Quote:
Originally Posted by t walgamuth
To avoid breaking off the tips (they fragile... not solid metal but a hollow tube with a coil spring inside) use penetrating oil liberally and be very careful backing them out. I'd remove the hard fuel lines to make it easy to get a straight shot at the flats on the plug. Then put in all new bosch plugs. There are reamers too to make the hole bigger but I have never used one.
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This is good advice.
And.... put in a full new set of Bosch glow plugs and give it a whirl. Chances are it'll fire up. If not, it's time to look elsewhere. Does it start in warmer weather? If it's 25F at night, during the day it's probably not cold enough for a block heater to really matter.