When i start my 87 300 TDT first thing in morning i have noticed that if i turn the key and let the glowplug light go out, turn the key back to off and then repeat the glow, and then start the engine after the double glow, it will run a lot smoother right off the bat, almost perfect immediately, and idle quiets to perfect within a 2-3 seconds.

if i start the car right after the glow plug light goes out the first time, without repeating, the idle is much rougher for about 10 seconds, then it cleans up.

i have not tested the glow plugs yet, but does this empirical evidence mean i need to replace glow plugs?

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punkinfair