Pukes coolant bad when tuned but doesn't when stock.

[joey011582]

I have a 2008 6.4 powerstroke job 1. It pukes coolant pretty bad when I get on it with the spartan 275 tune, I haven't noticed any loss of power, boost loss, or white smoke from exhuast. I put the stock tune without DPF and I can't get it to puke I tried doing everything I do on the 275 tune to get it to do it without success, what gives? Is the egr flash boiling the the coolant when the egr acts as a waste gate? I was told a head gasket will show bad even tuned stock. Also should I get the coolant flushed and put some ford coolant in it? I mixed the coolant with the prestone 50/50 green stuff and will this cause the problem? I read on here that it could cause cavitation and will cavitation cause puking? All suggestions would be appreciated. Thanks

[dieselkane]

You need to pressure test the cooling system for one. They also make a combustion gas leak tester, which checks for combustion gases in the cooling system. Oh yeah, the green coolant is incorrect for these engines, and can potentially cause problems as well.

Amazon

Amazon

[joey011582]

Ok I think I figured it out. The other coolant I was adding was the cause, I flushed the system and added the gold ****, 50/50 mix with distilled water and it all stopped. I was beating on it with the 310 tune with no problems. I guess the other coolant was causing cavitation problems and putting air bubbles in the coolant allowing it to flash. I notcied the coolant was aerated in the coolant bottle before I changed it. I guess the tunes were allowing the motor to spin up quickly and the other coolant was cavitating.

[dhanna6powerstroke]

I'd still pressure check the system. I've had a couple friends run 250, 275 and 310 tunes and it only pukes on the 275. MattP had the issues you described and it ended up being head gaskets.