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Injector Stuck Open?

24996 Views 8 Replies 3 Participants Last post by  greenskeeper, 
isaiahfronning
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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greenskeeper
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.
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greenskeeper
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?
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greenskeeper
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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