92 M998 6.2 hard to start

[NormB]

Hey everyone. Finally got around to messing with this humvee and it hasnt turned out good at all.I got 7 of the old glow plugs out and ohm checked each one. all 7 were showing OL. The 8th one i could not get out and was afraid i was going to break it. I ordered a set of plugs from hummerpartsguy and double checked they were 24v plugs. Got 7 of them installed yesterday(16th) truck started great. Engine didnt even turn over twice before it started. Today(17th) i come in and try to start it. Now its back to its old ways. Taking about 15-20 seconds to start. WTS light comes on as well. So i decided to pull a plug out and test it to see if it was okay. I can NOT get any of these plugs out now. They are extremely tight even after all the threads are out of the head. I ohm tested them again from tip to threads and so far two of them show OL again. It looks like this thing is burning up plugs and i have no clue why and now im not sure how im going to get these out without breaking them.

There IS a note in a TM somewhere about removing these, using some OIL on the plug (get it backed out and squirt some in the precombustion chamber liberally slathering the tip of the plug).I removed ONE by using a small vise-grip pliers just between the nut/thread and tapping a tapered drift between it and the head.THEN I got underneath with a Titanium crowbar and applied a little more linear force a little at a time until it came out intact.Tip was VERY bent/crooked.Engine cranks now in 1-2 turns, FAST, no white smoke.Will replace the box (PCB) when weather's nicer. Maybe tomorrow or Saturday.

 

[1 Patriot-of-many]

Sounds like you need a new box.