sound really loud?...I'm talking clearly above the normal engine noise. Sound as though it's at the front of the engine??? It was initially soft but above the normal engine sound...Now..WOW...it's loud. Like someone hitting the block with a ball peen hammer. I should mention that I have at least one bad glow plug. I wonder if operating with a bad glow plug could lead to injector problems???

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83 300sd, 280K Blue/Blue Leather (~24mpg)
95 E300D, 150K Champaigne/Parchment(~33mpg)