2002 kia spectra motor vibration whats the cause on 2002 Kia Spectra

my 2002 kia spectra has a vibration from the engine only when its in drive and idiling when shifted to neutral or park its ok it is very noticable when the AC or cooling fan comes on i have new motor supports all around and a tune up have tried everything one thing i have noticed is the rpm guage is below 1 when idiling a service tech adjusted the idlier screw higher and the car will not run properly he had to return to original position there is no diagnostic code showing up for this problem what can be done to fix this

by in Sparta, TN on November 23, 2010
1 answer
ANSWER by on November 23, 2010
Have you had the Kia for long? If yes, has the concern gotten worse over time? If you have had the vehicle a while and have noticed things deteriorating, you may want to check with a dealership first off that may have technical information related to excessive vibration. I know with other manufacturers, they have upgraded braces and mounts that help dampen the vibration on small 4 cylinder engines, that typically have a lot of harsh idle. It would be worth looking into. There could also be an upgraded computer calibration that may minimize your vibration. If you just got the vehicle and it has always been this rough -- it may very well be normal, or be a result of normal wear and use of the engine. Always verify to make sure you have good quality plugs, wires, secondary ignition components. Use good fuel, make sure the throttle body is clean and there are no air intake leaks or vacuum leaks.

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