Recently changed the injectors on my 99 f250 powerstroke. 208,000 miles. Did the whole job and the truck started and idled for about fifteen minutes. I started to drive it for about thirty seconds when a lot of pressure started coming out of the antifreeze overflow. On a gas motor this would be a sure sign of a blown head gasket, but i didn't do anything to provoke this and this was never a problem before. Any ideas?

 

Did you put stockers back in or big injectors?

 

Stock. Everything is stock except for air filter and straight pipe

 

Look at the injectors you pulled out, I would bet that one looks alot differant then the other... Because the injector cup came out with it. Stop driving it!

You have one or more cracked injector cups or loose injector cups.