P0404 Diagnostic Trouble Code Discussion for March 2004
EGR Position Sensor Performance
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| Help Request | Posted | |
| 2001 Chevrolet Blazer LS 4.3L Surge, MIL Lamp on VIN: 1GNDT13W11 P0404: EGR Open Position Performance. ... 48 mph half throttle 2nd gear under load monitored data in graphing mode while vehicle is surging here is what I observed EGR bounces from .90v(closed) to 4.40v (wide open) MAF varies slightly O2 sensors are switching normaly fuel pressure stays rock solid... |
March 09, 2004 | |
| 2001 Chevrolet Blazer LS 4.3L Surge, MIL Lamp on VIN: 1GNDT13W11 P0404: EGR Open Position Performance. ... 48 mph half throttle 2nd gear under load monitored data in graphing mode while vehicle is surging here is what I observed EGR bounces from .90v(closed) to 4.40v (wide open) MAF varies slightly O2 sensors are switching normaly fuel pressure stays rock solid... |
March 16, 2004 | |
| 2000 Chevrolet Tahoe LT 5.3L MIL Lamp on VIN: 1GNEK13T2Y P0404: EGR Open Position Performance. This Tahoe is driving us crazy. Customer complaint of check engine light on, no driveability problem. Replace egr valve with oem valve, light returned that same day. The same 2 codes keep returning. Are they related? Spent some time today checking grounds and ... |
March 22, 2004 |
