2004 Silverado Electrical Schematic

This could be an airleak after the airflow meter, any freshen dragged in here isn t seen by the ECU and therefore not compensated for and can lean the engine out and can next permit the engine to rev taking place when not desired causing rasping running. As its a mechanical deformity it tends not to turn on the malfunction vivacious and you can sometimes hear a hissing noise taking into consideration the engine running.

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I started the car up this morning, it starts taking place and runs at 1750 and within a minute or therefore climbs higher than 2500.. It is doling out serene though, just artifice far ahead than it should be. I with checked the throttle screw plate/return screw, purposefully turned it out and nothing changed. put it help to exactly where it was. No vacuum leak sounds and every links verified. I air fine roughly them as I've been in there a bunch of times..

This could be a large vacuum leak ,with the MAF connected it is single-handedly measuring the air that is getting following the MAF, so if the intake manifold is sucking in ventilate the let breathe to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner spray spray in the area of the hissing similar to the engine dealing out and as soon as you hear the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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