Compression Ignition Addict
Join Date: Mar 2012
Location: casar n.c.
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just a few possibilitys here...since the problem is come and go, i would rule out rings, valves, or valve springs. Smoke and skip at idle sounds like to much fuel on one or more cylinders (no. 7 most likely since it failed contribution). If its fuel it should be a greyish black color...oil would be blueish grey. Injectors don't usually come and go...they may skip at idle and smooth out as revs increase but once they start skipping they don't stop. I would guess either injector driver module or wiring on no. 7. One way to rule out a few things is to swap injectors from a cylinder that passes contribution to no.7 and re-run the test. If no. 7 is still dead, it has to be in the wiring or electronics. Hope that helps. Also, if it starts skipping again...use a mechanics stethoscope or stick or vaccum hose to find which bank the skip is on...pull that valve cover and unhook each injector one at a time until you find the one that makes no difference in idle quality...now you know which cylinder is down for sure and you can diagnose from there. If you can borrow an IDM from a good running truck that would rule it out as well.
Psalm 34:6 "This poor man cried, and the Lord heard him, and saved him out of all his trouble."
94.5 psd, 310,000,
ts chip, homemade cai,
3in dp 5in exhaust, 265/75/16 tires,
zf5, fpr shim, bench seat so my honey can get close! SOLD!
98.5 psd, 245,000, new a/t, banks gauges, 06 interior, 4 inch exhaust 5 inch tip, the truck is red
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2004 F-250 6.0 4wd, auto...and get this, 356,000miles on og engine/trans! Stock for now...