5.4 Expedition - signs of Blown Head Gasket? PLEASE HELP (pics)
Today on a drive to the store, my 99 ford expedition 5.4L (147k miles) started to shake / vibrate heavily during acceleration from 5 mph to around 35mph, then it would drive like normal. I drove it the rest of the way to the store with no problems, shopped, and on the way back it was much worse. Same heavy shaking from the engine from 5 - 35mph then it would clear up after that. Then it started to make some sounds that went along with the vibrating, a putt putt putt kind of sound along with somewhat of belt squeek noise. Then came the smell of antifreeze. I pulled over, checked under the hood and saw a light chocolate looking residue on the bottom of my oil cap. I waited a little bit and drove it the rest of the way home. At some stop lights, it would have terrible acceleration, and at others, it would drive like normal. I got home and popped the hood after I shut it off and heard a hissing down by the passenger side head near the firewall. I opened the coolant container and it had some pressure in it. My oil cap had the same milkshake looking color. I then noticed down on the passenger side head, there was milkshake liquid everywhere, it was already cooked on the head but it was leaking on the frame rails so it was fresh.
Is this the sign of a blown headgasket?
Is the best way to check, to go get a pressure tester?
If anyone has had this issue, please chime in!! I'm stranded without this vehicle.
Pictures - taken from passenger side wheel well.