Running rough on start, checked the glow plug relay and found that #4 is not working. How do you determine where #4 is? Do you just count 4 starting from the front of the engine? I haven't replaced glow plugs in years, and can't remember.

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85 300TDT 456,000 orig. miles

That's what you do.

#4 is no fun because it's partially blocked by the oil filter housing. Pick up a gearwrench for it.......or suffer the pain.