That injector trick I nearly ignored saved me 4 hours

Had a 6.7 Powerstroke in the shop last Wednesday. Rough idle, white smoke, the works. Figured it was a bad injector right away. Pulled the valve cover and saw the usual stuff. But instead of grabbing my tools to yank it out, I remembered this old tip from a guy I met at a parts counter in Tulsa. He said try running it with the harness unplugged one by one. Thought it was dumb but gave it a shot. Third injector from the front, the idle smoothed right out when I unplugged it. Turned out it was a loose connection at the harness, not a dead injector at all. Saved me pulling the whole fuel rail and buying a $400 part. Anyone else ever find a bad connection that acted just like a dead injector?

2 comments

2 Comments

finleyk8714d ago

Did you check if the loose connection might have been caused by a chafed wire rubbing on the valve cover gasket? That's a common spot where insulation wears through and creates intermittent faults that mimic injector failure. I've seen that exact scenario twice now on 6.7s and it'll drive you nuts until you find it.

michaela1613d ago

Buddy of mine had the same thing on his 6.0. He swore it was a dead injector too. Spent a whole Saturday pulling parts, only to find the wire had rubbed bare against the rocker cover. He was not happy about it.