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Message: [QUOTE="firehunter, post: 236652, member: 1162"] I have had a very random no start issue, only 3 times in the last two months. Complete no start with tons of white smoke from the tailpipe (and under the hood but that's another question...). After waiting around 5 - 15 minutes I go try it again it coughs, sputters, then runs completely normal (very good) for a week or two then no start again. Always with white smoke. Irregardless of ambient temps. Sometimes the first start of the day, one time coming back from lunch in the afternoon. I was told to check the glow plug system. Between a manual and a youtube video (ugh, I know) I was able to use my DMM and found some things out. [B]GPR[/B] - Very first time the key is turned on in the morning I had 12.5 volts to one side of the relay but only 10.0 volts on the other (going to the GP's). After the relay shut off I had my kid cycle the key off for one minute, then back on. I swear I heard the relay click but zero volts on the GP side - triple checked grounds, nothing. Another key cycle and still no volts on the GP side, always 12.5 on the battery side. I buttoned everything up, tried to start it with no joy - just copious white smoke. I cycled the key again and it fired up perfectly normal, white smoke cleared quickly and runs perfectly. [B]GP's[/B] - I used the ohm meter to check the GP's at the UVCH connections. My information is that they should be between 0.5 and 2.0 ohm's (someone care to verify this?). The front, divers side pin showed 2.8 ohms and the rear two pins on the passenger side showed open connections. The other 5 showed between 0.5 and 1.0 ohms each. Just for background, I have never had the valve covers off in the 196K miles on the truck. Never needed to! :rockon: I know I need to replace all the GP's, it's time, no doubt. What do y'all think about the 10 volts and intermittent function of the relay? Normal or ??? I was always told that relays either work or don't but this one seems to be in the middle? Other thoughts on the white smoke, no start? TIA. :pint: [/QUOTE]