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Old 03-27-2013, 03:33 PM
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Injectors?

I've got an issue that I'm having trouble with that I can't figure out. I've got an '04 F350 6.0 (build date 17/04/04) and this is the most recent update about it.

Brand new FICM.
New batteries.
Passed cylinder contribution test.
Passed injector test (whatever they did for that I have no idea)
Failed compression test.
Blows blue smoke at constant low RPM and idle when cold.
New fuel filters.
New oil and filter post-Sea Foam

I Sea Foamed it, once in the oil and once in the fuel and three times through the fuel bowl. Ran like pure *** with the Sea Foam in the fuel so I switched to 2-cycle oil and I'm half-way through this tank. It's warmer today and I have zero misfiring, zero smoke and I have all the power that I should have at the drop of a hat without any hesitation. Basically it runs the way it should.

Is there anything that could have messed up the compression test and given me a false fail? It failed on #3, 5, 7 and 8 cylinder. I have no white smoke and no coolant loss so it can't be a head gasket or the EGR cooler.

Also, is it even possible to get a bad test on injectors? I'm thinking I have a few bad injectors when the shop gave it an O.K. It was tested when it was very similar temperatures while the truck was partially warmed up.

I'm not sure if this makes a difference, but when I was cycling the glow plugs this morning I could hear very distinct clicking with no real rhythm to it, constant but not even and a bit sporadic, but when I cycled them after work it was just a very faint, constant humming.

I'm getting ready to pull the heads and pull the pistons out but if I can check something else before I tear into it I'd much rather do that. Would an improperly torqued injector or anything like that have an affect, or would my truck have burned down by now? Any help is appreciated.
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Old 04-10-2013, 09:08 AM
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The only way that a bad injector should have past test is if they didn't flush it or they read the results wrong. When I test my injectors, we have a flush test, test 2 at 200 bar, test 3 at 200 bar, test 4 at 150 bar and test 5 at 100 bar. There is actually a large range they have to be in to pass test.
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Old 04-10-2013, 02:55 PM
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If it was a actual mechanical compression test and it failed you have a cylinder problem.
Only fix is to to determin the actual problem and actually fix it.

A releative compression test is open to misinterpretation since it is a calculaated value.
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Old 04-12-2013, 07:40 AM
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It wasn't a manual compression test, although I am going to do that before I pull the heads off. I figured I'd change all the rings and any damaged pistons and put in new injectors and go from there. NADP gave me a pretty good price on putting a new engine in so I might end up doing that if this fails... -_-
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