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The
Things I've tried this am:
first turbo that was running fine then not. It's got some carbon build up but no so much that it's going to stop running. The action on the actuator moves freely you can hear the air suction of the oil. one I sub in was just cleaned and rebuilt. Don't think it's the turbo vanes
the vgt solenoids I used test 3.8, 3.8, 4.1 ohms. That's in the good range. Guess all 3 could be bad but seems fine.
brand new ebp sensor. Same readings as all the others. And I dropped the down pipe off back of the turbo. Ebp still off the charts wot - 2000 rpms sitting still. Either the pcm us screwed or the problem is in turbo airflow creating ebp to be high
did pull the egr valve. Didn't test it but carbon isn't completely awful. Not caked on.
scoped the intercooler. Oily as you may well imagine but no shop rags or towels in there. lol (never know).
getting to where maybe it's time time to try another pcm.
Last edited by Craig Maffet; May 19, 2026 at 08:27 AM.
Hey bismic - just want to thank you for all the info you provide. You giving inspiration and information at same time. Let ya know what happens w that hydro lock - getting on it next.
because of your willingness to help, I been lending hand on 7.3s where I'm a bit more familiar other venues. Just paying it forward.
anyway, my plus at vgt and at the ebp were skinned one wire each right behind pigtail. New pigtails both. Noticed when u was looking at the 1 month old vgt the base of the valve was visible like it backed out. Removed bracket pushed on it and it pushed itself out. This same vgt was in the other turbo when it went bad. So I pulled it out - it's springs fine, looks brand spanking new still. The spring end was cocked a tad - just enough it was viably askew. Put an old old vgt in it and boom. She worked. I didn't take it out or even jam the pedal yet bc so much to tighten down but ebp dropped from 18-20 to 16-17 immediately.
morale of the story kids. New parts don't mean good parts.
Thanks for the kind words. Glad to help however possible, and my compliments to you on your troubleshooting. Sometimes this old engine platform can get difficult, and turbo problems are probably my weakest area.
Thanks for the kind words. Glad to help however possible, and my compliments to you on your troubleshooting. Sometimes this old engine platform can get difficult, and turbo problems are probably my weakest area.
and it was deceptive bc I tried that same vgt before to no avail. It wasn't the first time. Pretty sure when I swapped turbos the old one was still in there didn't work so u swapped the vgts. Obviously the vgt is not good. The cap can't **** a hair without pushing in on the actuator. Possible those pigtails are also part of the issue as well. Certainly didn't help.
what I didn't realize until today. If you ohm check check the vref against the return signal wire on the ebp-egr-ipc-eot-ect-mat network, every one will report Back a different ohm number. Guess has to do w frequency and wave length something like that.
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