Eng fault code P0507
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Eng fault code P0507
We have a 1973 Nova w/ a 2002 5.3 Vortec out of a Chevrolet Tahoe. We have no EGR, it is blocked. We are running O2 sensors but no cat converters. The check engine lamp comes on intermitantly. When we connect the OBD reader it gives us the code P0507. The causes are excess engine idle speed, air intake leak, vacuum leak and idle are control valve. We have checked the intake gaskets w/ carb cleaner and no increase in engine idle, cleaned the throttle body. We have replaced the throttle body to manifold gasket and the idle air control valve. The car runs fine with the light on or off. It seems to come on under hard acceleration and then just letting the engine and speed come back down without any additional throttle input.
#2
Any luck figuring it out? I have an LS3 that does the same thing. I did the same attempts to narrow down the issue and have found nada. Mine will stall every once in a blue moon after the light comes on. Frustrating.