Hi Gadgetfolk, 2 days ago I Grooved a '99 Ford F-350 Super Duty Triton V-10 6.8 Liter truck owned by a good freind. Wow is all I can say! Pre-groove LT fuel trims were in the +25 to +30 range, with 283 K miles on the Odometer. O2's were switching fast wide range. OK- I Grooved the double TB w/ large Grooves at revised angle by hand no jig. The Breather fitting on driver valve cover was an issue, the nipple was gone, the fitting is mounted with looks like some type epoxy/hard gray goo in the valve cover instead of a rubber grommet as I would expect (see pic).Tapped threads into the remains of the Breather fitting, installed a brass nipple to accomodate PCV re-route.
I loved Grooving this beast, what a simple TB to do- Cable actuated, only a TPS on the TB. Easy!
Challenge was balancing on my knees atop engine area to do the "hose" work:unsure: Result is a truck w/ lots more throttle response! I had owner do the drive part of computer re-learn, she soon was saying how little throttle was now needed as I sat in pass. seat.
Before LTFT's were +25 to +30, fell to 0 to +0.8! Before mileage was 8-12 MPG, awaiting results of her monitoring. O2's still switching OK, maybe slower.
Only glitch so far is a Code PO401 Insufficient EGR flow. Did checking found a thread on a Ford forum:
P0401 Code on a Ford V-10 - Ford Truck Enthusiasts Forums
Great thread lots of info including a youtube vid. on p2 of thread. This is all about the EGR System its sensors cleaning pipes/tubes and replacing the DPFE Sensor if required. TB and manifold plenum were grody/carboned up, might just be the EGR ports/tubes need cleaned, I'll be checking into that!
Anyhow owner is very happy all smiles 'bout her Groovy TritonV-10!
Pics: The Breather fitting/repair/mod, PCV port under TB mounting flange, "mod" w/ red vinyl cap on plastic hose fitting connecting PCV 3/8" hose to 3/4" U-hose connecting to PCV manifold vacuum Port. and the Grooved TB itself.
TracyG Gadgetman Reno