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2004 4.0L Cold start issues

Discussion in 'Stock 2002 - 2005 Explorers' started by JCark01, January 5, 2017.

^^Searches ExplorerForum.com^^





  1. JCark01

    JCark01 New Member

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    City, State:
    Schenectady
    Year, Model & Trim Level:
    2004 Ford Explorer
    When it's below below freezing outside my explorer has trouble starting and initial rough idle. When I scan for trouble codes I get P0302 which is a misfire on cylinder 2 and a P0316 which is engine misfire detected on startup. Once it's been running for about 30 seconds to a minute the rough idle goes away and everything works fine. My mechanic compression tested each cylinder and it came back above 150 PSI for each cylinder. I checked the IAT and ECT sensors live data (with torque OBD-II app)and they seem to be working properly. Any ideas what would cause this? I already did new plugs, wires and a coil pack. Any help would be greatly appreciated! Let me know if you need for info.
     
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  3. JCark01

    JCark01 New Member

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    City, State:
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    Year, Model & Trim Level:
    2004 Ford Explorer
    Can anyone help?
     
  4. plasticseng

    plasticseng Active Member

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    City, State:
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    Year, Model & Trim Level:
    2002 XLS
    Fuel injector leaking or sticking?
     
  5. ronixd

    ronixd New Member

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    Year, Model & Trim Level:
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    My explorer is doing the same exact thing! I have a p0306 and a p0316.
    new dorman intake manifold, new motorcraft plugs, new cop boots.
    I have moved the cops and fuel injectors around but the misfire stays in cylinder 6.
    Compression for 1-4 is 190psi, 5-8 170psi. I hooked up a vacuum gauge to the brake booster vacuum line, upon cold start up gauge starts at 180inhg then immedietely drops to 140inhg for around 4-6 seconds then climbs back to 180inhg and steadily stays there as it should. this only happens during a cold start or after the engine being off for around 30 min. I could post a video of the vacuum gauge but I don't know how.
     

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