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Message: [QUOTE="early99powerstroke, post: 239413, member: 1262"] got an early 99 7.3 powerstroke 178k miles. started it up one day and after it started to warm up it started making a LOUD knocking sound. I installed a riffraff diesel FPRX fuel crossover and it quieted down alot, but the sound is still slightly there if I listen carefully. I also have small amount of blue smoke under heavy acceleration with my chip turned up. This is really worrying me.... I haven't done a compression check yet(but will be soon, kinda scared...) I did a contribution test and it passed (don't know how reliable a contribution test is). Any ideas to what is causing this? worn Injector O-rings, bad injector, worn piston rings, scarred cylinder wall? All ideas and theories are welcomed. I just want to track down this problem.... [/QUOTE]

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