Im working on one of my dads companys truck, its a 2002 chevy. after i did the injectors the foreman wrecked it, idk how long he drove unill he stopped, truck got fixed and not 4 weeks later i had to pull the truck in cause crankcase got filled, drained 6 gallons and sent oil off to blackstone labs and they said it was fuel in the oil.
i just changed the injectors <3,000 miles ago with bosch oem's and all new seals and gaskets. i have efi and checked the balence rates, they were all good (highest one being less than 2)
question is, could a injector be cracked while the balence rates are good? and could it leak fuel in by the off chance a head is wraped/cracked? could anything else cause it? and finally is there a test i can do to find out.
i almost forgot, the truck had 0-10 oil psi and was driven roughly 100 miles in this condition(roofers are pretty stuiped, common sense doesnt apply to them i guess), blackstone labs said sense the oil was so diluted, they coulnd give an accurate measure of engine wear, what do you guys think driving it that long like that would do?
your balance rates wont show a crack, i almost positive
either way fuel in the oil is bad and costs lots of $$$ if left as is.
Pull the valve covers and see if all the fuel lines are properly tightened down
there's also dye you can use with a black light to trace the leak, unless it is an injector body crack, which the light wont show from it being buried in the motor.
I torqued all return lines to 18 pounds when I changed the injectors, but sounds like I'm getting into valve covers either way lol. Is there any way to narrow it down to one side, like return rates? Also, why don't cracked injectors show up?
Thanks for the quick and informative reply
I thought I heard you can do a vacuum test on the return line to see if they leak? I wonder if that's something you can do without removing the covers? Btw, I'm not making excuses to not pull the covers, I did several injectors, HG. Lol, I'm not scared, just trying to learn more.
Now that you mention it, I think you can. Hopefully someone else can chime in and answer. Or pm duratitus, he's the injector guru on here for the lb7. He s a vendor that sells them also if you ever new another set.
I would dump the old oil and refill with fresh and check that oil pressure before really looking into the injector issue......0-10 psi for that distance couldn't have been good........might not have to look at that fuel issue at all?
I would run it with the valve covers off and use dye and look for leaks. I had return lines leaking
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