When changing the glowplugs on my 2000 Excursion 7.3L PSD, is it better to warm up the engine before attempting to take out the old plugs? I was told that I could break the old plugs if I didn't warm up the engine first. Is that true?
???? shouldn't have plenum heater instead of glow plugs,will have a air inlet heater for after eng started but will still need to heat cylinders.I have a 2000 f550 with a 7.3 powerstroke.I was told I have a plenum heater rather than glowplugs.