is the PCV lines become old and damaged causing a vacuum leak and that is why the car idles rough and dies.
    It should cost a total of $500 dollars at a lincoln dealer and here are the part numbers and descriptions:

    3w4z-6767-ca connector
    f8cz-9e499-ba connector
    xw4z-9h486-ac gasket
    xw4z-9439-ad gasket
  • akirbyakirby Posts: 8,018
    Not if your spark plug wells are full of oil. That's a leaky valve cover gasket for sure.

    Rough idle without the oil leak or bad coils could be a vacuum leak.
  • :mad: I have owned my 01 LS V8 for 6 months, 60K miles. I had to replace the heater control valve, $250 from dealer. I am having the same problem with misfires. I work on it myself, and have fixed the problem. It is from a valve cover leak, which oil contamination destroys the COPS-Coil Over Plugs. The valve cover kit has an improved design not to allow the oil into the plug wells. It is hard and long to get the valve covers off, 7 hours the second time. Then, get a scan tool, or scan at autozone, it will tell you which cylinder is misfiring, change the COP and plug. I found the COP on Ebay for $18 each, good deal. They also have a COP stress test at the dealer, good investment or JUST REPLACE ALL THE COPS AND BE DONE WITH IT FOR 60K, maybe longer if oil leak is actually fixed. I had my car running great, now with no leak, good COP and new Plug cylinder 3 has misfire, WTF??? I think a stick of dynamite would fix this car and I would love to slap the POS that came up with this stupid engine!!! Lincoln should be ashamed of this car and should be taking steps to fix it, :lemon: which they are not.
  • This could be the problem, how did you come to that? My car gives codes for misfire, COPS and Plugs fix it, then car runs great. No idle problems. I will look into the PCV, but for now I think my harness has a problem, have you heard anything about that?
  • mookie3mookie3 Posts: 2
    I have a Linclon Ls 2000 V8 and my 3rd cylinder is misffiring. I wanted to know if would be hard to change it myself and what parts I would need to do so. Also my climate control keeps blowing on high even if I try to turn it down. I wanted to know if It would be hard to fix this problem as well; if not how much it would cost on average to fix these problems. Thanks.
  • stets2stets2 Posts: 2
    :confuse: 2000 Lincoln LS, fully loaded V8, 97K miles, in the 2 1/2 yrs I've owned the car the so called "random misfires" keep popping up. I'm not even sure if you call these problems random misfires. I would call them more of the car confusing itself as to what gear it's in. When the car is in reverse and it's backing up, without accelerating, it will skid to a stop like it's confused as to what gear it's in and then it releases itself and it's fine. Also, sometimes when I'm accelerating between 40-45 mph the car will grab itself like something is pulling it back and then again release itself and be fine. I've taken it in to the dealer several times and they've tried to replace things they think it could be but nothing has cured it. I just had the 7th cylinder replaced because it showed up as a misfire on the computer at the dealers. The 7th cylinder being bad was the only time the engine light came on. All the plugs and boots were just replaced and the problem is worse than ever. The dealer continues to tell me that "unless they can duplicate the problem then there's nothing they can do." I know nothing about engines and it seems that neither do these car dealer mechanics. They charge me $100 just to hook the car up to the computer and unless the problems happens while it's hooked up they don't know what it is. I've read all the responses and the PCV lines maybe what I try next. Can anyone help?
  • akirbyakirby Posts: 8,018
    The misfire is probably the COPs (Coil on Plug). Is that what they replaced or just the spark plugs and boots? Not sure about the tranny problem - have you had the fluid replaced?
  • stets2stets2 Posts: 2
    Coil was replaced too. I would hope the dealership would think of replacing the fluid if that was possibly causing the problem but who knows. I've taken the car in at least five times in the last year for the same problem and they haven't figured out the problem yet. I'm going to try a small town mechanic that's a friend of the family. I guess at least he could tell me if the dealership is hosing me or not.
  • christo1christo1 Posts: 3
    The primary fault is the valve cover gaskets. These DOHC motors have a gasket around the edge of the cylinder head, and an inner gasket which seals the center part of the valve cover from allowing oil to leak down to the spark plugs. It is the inner gasket which is the culprit.

    The stock inner gasket will fail and allow oil to leak down to the spark plug tops, which causes the coils to discharge voltage not only to the spark plugs but to the cylinder head (through an oil to ground short). Voltage will be lost at the plugs as a result of this short, and the check engine light can be intermittently tripped. This situation can also cause the coils to fail (on the diag).

