Head gasket

[Bryan101]

Miss fire in cylinder 6... spark=yes;;;;Fuel=yes.... pull spark plug and put truck in clear flood mode= water shoots out of spark plug hole....

 

[Big Jim M]

Question? With the spark plug in place when running the engine does the radiator overflow? If you do have coolant in the cylinder you also have compression inside the radiator which WILL cause the coolant to puke out and the engine will overheat.
Without these symptoms put another known good sparkplug in there and see if it fires.
A great number of heads are removed without the need for removal.
Big JIm

 

[Bryan101]

yea i put a know good spark plug in it and it has 5kv then after a few secs it drops down to 0kv and dwell does the same thing. pulling the head after work today.

 

[Big Jim M]

Really, really, really sounds electrical from here! Doesn't one bit sound like head problems.
Big JIm

 

[Nhaz]

5k seems about 15k too low.

 

[Bryan101]

turned out to be the head gasket... almost got it all back together.. All i got to do is fill up the radiator and change the oil...

 

[richind]

What is the mileage on your Ranger when this happened? That is a felpro gasket that failed (I had one fail exactly the same way). That means that head has already been off at least once.

 

[stx4.0]

I agree.I would find out why there has been that many gasket failures otherwise your most likely going to have another one.

 

[shane96ranger]

That is a felpro gasket that failed (I had one fail exactly the same way). That means that head has already been off at least once.

Doesn't Ford use FelPro from the factory on the 4.0 V6? My Mustang had FelPro from the factory. It sounds like it's too late, but I have a suggestion; I use the Permatex Copper Head Gasket spray. It helps heat transfer and fills in any minor imperfections.

http://www.permatex.com/products/au...r_Spray-A-Gasket_Hi-Temp_Adhesive_Sealant.htm