Hi Folks,
I've swapped a 5.3L L59 flex fuel engine out of 2007 Silverado Classic into a 1993 Toyota Land Cruiser. Put a stage 1 Summit "Truck Cam" in it, and Hooker block hugger headers, but otherwise stock. No codes except an occasional P0300. Everything is present except for the fuel level sensor and the fuel composition sensor for the flex fuel stuff. Truck runs well - idle was rough so I bumped it about 50 rpm. I think I have the MAF dialed in pretty well according to the LTFT histogram. Haven't done anything else except turn off VATS, set the tire size (33") and rear end ratio (4.11) and turn off the flex fuel sensor and set the fuel composition sensor to "not fitted".
So, as I said, it's running well. But the fuel mileage is *terrible*. Like about 11-12 mpg around town, 15-16 hwy. Doesn't seem to matter much whether I baby it or beat on it. It's a 6000 pound full time 4WD truck, so I'm not expecting miracles. But other guys who've done this swap into these trucks are reporting 15-16 mpg around town and better hwy.
The primary reason I did this swap, instead of fixing the blown head gasket on the original I6, was to improve my range. I use the truck for back country off road trips and have been limited by how much fuel we can carry. But this is right back to where I started in that respect.
One immediate question - in the flex fuel section, there's a field labeled "Default Percentage" referring to the assumed alcohol % if the fuel composition sensor fails. This is set to 38%. It's 0 on stock tune files for non-flex trucks I've compared it to. Is this still used if I have the flex fuel control turned off? I'm going to load a tune with that set to 0 and see what happens.
Suggestions where to start/next steps? Brand new to this, so feeling my way along.
Thanks!
Here's the cam:
sum-8718_xl.jpg
And here's the latest tune & log. Maybe I should also note that this truck lives at about 7000 feet, and that's where the log was run.