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Vibration of a Kia Rio


Xtreme Auto
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Guys, my Kia Rio 2003 Auto is giving some troubles since few weeks. Biggest issue is vibration after starting when vehicle is not hot( specially morning and evening after off from office)just after starting it is vibrating and after transmit to D it takes few second and try to move but vehicle vibrating and can not accelerate in that time. But vehicle doesn't move as normal vehicle. It runs with a miss. In P it also cannot race. Also petrol smell is there near silencer. After 1-2 minute time it comes normal and moves nicely and no issue with pickup.

EFI tuning was done 1 month ago. Clean the petrol filter also.

Dear expert could please give your assumptions regarding this.

Edited by Xtreme Auto
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During a cold start IAC valve should open up to  rev up the engine. However if there is a vacuum leak t behind the throttle it can cause rough idle. BTW do you get a check engine light? The approach to test this issue is to close all vacuum  ports and do a cold start. If the issue still exists after closing the ports then you should check IAC valve. I suspect a leak from EVAP  ccontrol valve

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