What causes -30% long term fuel trim
-30% long term fuel trim, close to 0% short term fuel trim on an 05 tundra 4.7. Recently purchased. It appears to get fairly regular mpg. What are possible causes? 217k miles and 2wd.
Since Recently purchased I have replaced spark plugs, air filter (oem has more pleats! And similarly priced), pcv valve (just one?), and will do the timing kit soon. All oem (or aisin) parts
I would like to think I'll keep it until around 500k miles
Clean the MAF sensor and throttle body.