Quote:
Originally Posted by OwlDance
Harmless noise. It seems like every FA20 does this. Boils down to either the direct injectors or valvetrain noise or the high pressure fuel pump (the latter of which doesn't make sense to me as this noise only comes on several minutes *after* start up but it's what Toyota told me after I took my new, 1600 mile car in for this very non-issue.)
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That is because the DI/PI injection ratios change as the car warms up. You are getting more direct injection, and less port so the high pressure pump starts making more noise.