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2003 Ford F-150

Question: Coolant in Cylinder 5. Whats the cause?

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randybgky, 5.4L V8, Hendersonville, TN, September 14, 2011, 15:36

 Enthusiast

Got Service Eng light on. Codes read Cylinder 5 misfire. I removed COP and plug and found cylinder 5 half full of coolant. No other cylinders affected. Can this be coming from the intake or is it most likely the head? Is this a common problem on these Mod engines? Thanks in advance for any info.

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• Answer #1

  mastertech6371 September 14, 2011, 16:30
  

   Master

  ford has huge issues with the corners of the intakes leaking and filling the cavity of the coil boot with coolant and causing missfires and such. when you remove the plug, the coolant goes into the cylinder.
  I would get a pressure test to confirm the intake is leaking. if it is not, then you may have a blown head gasket. let a shop confirm it for you.

  Roy
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