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Injector Stuck Open?

24996 Views 8 Replies 3 Participants Last post by  greenskeeper
I have a 2002 F250 7.3. Yesterday I was driving away from a stop sign, softly accelerating, and all of a sudden a crap load of smoke started billowing out the tailpipe and a knocking sound started on the top end on the passenger side. My injectors have been going bad for a while, I just haven't had the funds to replace all of them. I don't think it's a valve because it's all diesel smoke and crank case pressure is normal, it doesn't putt putt at all, oil pressure is normal, and the knocking sound doesn't always occur if I let it sit for a few minutes and then restart it, but after running for a few seconds it starts again. I had my ICP sensor come loose and leak out 2 1/2 gallons of oil and shut the truck off, so the injectors might have heated up from lack of oil. Is this most likely an injector or something more serious?
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sticking injector is a possibility or something mechanically wrong with a cylinder or two.

my steps going forward would be to remove the valve covers and check for oil at each injector spout. Then one at a time disconnect the pigtail to each injector and see if the smoking/knocking stops, if so you've found the bad hole.
The smoking is "reduced" when #8 is unplugged, but it's still smoking a ton.

When the truck is at operating temperature does smoke stop? Reduce significantly?

Might want to do a compression test before installing new injectors. How much blow by out the oil cap? Will the cap rest on the filler neck or get blow off?
If it was my truck I'd do a compression test first to see the condition of the engine with 300k miles on it. If all checks out then I would replace the injectors.
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