Sommerville
New member
- Joined
- Mar 12, 2025
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- My Lincoln
- 2011 MKS
Hey Group. I'm new here. I've inherited my dad's 2011 MKS. It's in great shape but does have one issue. It's all of a sudden started to misfire but in an odd way.
It's been showing 2 codes, P0201 and P0301. The odd part to me is this: When I start it for the first time of the day it runs perfectly. No issues, no misfires. After the engine has been running for 30 plus minutes and comes to operating temperature, still running fine, and then turn it off and restart 10 minutes or more later it has an immediate misfire. The engine has to cool off entirely (4-6 hours) before it will run properly again. If I don't turn it off and just let it run all day, I can drive 500 miles with no issue. It's only after I've turned it off and started it up again that the problem arises.
To me this feels like and electrical issue. I know it is not a coil issue. I have swapped the #1 coil with the #4 coil and I get the same cylinder 1 error codes. I thought it could be a faulty switch or relay feeding the injector. Once it gets hot and the power is removed it won't make a connection again until it cools down. As far as I can tell there are no single relays or switches that feed only the #1 cylinder. I am now thinking it could be a faulty solenoid in the #1 injector. Like a relay, once it gets hot and the power is removed it will not operate correctly again until it cools off. I'm hoping this isn't a harness issue or and ECU issue.
Does anyone out here have any ideas or suggestions on a path to follow to get this beautiful Lincoln back on the road? I'm trying not to give my local Lincoln dealer their next lease payment on their new shop.
It's been showing 2 codes, P0201 and P0301. The odd part to me is this: When I start it for the first time of the day it runs perfectly. No issues, no misfires. After the engine has been running for 30 plus minutes and comes to operating temperature, still running fine, and then turn it off and restart 10 minutes or more later it has an immediate misfire. The engine has to cool off entirely (4-6 hours) before it will run properly again. If I don't turn it off and just let it run all day, I can drive 500 miles with no issue. It's only after I've turned it off and started it up again that the problem arises.
To me this feels like and electrical issue. I know it is not a coil issue. I have swapped the #1 coil with the #4 coil and I get the same cylinder 1 error codes. I thought it could be a faulty switch or relay feeding the injector. Once it gets hot and the power is removed it won't make a connection again until it cools down. As far as I can tell there are no single relays or switches that feed only the #1 cylinder. I am now thinking it could be a faulty solenoid in the #1 injector. Like a relay, once it gets hot and the power is removed it will not operate correctly again until it cools off. I'm hoping this isn't a harness issue or and ECU issue.
Does anyone out here have any ideas or suggestions on a path to follow to get this beautiful Lincoln back on the road? I'm trying not to give my local Lincoln dealer their next lease payment on their new shop.
