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1999 Chevrolet Express 3500 7.4L Poor Idle Quality
This van came in with a surging idle. We can not get the codes to reset. It will intermittently idle down to 400 rpm and then idle up to 950 rpm. The o2 sensors will cycle from 65mv to 855 mv. It will also randomly miss on all cylinders with the counts never e...
FIX posted 11/6/2009
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Message Closed w/FIX
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Related Documents & Media | VIN | 1GBJG31J4X |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality |
| Occurs | Intermittently |
Trouble Codes
| P0171 | Fuel System Too Lean (Bank 1) |
| P0507 | Idle Speed Control System Higher Than Expected |
Message Closed w/FIX
Vehicle Data
1999 Chevrolet Express 3500
| VIN | 1GBJG31J4X |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | FI |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality |
| Occurs | Intermittently |
Trouble Codes
| P0171 | Fuel System Too Lean (Bank 1) |
| P0507 | Idle Speed Control System Higher Than Expected |
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