dcw1 Posted November 25, 2021 Share Posted November 25, 2021 I have a 2010 Fusion that has an odd problem. 150,000 miles. About a year ago while driving it had sort of a misfire at a red light and started to run very rough. Check engine light came on and it was flashing also as I finished driving home. I searched the problem and symptoms on various forums. Common suggestion was spark plugs and/or ignition coils. So I replaced all plugs and coils. Started it up and it ran very smooth with no problems. For a few months. Then I noticed in the MORNING it starts fine and runs fine. But if I drive for about 20 minutes to go to a store, when I start it up after coming out of the store, it is rough again. And it stays rough until I turn it off and let it sit——it usually needs a few hours or overnight to then start and run ok. But if I go somewhere and shut it off, when I start it again, it is rough. Codes were were saying misfire (P201 and P301) on cylinder 1. Anyway, I figured maybe I got a bad plug or coil pack with the initial repair. So I accessed the plug and coil and swapped both the #1 plug and coil to a cylinder on the front of the engine. Also checked the plug gaps and made sure they were good. Started it up and seemed fine. But that was normal—— initial start up and run of the day is ok. So I crossed my fingers and the next day stopped at a store. Came back out and……. Good grief! Still has the same problem. Initial start up and run of the day is fine. But when I turn it off, it re-starts but runs/drives rough upon restarting. If I let it sit for multiple hours (like overnight) it starts and runs fine …….until I shut it off and restart within a relatively short amount of time. I’m not sure how long it has to sit “off” before it starts and runs ok. Overnight gets it to start and run ok. Sitting off all day at work also seems to be ok. But if I drive it in the morning and turn it off for say 20 minutes or even to get gas, it starts and runs rough and the “check engine” light comes on. This problem makes running errands a pain. Or I have to leave my car running while I go into the store. Anyway, any thoughts/comments/recommendations would be appreciated. Thx Regards, 0 Quote Link to comment Share on other sites More sharing options...
akirby Posted November 25, 2021 Share Posted November 25, 2021 Sounds like an electrical connection that goes bad when the engine warms up. Might also be the PCM itself. 0 Quote Link to comment Share on other sites More sharing options...
GCulotta Posted January 23, 2023 Share Posted January 23, 2023 NO WAY! - dcw1 - I'm praying you're still on this forum \ or receive this message somehow... Were you able to figure out the issue with your Fusion last year? ? I'm having the exact same issue. Actually everything in your post is identical to my situation, even down to the mileage. So before I take the intake off and go through all of the troubles you experienced, I figured would take a shot in the dark on this forum. Any info would be a huge help - was it the PCM? 0 Quote Link to comment Share on other sites More sharing options...
Bop Posted March 25, 2023 Share Posted March 25, 2023 All i could say is Ive found most electrical problems by simply wiggling and pulling on wires. Primary side of coarse. Have you moved around ice cube relays on the electrical box? Same technique. Any electrical connection at all will do it. The fact that it temperature induced somehow is interesting. Some solid state component maybe ??? Hope it not the PCM . If you really get to you're wits end you can always do the `C02 fire extinguisher trick. Puts some welders gloves on and don't freeze your fingers off. 0 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.