2000 7.3 with coolant in fuel

[lubbockduncan]

I have a 2000 F250 with the 7.3 Powestroke. It has 193,000 miles on it. It runs perfectly. It has a lot of power. It idles smooth and it doesn't smoke. However when I kill it and let it set for an hour or more it puts coolant into the fuel system. I can open the water separator valve and it drains out antifreeze for the first 5 seconds or so. Also when I start it, it runs for a few seconds until the coolant infested diesel hits the injectors, then it loads up and dies. I can bleed the antifreeze out of the fuel and it will crank, or I can keep cranking on the starter for a while, it will blow a ton of white smoke and fianlly crank, run horrible, then clear up and run perfectly until I kill it and let it set again. My best guess is a crack in a head. I have tried running it without the cap on the coolant resevoir to keep the coolant system from pressuring up when I kill it and this doesnt change anything. Any suggstions? if it is a head how do I determine which one? Anyone had anything like this happen? Thanks.

[bigcountrysg]

I think it maybe caused by injector cups. Or it could be a cracked head.

[lubbockduncan]

Thanks Bigcountry, any ideas on how to determine the bad ones? or is my only option to pull all the injectors?

[bigcountrysg]

Don't take my word for it. As I am not a tech. As for detecting which ones are bad. The only way I know of is to tear down and inspect. I am sure Marc, Scuffy, Jon, or one of the other techs will have more info on this.

[bigcountrysg]

Another thing you may want to look at is your fuel tank. Make sure the coolant is not getting back there and contanimating your fuel tank. You most likely have to drop the tank and open it.