Why is my GM code 32 EGR not working?
Trouble Code 32 indicates that the Exhaust Gas Recirculation (EGR)valve diaphragm is not where the ECMexpects it to be. The ECM controls the diaphragm with a Pulse-Width Modulated (PWM) waveform. The EGR has a vacuum bleed solenoid that adjusts the vacuum applied to the EGR valve based on this pulse width.
What happens when the EGR valve gets stuck on a GM 4.3L?
This tutorial addresses a very common problem I’ve seen on the 1987-1995 GM 4.3L, 5.0L, and 5.7L engines with throttle body fuel injection system: a stuck open EGR valve. And when the EGR valve gets stuck open, it’ll cause a rough idle condition that may hard to diagnose.
What does the factory manual say about EGR?
From 1994 factory manual: PCM must be in closed loop, above 32 MPH, throttle position 10% to 25%, steady throttle with no more than 2% change, MAP reading above 47.5 kPa or below 15 kPa, maximum short term fuel trim less than 6 counts for 3.2 seconds, desired EGR command greater than 93%. In simple terms?
What does trouble code 32 mean on a GMC Sierra?
GM Code 32 EGR System. Trouble Code 32 indicates that the Exhaust Gas Recirculation (EGR) valve diaphragm is not where the ECM expects it to be.
What are the fault codes for the EGR valve?
EGR valve fault codes that light up the check engine light (CEL) on your instrument cluster. P0401 EGR System Flow Insufficient. P0403 EGR Solenoid Circuit. P0404 EGR System Performance. P0405 EGR Pintle Position Circuit Low Voltage. P1404 EGR Valve Stuck Open. P1406 EGR Valve Pintle Position. Rough idle.
This tutorial addresses a very common problem I’ve seen on the 1987-1995 GM 4.3L, 5.0L, and 5.7L engines with throttle body fuel injection system: a stuck open EGR valve. And when the EGR valve gets stuck open, it’ll cause a rough idle condition that may hard to diagnose.
How does the PCM open the EGR valve?
On throttle application, the EGR valve will be commanded open by the PCM as needed. The PCM waits for many conditions to be met before running the EGR test.
How can I tell if my EGR is bad?
Snapping the throttle should show some activity on the gauge as the solenoid briefly commands the EGR open. With the meter set on ohms, you can test the EGR solenoid coil across the two pins in the socket; any reading less than 20 ohms indicates a bad solenoid winding.