I am having a cold start problem. I checked the gpr and it is working fine. I pulled the connectors off of the valve covers and tried to check the terminals to the glow plugs and i get 0 ohms on 6 of them and .1 on two of them. First off, i am not that handy with a meter. :icon_rolleyes: But does this mean the glow plugs are bad? Also took the meter and did a continuity test from ground to the terminals in the valve cover and it appears they are all going to ground. It does not get very cold around here and the truck is not my daily driver. It has 149,000 on it and i am pretty sure the previous owners did not take great care of it. Thanks for any help.
How's the quality of your meter? Is it a digital one, or a cheapy? If the latter, you may not have enough accuracy. A good GP should show between 0.5 to 1.2 ohms, and a bad one will generally show infinite ohms (meaning an open circuit). I don't think they will fail by shorting out (showing zero ohms), but I could be wrong. If they did, though, I think that youwould burn out a fusible link from overcurrent.
The injector feed and return terminals should show infinite resistance when measured to ground, so either you're doing something wrong in measuring, or it wouldn't run because the injector circuits are shorted. The GP's are "self grounded" where they screw into the head, so the terminals there are only isolated from ground by the resistance of the GP element.