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We present an analysis of the 3-mm VLBA observations of the bl azar S5 0716+714 obtained in November 2003 during the broad-band observational campa ign which took place before the powerful optical flare in March 2004. These data are a part of a multifrequency VLBA monitoring of the object and cover the period before, during and after th outburst. In November 2003, the source was reported to display the inter-day variability at 3 mm as observed by 30-m IRAM telescope. We attempted to detect the IDV in both total flux an d polarization using the 3-mm VLBA data obtained close to the IRAM observing session. We pr esent a method for the total flux variation search within the interferometric data, test this method on the 8-hour 3-mm VLBA observation and discuss the results and problems of the usag e of the method. Also, we try to figure out what features should the VLBI experiment have to be suitable for the search for rapid variation of amplitude and what limitations are caused by th e technical reasons.

VLBI observations of blazar 0716+714 during the outburst in spring 2004