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Possible Injector O-Ring Problems?
I have a 2001 7.3L F350 that I use primarily to haul a 12,000lb 5th wheel with 140,000 miles on it. I brought it used two years ago and will put about 3,000 miles per year on it. It is stock, except for a straight pipe and the dieselsite IC boots. I just replaced all pads, rotors, calipers and brake lines. My mechanic said the old calipers were not hanging up.
Since I bought it, the power seems down. I have noticed that it struggles pulling up hills more than it used to. Also, the MPG has dropped from 15 to 9. Adding the dieselsite boots helped me hear the turbo more and seemed to give a little bit of a powerboost, but not as much as I would have liked. In November, I had it scanned and it passed both the buzz test and CCT test. I have been consuming oil at the rate of about 1 qt every 600-800 miles...no puddles, no smoke. From reading on here and talking to a few people, this would lead me to believe that my injector orings are bad, allowing the oil to mingle with the fuel and get burnt. When I changed my oil and fuel filter last month, the mechanic showed me the fuel filter (only 1 year old, ~3,000 miles on it) and it was black...more gritty than oily. He said it was probably bad fuel (but he is more of a gas mechanic than a diesel mechanic) So, my two questions....
First, will bad injector o-rings cause my symptoms (oil consumption, MPG drop & power loss) or should I look elsewhere?
Second, if o-rings are the culprit, what else should I consider doing while in there? I hope to order parts and take them to a mechanic (if I can find one in the Louisville, KY area). I am thinking I should replace the o-rings, glow plugs, valve over gasket, glow plug relay, UVC Harness as a preventative measure while I am in there. Anything else? Or should I wait until he is in there to decide what to replace (which means I might pay more locally for parts or he would have my truck longer)?
Thanks for your help!