c02 test relaibility? 6.4 blown head. - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 07-19-2013, 01:37 PM Thread Starter
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c02 test relaibility? 6.4 blown head.

If my truck failed a c02 test how certain is it that my head gasket is blown?

What other tests can I have done to verify the current state of my head?
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post #2 of 9 Old 07-21-2013, 07:20 AM Thread Starter
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Originally Posted by Beatrice View Post
If my truck failed a c02 test how certain is it that my head gasket is blown?

What other tests can I have done to verify the current state of my head?
Sorry what my truck failed was the dye test
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post #3 of 9 Old 07-21-2013, 07:23 AM
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If your truck also has leaking EGR cooler(s) on it, this can cause positive results on the dye test.

Measure the cooling system pressure when you're honking on the truck - if it rises to or exceeds 16psi you will need to pressure test the EGR coolers first, then evaluate the head gaskets.

What are the symptoms you are experiencing to get you to the point where you got the cooling system checked for combustion gas?

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post #4 of 9 Old 07-21-2013, 11:25 AM Thread Starter
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Originally Posted by Big Angry Hillbilly View Post
If your truck also has leaking EGR cooler(s) on it, this can cause positive results on the dye test.

Measure the cooling system pressure when you're honking on the truck - if it rises to or exceeds 16psi you will need to pressure test the EGR coolers first, then evaluate the head gaskets.

What are the symptoms you are experiencing to get you to the point where you got the cooling system checked for combustion gas?
Im not experiencing any real symptoms, i just bought the truck from an out of town dealer. The alternator went out five days later i took it in to have it replaced at my trusted local shop and asked they go over the engine as it is a new purchase. They did the dye test and it failed, it also had a slight misfire on cylinder six. I took the truck back to the dealer, they did a pressure test and didnt find issues. They then would not tell me if the truck passed or failed a dye test they instead said it was an out dated test and wouldnt matter anyways. Im really trying to understand what to believe.
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post #5 of 9 Old 07-21-2013, 11:35 AM Thread Starter
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By pressure test i dont mean a cylinder pressure test, i believe they just monitored the pressure in the coolent system,
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post #6 of 9 Old 07-21-2013, 12:59 PM
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By pressure test i dont mean a cylinder pressure test, i believe they just monitored the pressure in the coolent system,
That's all that matters. The cylinder 6 misfire though would really have my attention

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post #7 of 9 Old 07-21-2013, 02:03 PM Thread Starter
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That's all that matters. The cylinder 6 misfire though would really have my attention
I have to also include that there was also a leak found in my coolent line, this made me feel the dye test was so important. My thought process is if there is a leak in the coolent system what good is a pressure test. Am i far off?
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post #8 of 9 Old 07-22-2013, 07:51 AM
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That's all that matters. The cylinder 6 misfire though would really have my attention
Are you thinking an injector is causing the misfire?

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post #9 of 9 Old 07-22-2013, 09:04 PM
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Cylinder misfire can also be attributed to coolant being introduced during the combustion process (a compromised head gasket). Which in turn, could explain the questionable dye test results. It wouldn't take much coolant at all to produce a misfire though. Has the cooling system ever required a top off?

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