water in #6 cylinder spark plug cavity? Throwing a #PO306 code

Asked by Ron Aug 02, 2021 at 11:58 AM about the 2005 Mercury Grand Marquis LS Premium

Question type: Maintenance & Repair

2 Answers

F_O_R answered 3 years ago

Been washing your engine? Don't! Blow out the water and install a new coil. Check all the other cylinders while you are at it.

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James answered 3 years ago

If it's coolant your intake manifold (plastic) has most likely cracked and is leaking in the cylinder. Those engines are notorious for that! Hope that helps! Jim

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