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Old March 11th, 2009, 02:15 PM   #6
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The only drawback with the 6.9 is they had a failure prone glowplug system that liked to stick on and burn up glowplugs, Alot of people wire it up to a push button or convert it to the 88-93 7.3 solid state system. Other than that they are trouble free and unlike the 7.3 IDI are not prone to cavatition.
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