spetch
Full Member
While changing my spark plugs, I found that a little plug was disconnected and hanging free. It plugs into the bottom of the coolant reservoir, and the wires trace back into the MAF sensor wiring harness. I plugged it back in. Anybody know what this sensor is? Is a coolant level sensor? Temperature sensor?
Anyway, I've been trying to find the cause of a sudden poor gas mileage issue. I have a 2004 4x4 5.3L. I'm getting 10 mpg, where I was getting 14. It happened after I did an engine flush, dropped the pan, and removed a bunch of sludge from the bottom. The sludge was from an old coolant leak due to a cracked head. There is no CEL, and the fuel trims look okay based on watching them on my Bluetooth OBD2 scanner. I changed the oil and filter twice since then, replaced the spark plugs with new Iridium ones, changed Bank 1 and Bank 2 O2 sensors #1 (upstream), cleaned and oiled my Spectre conical air filter, and cleaned the MAF with MAF cleaner. I wonder if this little coolant sensor was important to the fuel mixture calculations.
Anyway, I've been trying to find the cause of a sudden poor gas mileage issue. I have a 2004 4x4 5.3L. I'm getting 10 mpg, where I was getting 14. It happened after I did an engine flush, dropped the pan, and removed a bunch of sludge from the bottom. The sludge was from an old coolant leak due to a cracked head. There is no CEL, and the fuel trims look okay based on watching them on my Bluetooth OBD2 scanner. I changed the oil and filter twice since then, replaced the spark plugs with new Iridium ones, changed Bank 1 and Bank 2 O2 sensors #1 (upstream), cleaned and oiled my Spectre conical air filter, and cleaned the MAF with MAF cleaner. I wonder if this little coolant sensor was important to the fuel mixture calculations.