stealth, valve tappets are the ones adjusted by the mechanic during a "tune up". you need to adjust that according to your manufacturer's recommendations in order to have a good running car. if its too tight, your car wont have enough power to run smoothly and the car will have hard starting; if its too loose, you will be able to hear your engine make a "taktaktak..." sound the whole time you engine is turned on and you will also have difficulty making your car run smootly. just bring your car to your suking mechanic and have your car tuned up, its the basic thing that they do during this procedure.
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