Quote:
Originally Posted by EsoBOFH
Let's try to keep this thread on track - we're discussing the idle issue, and the sudden drop in RPM.
... Now, after seeing the video on how D4-S works, my thinking is that the switch from combustion chamber injection, to intake injection is the culprit here - i.e. the change is overlapping, and so the ecu is cutting fuel so the rpm doesn't surge, or the change is too far apart, and there's a momentary lack of fuel as it switches over (and with the clutch pushed in, there's not the extra momentum of parts spinning...)
The above could definitely be caused by the camshaft being off, or if the exhaust valves timing is affected and the flow through the cylinders is interrupted going from high speed to low.
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I initially suspected an iacv/maf/air leak problem but EsoBOFH may have something there about the D-4S system switching from combustion chamber injection to intake port injection and vice versa.
Let's hope the Toyota engineers figure it out.