Dismiss Notice



Register Today It's free! This box will disappear once registered!

2003 4.0 SOHC misfire after car wash?!

Discussion in 'Stock 2002 - 2005 Explorers' started by phillip723, June 2, 2019.

^^Searches ExplorerForum.com^^





  1. phillip723

    phillip723 New Member

    Joined:
    January 26, 2017
    Messages:
    21
    Likes Received:
    1
    Trophy Points:
    3
    Location:
    Southwest Michigan
    City, State:
    Michigan
    Year, Model & Trim Level:
    2003 Explorer XLT
    okay, 2003 Explorer XLT 4.0 SOHC. Truck sometimes would misfire when started cold in the morning after sitting overnight. Always stopped with throttle and when warmed up. Just one cylinder, occasionally would set CEL and always P0306 and P0316. Kind of forgot about it because it hasn’t been doing it as much as the weather warms up. Lots of rain the past few weeks and it still hasn’t done it.

    Today it was starting to get nice and I took the explorer through an automatic car wash, including the undercarriage wash where it sprays a lot of water up from underneath. Truck drove in fine, and once I came to the stopping point I put in park and shut it down. Upon start up it immediately began missing. Harder than usual. By that I mean it felt worse and it took more throttle and driving around for it to stop completely. I opened the hood while it was missing and noticed a lot of water under there. I’m thinking the plug wires got wet and shorted? Maybe that would explain the occasional cold misfire in the mornings too, like maybe some dew on the wires? Any help appreciated, when I get a chance soon I’ll try the water spray on the wires test and see what happens. Just wondering if anyone has experienced something similar with theirs. Any help appreciated.
     
  2. Support EF

    Join the Elite Explorers for $20

    Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no ads, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create more private Conversations, and more. Join Today. Your support is greatly appreciated.



  3. mountaineer2004

    mountaineer2004 Elite Explorer

    Joined:
    October 28, 2014
    Messages:
    205
    Likes Received:
    24
    Trophy Points:
    28
    Year, Model & Trim Level:
    2004 Mountaineer (V8)
    I had the same problem. Water leaks down onto engine, from wiper cowl attachment points.
    Stupid design by Ford. Use silicone, below attachment points, to stop leaks. You're problem will go away (hopefully).
     
  4. shucker1

    shucker1 Elite Explorer

    Joined:
    May 4, 2008
    Messages:
    2,064
    Likes Received:
    407
    Trophy Points:
    103
    City, State:
    Metairie, Louisiana
    Year, Model & Trim Level:
    98 XLT 5.0
    If the spark plug sits inside a well in the cylinder head my guess is that one of the wells got full or water.

    Pull the spark plug wire out of the well and blow the well clear with compressed air.

    Same thing happened to my 2011 Fusion with Inline 4 after I got too aggressive cleaning the engine bay.
     

Share This Page







We Support Our Troops!