Testing blown HG or EGR Cooler - Ford Powerstroke Diesel Forum
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Old 01-18-2008, 12:56 PM
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Testing blown HG or EGR Cooler

How do they perform the tests? My truck is going in on Wednesday and I just want to know how they can tell for sure. It seems to me some of the symptoms are the same. I am sure they can perform a leakdown test on the cylinders, but what will they do to test the egr cooler?
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Old 01-18-2008, 01:38 PM
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bump.................
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Old 01-18-2008, 03:35 PM
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here is a bump i would like to know too.
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Old 01-18-2008, 04:13 PM
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well, the way i do it, i get a truck losing coolant, first i check the coolant for color then check the oil, see how the truck is running if it runs horrible i check what we call relative compression with a scan tool, this just monitors the accelerations of the crankshaft with the crank sensor and will show the change in compression in relation to the other cylinders, if that fails then i go to a manual compression check or i use this dye we have that checks for combustion gases in the coolant and if it's a head gasket it would be found by one of the above tests, now a egr cooler is much easier, you can use a coolant system pressure tester to pressurize the coolant then look at either the y pipe (sometimes coolant can be seen running out of it), or take the egr itself out and jack the rear of the motor up to see if coolant is present in the intake....most of the time the jack is not needed because the coolant is shooting out....and then if your positive you dont have a headgasket problem and your cant find a leak in the egr cooler just by looking, you can pressure test the cooler off the truck with some adaptors and air

Last edited by fordtech2004; 01-18-2008 at 06:00 PM.
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