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Old 11-12-2013, 04:54 PM
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Calling all pros

Ok here's my deal, I've got a 96 f250 4x4 m/t and its got a lope at idle that comes and goes. Things I have done include ipr, Icp, crank sensor, fuel pump, all fuel lines in valley, religious oil changes at 4k, fuel filter at 8k, checked all valve cover connections and replaced one I found damaged, ots, and I'm sure I missed something but that's all my noggin can think of. I ran a buzz test and it threw the code that it passed, so I ran a cylinder contribution test and it also passed. I did notice I'm getting some blowby out of my dipstick tube that I didn't think it had when I got the truck. Any help on this would be greatly appreciated!
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Old 11-12-2013, 05:26 PM
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Anyone out there?
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Old 11-12-2013, 05:36 PM
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Do you still have the factory Dual Mass FlyWheel (DMFW)? If so, it can cause issues. Nevermind if it already has a SMFW. Cheers!
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Old 11-12-2013, 05:46 PM
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Ya I think I do have the factory flywheel, what kind of problems do they cause? I've heard once before of a vibration. I haven't had to put a clutch in since I've owned it.
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Old 11-13-2013, 05:57 PM
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It can cause vibration, mimic an injector miss, cause it to fail contribution tests, crack bellhousings and other stuff. You can remove the inspection cover and make sure all the dampening springs and retainers in the flywheel are still there. You can measure the free rotational play between the two masses at the rim. It should be less than 5/8". Not saying that's the source of your lope, but something to check out. Cheers!
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