Car (or truck or mini-van) seems to run OK above 30 miles and hour but once you come to an idle, the engine barely stays running.Lack of power as you accelerate the vehicle down the road.P0405 EGR Position Sensor Circuit Low Voltage.Check engine light (CEL) will be shining nice and bright.OK, whether the EGR valve itself is bad or the passages are clogged with carbon, this is what you'll usually see: This design (either by intent or incompetence on the part of GM -after all, Ford and other makes don't have this problem) has made auto repair shops tons and tons of money (before someone sues me, let me tell you that this is just my opinion). The most common problem is the EGR passages inside the intake manifold's plenum getting clocked with carbon. I'm not saying they don't go bad (they do), but it's rare. I can tell you from experience that a bad EGR valve is rare. You can find this tutorial in Spanish here: Cómo Probar La Válvula EGR Electrónica (3.1L, 3.4L GM) (at: ). TEST 7: Intake Manifold Blocked With Carbon.TEST 6: Testing The EGR Pintle Solenoid.TEST 5: EGR Pintle Position Sensor Ground Circuit.TEST 4: EGR Pintle Position Sensor 5 Volt Reference Circuit.TEST 3: EGR Pintle Position Sensor (Road Test).TEST 2: EGR Pintle Position Sensor Test.TEST 1: Is The Intake Manifold Clogged?.Circuit Descriptions Of The GM EGR Valve.
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