Posted by Kyle in Ky on October 10, 2017 at 04:35:53 from (31.215.72.195):
In Reply to: Question posted by Goose on October 09, 2017 at 19:00:07:
Is the truck suffering from the infamous shutter and stalling?
99-2002 model 5.3 trucks engines had issues with low RPM's (below 700) when started first start of the day or pulling up to stop sign/lights, the RPM would fall well below 700 RPM and the engine would shutter, sometimes stall. The defect wouldn't trip a CEL or set a code in the computer. Two things to check, remove the plastic plenum cover, looking at the engine, on the drivers side, mid-center of the intake is a fuel pressure regulator with a rubber vacuum hose connected to it. Remove the vacuum line and tap on your hand or surface to check for residual fuel coming from the vacuum line. If you have fuel present, the diaphragm in the regulator is bad which will cause low RPM or shuttering. Second way to check, connect a fuel pressure gauge to the shrader valve on the fuel line. Start the truck, make sure the pressure is above 45 PSI. Shut the truck off, if the fuel pressure gauge goes to zero, that indicates the regulator is bleeding off and not keeping a constant pressure across the injectors. Second cause is the idle control valve. It attaches to the throttle body on the left hand side. Its attached with two screws. The plastic bushing inside sometimes wears out which doesn't allow for a proper signal to the computer for pedal travel. If this is your problem, while you have the boot off the throttle body, clean the black crud out of the throttle body using cleaner and a rag. Make sure the air sensing ports in the throttle body are clear and not plugged with crud.
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