I have been working on my friends 99 PSD 130,000 miles. It hard starts every morning when cold, I know it's glow plug system related because it fires right up if plugged in.
I don't know PSD well but I knew from a quick look on here to check the GPR so I told my buddy and he just went and bought a new GPR, (napa#GPR110) put it on and it did not fix it
I assumed the worst and told him he needed glow plugs...long story short this is what I have checked and changed.
2.All 8 glow plugs
3.Cleaned all the Battery grounds
4.had the batteries load tested individually
5.Run a direct ground for the relay housing to the battery-post
with the key "on"
I have had about 11.87v+ at the relay constant. (big post)
I get about the same amount of volts at the small wire on the front most terminal. (PCM signal I'm guessing) Then on the other small terminal there is 0.50 volts for 2min's then it switches to the 11.87v. the relay only intermittently pulls in and powers the other big post(glow plugs) did I get a bad NEW relay??? I put the old stock relay back on and it worked the five times I cycled the key just like it was supposed to.
by this time I had run out off time to work today, but I told him to take it home and see if it would start in the morning. I am not completely convinced that it is fixed so I wanted to ask some of you guys input on this thing it's driving me nut's
BTW I did use the search first but I have not found the answers to all this stuff.
Thanks for your help in advance