Help - 14 MPG to 11 MPG. Out of ideas :-/
Here is what is going on. I have a auto 2008 FJ with 137k miles, for the last 3 years I have been averaging 220 miles per tank. Last month I dropped to 190-200 after blowing a rear seals/bearings...or so I thought this was the cause.
while tearing down the rear I noted both rear calipers had pretty good grip on the rotors while removing them even though they were soaked in gear oil (I could also smell the gear oil burning when coming to a stop). Installed new rear bearings, seals, parking shoes, pads, and rotors. Then dialed in the parking brake cable which I regret not replacing as its fairly stretched out.
The end result is now 175 miles per tank.
Power feels about the same, though it feels like I do need more throttle input to maintain the same speed.
Here is some telemetry:
water temp 185-193f
Air intake temps average between 40-67f
Transmission fluid temp 140-155f
tires 36 psi
Washington state with 92 fuel
within the last 8k miles I have done:
rear end bearings brakes as mentioned above
front and rear gear oil
front wheel bearings
all new suspension parts (same ride height)
cleaned air filter (k&n, nearly no oil sprayed on it)
new battery group 31
other things to mention:
No engine codes
rear hub temps are sub 100 after stopping, rotor pad surface is 180ish, rotor hub is a little less (170ish but cant get a good reading through wheel), outside pad/caliper 200-220ish.
front are a little warmer, but not much.
oil changes between 3k/4k
transmission does have a bit of a whine when center console removed, and a little "chirp" on up shift when cold between 2k-3k rpm slight uphill.
I let my truck hit at minimum 120 water temp before rolling off
extended the factory battery cables with hydraulic crimper/solder to fit group 31 battery so this should be solid
replaced serpentine pulleys about a year ago
rear calipers pressed into bore very smoothly
no trouble starting cold or warm
Thinking of throwing a few new parts at it:
fuel pump? (starts fines, revs like a high compression 4.0, idles very smooth around 600)
and again this is very recent... my tires are the same, lift is the same. I don't think it is related to rear wheel bearing job... just a really good timing coincidence.
Any ideas would be appreciated
Thanks in advance.