6.0 misses at idle occasionally - Ford Powerstroke Diesel Forum
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Old 07-16-2013, 03:33 PM
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6.0 misses at idle occasionally

Have an 04 6.0 that is missing at idle. Doesnt matter hot or cold. Had DDT( dealer diesel tech) scope it and needed new #5 injector and glow plug, R&R those. Showed had 20% loss compression while in missing mode. Drove it home missing and stopped missing on the way. Ran as smooth as silk. Let it idle at home, no probs. Put my SCT 50+hp tune back in and started cold in morning, no miss. Drove it 30 mi. no miss. Another 30 no miss. Next 30 mi. and missing. Miss is like bad plug wire without the wires. Took out tune and still missing at idle. Drove 20mi. and stopped to check codes, nothing but egt which is blocked, and not missing. Drove to dealer he scoped and no codes or issues. Both scratching heads. I was just about to have them pull heads but obviously not now. I have had just about everything done on this concerning OEM parts, plus the ARP kit. At the moment the truck is purring like a kitten. I travel for a living with it and breaking down on the hwy sucks. Any ideas what might be causing this occasional missing issue( assuming its coming back).
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Old 07-16-2013, 04:01 PM
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It is possible you have a loose connection to any of the injectors or FICM that is not registering a code. The trouble is, you need a monitor to catch it while it is happening.

Fuel contamination comes to mind. When was the last time you change the fuel filters or drained the low-point? Do you know what your fuel pressure is? Was this tested at the shop?

Compression loss has me puzzled? That is checked when not running and a 20% loss in one cylinder is significant. Are you sure he didn't say 20% low contribution?
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Old 07-16-2013, 04:21 PM
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I changes the fuel filters 8000 mi. ago, but changed them again this morning before taking off on test drive. Also changed my oil filter as I run Amsoil syn and change oil & filter between 8-10k and filter at 4-5k. It was a comp check as I believe he said 1,3,7, were at 340 and 5 was 280. We both considered it could be sticking lifter tho he had not seen this happen yet. The glow plug he changed was carboned up so we thought it might be possible that something is flaking off and slipping between valve and seat to cause miss. The problem with that thought is that when I brought it in it was a fairly severe miss, like pulling a plug wire, and non-stop. I asked about loose or chaffed wires/connections but that does not explain comp. issue.
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Old 07-16-2013, 04:33 PM
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You need to actually look in that cylinder with a digital camera bore scope. The flex cable needs to be nobigger than 8mm or it won't fit in the glowplug hole.

Examin the top of the piston cylinder walls; the valves the top of the head etc. You may have a chipped or burnt valve or damaged seat.
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Old 07-16-2013, 05:00 PM
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It was dealers plan to scope it but mech that owned the scope moved on along with his scope. I will be doing that when I find someone to do it. I do wonder tho how any permanent damage in there would allow the truck to run so good most of the time. Am I wrong in thinking that a sticking lifter could cause this problem? I am not overly educated about diesels but thanks to my 6.0 I will get there.
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Old 07-16-2013, 05:36 PM
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Quote:
Originally Posted by gypsystm View Post
I changes the fuel filters 8000 mi. ago, but changed them again this morning before taking off on test drive. Also changed my oil filter as I run Amsoil syn and change oil & filter between 8-10k and filter at 4-5k. It was a comp check as I believe he said 1,3,7, were at 340 and 5 was 280. We both considered it could be sticking lifter tho he had not seen this happen yet. The glow plug he changed was carboned up so we thought it might be possible that something is flaking off and slipping between valve and seat to cause miss. The problem with that thought is that when I brought it in it was a fairly severe miss, like pulling a plug wire, and non-stop. I asked about loose or chaffed wires/connections but that does not explain comp. issue.
Are you saying that, because you're running Amsoil, you change your oil at 8K-10K intervals? Amsoils claims to not apply to a Powerstroke. Oil change intervals on a Powerstroke should stay at 5K due to shearing in the HPOP
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Old 07-16-2013, 06:27 PM
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Guilty as charged. Was told by oil specialist that running a quality synthetic, one could extend the oil change intervals as long as you changed the filter half way between. Anyone else have opinions on this?
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Old 07-16-2013, 06:39 PM
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Quote:
Originally Posted by gypsystm View Post
Guilty as charged. Was told by oil specialist that running a quality synthetic, one could extend the oil change intervals as long as you changed the filter half way between. Anyone else have opinions on this?
ONLY if my UOAs keep passing would I think about 8K+ miles on oil. A 20% loss might be grounds for further investigation. I'm in the process of engine removal to chase a 6% issue along with hints of HG failure (on a studded truck, stupid thing...).
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