95 7.3 skip/miss uvch? - Ford Powerstroke Diesel Forum
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Old 01-23-2013, 03:54 PM
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95 7.3 skip/miss uvch?

Ok guys my 95 powerstroke suddenly developed a fairly rough skip. It's been quite cold out...about 16 degrees this morning and I've experienced some very hard starts with lots of white smoke after it finally starts and while cranking. Anyway I got my infrared thermometer and checked out my temps at the exhaust manifold. Number 5 and 7 both seem dead. I'm gonna pull the valve cover this weekend and see what's going on.

Should I replace the injector o rings while I'm in there since I'm having hard cold starts? And maybe glow plugs while I'm at it?

Let me know what y'all think.

Thanks for any and all input!

Ryan
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Old 01-23-2013, 05:31 PM
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I'm not much of mechanic myself since I just got my first diesel, but I have done plenty of reading to understand each component and how it is suppose to work. My bet would be not all glow plugs are heating up hence the hard start and white smoke. the miss would be something with the injector and if it is here and there, I would say it is probably the UCVH. May not need to replace anything, depends on how old they are and the condition there are in, may want to replace them. Just my .02
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Old 01-23-2013, 06:56 PM
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Yeah that's what I was thinking. I'm about 90 percent sure I have a problem with the uvch connector for cylinders 5 and 7. I ohm tested the gp's about a month ago and all on the that bank tested within range. Just don't know if I should tackle the injector orings on just that side or put it all back together after I fix the harness and wait to do all the injector orings and gp's at one time.

Could bad injector orings cause the excessive white smoke and hard starts when it's cold.

Oh I forgot to say that the truck was running fine until this afternoon. Cranked this morning with lots of white smoke and chugged for a bit but once warm ran fine on 40 minute drive to work. Leaving work it started fine, quickly with very little white smoke. Put into drive and then I noticed the skip.

Thanks for all the help

Ryan
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