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Message: <blockquote data-quote="Temujin" data-source="post: 4443413" data-attributes="member: 6472">Perhaps the culprit is the BOV?What do u mean by complete tune up? My previous 180SX with a BOV as well as my current car had similar problems during high rpm shifting due to the car and the mass airflow sensor was not tuned to the BOV..Quoting from http://www.answers.com/topic/blowoff-valve,In the case where a mass airflow sensor is used and must be located prior to the blowoff valve, the engine control unit (ECU) will meter out excess fuel because the atmospherically vented air is not subtracted from the intake charge measurements. The engine then briefly operates with a fuel-rich mixture after each valve actuation.The rich mixing can lead to hesitation or even stalling of the engine when the throttle is closed, a situation that worsens with higher boost pressures. Occasional events of this type may be only a nuisance, but frequent events can eventually foul the spark plugs and destroy the catalytic converter, as the inefficiently combusted fuel produces soot (excess carbon) and unburned fuel in the exhaust flow can produce soot in the converter and drive the converter beyond its normal operating temperature range.So unless u did a 'complete tune up' that would at least include a piggyback then my best bet would be the BOV. I got myself a standalone for both my ex-180sx as well as the current car, and the problem ceases after tuning and replacing the MAF with the MAP sensor (manifold absolute pressure).. Another solution to this is to recirculate the air back to ur intake piping, but at the expense of the typical BOV kapishh sound..Hope this helps..</blockquote>

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