pcassidy111 Posted June 10, 2008 Share Posted June 10, 2008 05 6.0L with no mods but it does pull a 10K trailer. Noticed it was using a little coolant, about a pint a day-never overhated so I pressure checked it, held at 16 PSI for hours. Started it up an noticed a little puff of white smoke so I block checked it-it failed in 3 pumps, CO in the cooling system. Didn't notice any soot in the recovery bottle. Question is, in your experience on these motors will a bad (leaking) EGR cooler show up with a a block check or just head gaskets? I checked it after letting the truck warm up from a cold start, runnig at 1200 RPM. Quote Link to comment Share on other sites More sharing options...
Alex Bruene Posted June 10, 2008 Share Posted June 10, 2008 An EGR cooler leak can show combustion gasses in the coolant just as a head-gasket would. But in your case, since it sounds like you may have coolant getting in the exhaust, I would lean towards an EGR cooler issue, rather than a cylinder head sealing issue. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 11, 2008 Share Posted June 11, 2008 Yes it works for both, combustion gasses are the same regardless of the source. Quote Link to comment Share on other sites More sharing options...
pcassidy111 Posted June 11, 2008 Author Share Posted June 11, 2008 THis is my first encounter with a diesel with combustion gas in the coolant, I work at an independant. I lifted the back of the truck and pressurized the cooling system but did not see any coolant when I pulled the EGR valve. Short of pulling the EGR cooler and pressure testing it how can I determine if it is the EGR cooler or head/headgasket problem? When you find CO in the cooling system is it usually an EGR cooler problem or a headgasket problem. This vehicle has never seen any modificatios other than an exhaust temp gauge and many have said that stock engines do not blow headgaskets. How do you decide which direction to go? Or do you have another diagnostic routine that does not rely on block check fluid to find combustion leaks into the cooling system/coolant usage problems. I should add that I have no cold start misfires or idle misfires like I would expect with a blown head gskt. Quote Link to comment Share on other sites More sharing options...
Aaron Posted June 11, 2008 Share Posted June 11, 2008 There's currently a truck at our shop that has gone through 2 egr coolers, a heater core, and 2 oil coolers. Tech down the hall from me at work looked at the warranty history, and came to his own conclusions (correct, mind you), brought it over to me and showed me, we both had a pretty good laugh. This truck has around 36k miles on it, and hauls 10,000lbs every day. Head gasket failure at this low mileage. Doh! Quote Link to comment Share on other sites More sharing options...
pcassidy111 Posted June 12, 2008 Author Share Posted June 12, 2008 This truck belongs to the shop owners father in law, he hauls a 13K pound travel trailer around. Already has over 100K miles on it. If I can confirm EGR cooler I will fix it, heads and we will send it to the dealer or the shop owner can do it, I cannot tie up that much time into 1 job. Quote Link to comment Share on other sites More sharing options...
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