2002 Toyota Sienna - high fuel trims on acccel (SOLVED)
I recently bought a used 2002 Toyota Sienna with 134k miles. I found out a day later that is smokes blue on cold morning starts (for about 5 seconds) - so it possibly has bad valve seals. It runs pretty well otherwise and doesn't smoke any other time. It also has a problem with high fuel trims during acceleration. During idle the fuel trims are pretty close to 0% -/+ 8%, but acceleration causes long term fuel trims to jump up to close to +25%. It doesn't seem like there's any fuel pump kind of problems, but I haven't done a fuel pressure test. MAF readings are good, no check engine lights, good engine temperature readings, IAT, etc. If I hold a steady speed 50mph+ on the highway for a bit, the +25ish fuel trims will randomly dip down towards +10-15ish for a bit, and then rise back up to +20-25 without any vehicle speed changes. Sometimes it will even go up to +30, but I haven't received a lean code yet since it hasn't hit 35+. The only other obvious issue besides the morning blue smoke is that the transmission is fairly worn and doesn't shift smoothly. The engine seems to rev or roar significantly louder when accelerating but the sound smooths out once speed is steady. My other 1MZ-FE engine (on my 99 Lexus ES300) is much quieter in this regard and doesn't have these high fuel trims. Should I worry, since the repair manual says this is within normal fuel trim limits? Should I suspect a fuel system related issue and investigate further? Can engine conditions such as bad valve seals cause high fuel trims like this?
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