Long time no post so here's an update! Took the truck to a shop here in Sacramento, Ken Imler's Performance Diesel. Very impressed with their knowledge of the older diesel light/med. duty trucks and fair not scamming for extra repairs etc..Ken has been there working day to day for over 25 years. Anyways this isn't really a business plug just letting you know who worked on it after me.. I had them time up the fuel pump. Said it was pretty far out of wack and advanced it as much as they could. Again the truck has always seemed to run smooth and strong but at least I know it's adjusted better now. They said I definitely need a new pump. AND that is probably the reason for hard cold starts. .. I'm still not sure why that is, if anyone here knows why...? He also fixed the FSS wiring and yea it was just buried in the loom and tied it back in properly.
I did put in a new set of glowplugs cuz they were testing a bit low and then did a test where I pulled one out and left it plugged into the wiring harness, then ran a ground wire to the threaded body of the gp. turned key on and switched on the gp system from inside the cab and had a buddy see if it glowed. He said yes it did get visibly red, so I'm assuming the relay and everything else is good.
In the meantime I have been using my block heater on a timer to basically keep the truck kinda warm over night (3hrs on and 4 off) it's been starting pretty normal in the mornings. Sometimes though it will start up quick and idle for about 3-5 seconds then die ...After that happens it takes forever to get the thing to fire up and I'm not sure why that is either? .. matter of fact a few days ago I couldn't get it to start at all and had to have it towed home from a friends house...
Is there any harm to never let the engine cool all the way off? other than wear and tear on the block heater element, which who knows how long it's been installed, whether it's the stock unit or was replaced along the way sometime. It makes an audible noise when it's on which is cool because I knew it was doing something when I plugged it in for the first time.