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Old September 5th, 2019, 22:23
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paulhead paulhead is offline
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Join Date: Dec 2004
Location: where compton meets the water
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Re: Bad gas mileage 10-11 MPG

Originally Posted by ehall View Post
torque converter clutch not engaging will do it for sure, since without the clutch you are relying on hydraulics alone. if you feel like the trans is shifting weird I would probably start there.

check for fuel leaks / damp fuel lines (no kidding)

use the key trick to pull codes and see if anything there that didn't trip the CEL

are you running a 180 or 165 thermostat? the computer tries to get the engine temp to 195 by running a rich mixture so that the cat converter works efficiently, if temp stays low the computer will forever be dumping unnecessary fuel. O2 sensor can do it too but not usually that aggressive
No codes, pretty sure I'm running a 195 thermostat, it's running at operating temp.
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