Check the hose clips for tightness and examine the trunking for any cracks or splits and then all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best pretentiousness to locate a leak is to have the engine paperwork and warm and subsequently spray lighter gas /propane or brake cleaner in this area each joint in turn. If the engine rev s in the works you ve found your leak.
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Might furthermore be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can realize a quick irregularity find if you unplug the meter and govern the engine without it. if the engine condition is the same after that chances are the meter or the link to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can get coated taking into account dirt greater than become old which then offsets the reading. Use some retrieve cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account touch the wires similar to whatever as they are very fragile
This could be a large vacuum leak ,with the MAF joined it is lonesome measuring the air that is getting afterward the MAF, consequently if the intake manifold is sucking in freshen the expose to fuel ratio will be unquestionably out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. bearing in mind carb cleaner spray can spray in the area of the hissing with the engine organization and in imitation of you hear the engine stall or rev forward-thinking there is the leak ,could be a bad vacuum hose bad gasket on the manifold.
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