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Message: [QUOTE="Fordcowboy, post: 245487, member: 312"] Been busy at work and out of town a bit, and with a spare vehicle the truck has been sitting, but I've had some time here and there to test some stuff out, just kept forgetting to post in here. It is the SES light, I just always seem to put CEL. Since it was pretty intermittent, testing wiring was a pain. Motor was usually well up to temp, and I was on the highway when it would start usually. I would try to catch it, when it was acting up, but wiring would test ok. So I got a good IDM just to see what that would do. By the time the IDM showed up SES light was constantly on, so I could also test wiring better. Good IDM, same problem, so I tested wiring again while I was in there with the IDM. At the IDM connector, all 8 cyls were out of range on Ohms. Drivers bank was between 4.8 and 8.9. Passengers bank was all around 6.5, except #5 with no reading. All wiring on top of motor looks to be good. Didn't have time to pull valve cover, but that's what's next. Probably replace both sides, and see where I am. I don't know how old this set is, so I might as well. Now I'm wondering why all cyls were reading high? Just old worn out UVCH? [/QUOTE]

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