    Dealers will want to replace the 'faulty' coils and plugs, make quick easy bucks and wait for the whole shebang to fail again, due to the real problem of oil pooling at the plug/coil interface due to the valve cover gasket problem.

    The real fix here is to do the valve cover gasket job using FELPRO (problem solver) gaskets. The felpro kit comes with an inner gasket that has multiple sealing ridges to prevent inner gasket failure. The stock inner cover gaskets don't have this feature.

    So: remove air intake plenum, remove valve covers/coils/plugs, replace with new plugs, install new felpro gasket set/covers and tighten, check coils OHM reading between poles (any that don't match the others replace), installl coils, retorque valve covers, install intake.

    This should do it. Works fine on my 2000 LS V6 Sport.

    FELPRO gaskets are by far the best on the market for any engine. Buy them and have the dealer do it if you don't want to tackle this project. This should/will 'permanently' solve the problem.
  • frank_1frank_1 Posts: 4
    Hi Christo1.

    My dad has the same 2000 LS V6. I just verified the oil fouled plug wells in the two rear cylinders (#5, #6) just like the P-Codes indicated. I am about to purchase the fel-pro gasket on-line, but did not know if they come as a pair or just one gasket (also getting new Motorcraft plugs). They seem very expensive. Could you please help me with a part number and where to get them for the best price? Finally, do you recommend keeping the same coils (no oil contamination) or getting new ones? I am not sure on what the typical life-span for coils are. I do not want to got through the trouble of messing with the intake plenum again! Thanks!
  • genetkygenetky Posts: 4
    I have a 2000 LS V8. I had the hesitation and stalling. I took it to my neighborhood mechanic, he told me that he thought it was the oil leaking down on the spark plugs and coils. He put new plugs in it. Said that everytime he cleaned it up and retested it it would give him a different cylinder misfiring. Took it to the dealer (sigh), they told me they thought it was the valve cover gasket oil leaking down and that it would need replaced. Plus the boots on the coils would also need replaced. $634.00. Then they called and said it was still not working right, that one of the coils needed replaced and the local mechanic put in Autolite plugs not Motorcraft, so they needed replaced. Now the bill is up to $942.00 Was happy it was over, I do like the car. I went to pick it , drove off, before I got back to work, check engine light, and it is running rough. :( They told me to bring it back in tomorrow they would look at. Would like to go in and tell them what to do, it is very apparent they have no idea what it is. Oh, I just went over 70K miles.
  • akirbyakirby Posts: 8,018
    Make sure the valve cover gaskets got replaced, then replace all the COPs. They'll just fail one by one over the next few months to a couple of years anyway.
  • genetkygenetky Posts: 4
    Yes, gaskets were changed. Atleast I paid for them to be changed. They changed 1 COP. The problem seems to be intermitint. I Tried to show it to a co-worker and it ran great, just the check engine light.
  • akirbyakirby Posts: 8,018
    Replace the COPs now or you'll be replacing them one at a time for the next 2 years.
  • Replaced the COP's. Runs great. Like a new car now. :)
  • Christo1,
    2000 Lincoln LS V8 Sport
    Thank you for the information. The Cadillac shop replaced coil 2 last week. I dropped my car off again yesterday. (Today after some pleding to fix my car right, they told me they really cant service Lincolns that well) Yesterday I was told I had to replace the remaining 7 coils to solve the problem. I read your information and called them this morning..I even faxed them the text you wrote. I told them I wanted them to locate the leak. Well, at 4pm I called them and they said the car was ready. They only changed the coil. I asked if there was oil and they said there was oil all over the place. I told them "it wasn't ready if the issue with the leak and gaskets were not resolved" along with a few more choice words. The manager called a FORD rep and there is a recall on the Tbird for the exact same problem. No recall for Lincoln. And there is a tech at Ford that knowns how to repair the issue. I'll be taking my car with that tech along with the word FELPRO. It's a great car just having a bad patch! Thanks again I know you saved me much time and money. (Pending Ford tech doing the job right. :confuse:
  • Hey Christo1

    Do you know if they make a FELPRO gasket for a V8 LS? Im having the same problem with my car, I pulled the plugs out and they were drenched in oil. Dealer wants 80 bucks for each gasket which i think is a rip off.
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