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Diesel shop says I need a new engine!!!
So, I am new to this forum and to diesels (except for the ones that we use to two aircraft). I recently bought a 7.3 2000 F-350 Dually with 335k miles on it (after talking to two of my buddies and doing extensive research and discovering that the mileage is nothing for this engine). So, the truck runs like a dream EXCEPT for the fact that if it sits for two days, I get a hard start. Also, when its cold, it idles like crap (smooths out when gas is pressed), and also it has a slight vibration at highway speeds (vibration is actually intermittent, almost like it cycles). Also, when it gets to less than 1/4 of a tank, it stumbles really bad.
Soo.....I check on this site and see all of this stuff about a CPS sensor. Called the dealer and they said it was already done. So, I take it to a diesel shop to get them to check the hard start and the vibration and they come back with I NEED A NEW ENGINE!!! They also tell me that I have 3 cylinders not firing, and I need new injectors, glow plugs, valve cover harness, heater relay, a few sensors, and some oil (oil is leaking from around dipstick tube housing and I already found the fix).
So, im thinking that diesels work a lot like turbine engines in aircraft (i work on aircraft for a living), and I also applied some common sense to this. If it was running on only 5 cylinders, wouldnt the truck run like sh*t? I just drove it like 300 miles on the highway and it ran awesome. Then he tells me that I have oil and fuel leaking from the passenger side cylinder and that its coming from the head gasket. Doesnt that mean the head gasket is blown? Wouldnt that make this truck run like sh*t? And finally, here's the kicker, he said that these engines are only good for about 300k miles and that mines is on its last leg.
Is he full of sh*t or what? Are my assumptions correct about the dead cylinders and the blown head gasket would make truck run like sh*t? He also said he got all this by running codes in computer, but the CEL was NOT on when I brought it in. If a diesel is anything like a gasser, the computer will only show old stored codes when the CEL is OFF, right? He also said that the injectors could not be rebuilt, and that there is more work to pulling injectors than glow plugs. I thought the injectors were right there under the valve covers and the work should be about the same, and not be more invasive.
Sorry for the long post but I am just baffled and dont know what I should believe. My original plan before taking it to this shop was to
1. Rebuild injectors
2. Replace valve cover harness
3. replace glow plugs
4. Do the fuel tank pickup mod
Anyone want to chime in on this?