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Power Strokes
6.4 Tech
cylinder contribution test
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[QUOTE="Connor M, post: 1562452, member: 26837"] I replaced the hpfp and it doesn’t seem to be making oil but it has a misfire and it’s pouring unburnt diesel out of the exhaust. Sounded like the miss was coming the worst from #8 but after pulling it apart, I don’t see any damage to the rocker arm assembly and the pushrods don’t have an obvious bow to them at all. I’m gonna get a big set of calipers to get a measurement on them. No weird wear on the tips or the bridges. I only got a code for p0300. Injectors all passed the cylinder contribution test. All cylinders had good compression, ranging from 350psi to 375psi. I don’t think I have a cracked piston for this reason. No coolant in the oil or vise versa. No metal in the oil. I’m thinking if I can’t find something else obvious I’m going to pull the heads to check lifters and cam lobes. It will take some time to get my spare engine back from the machine shop and assembled, I think pulling these heads in the frame will be my fastest and cheapest option to see what’s wrong. Even if it turns out that something else is wrong i’m only out the cost of parts for a stud job which isn’t as much as say, buying new injectors. [/QUOTE]
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