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1992 GMC Sonoma 4.3L Excessive Emissions, Poor Idle Quality, Misfire
Originally this vehicle would only run when the bypass line was unplugged, replaced dist shaft (OEM) because of cracked and weak magnet also replaced pick-up coil and module (After market), now it sets code 33, the manifold vacuum is very erratic between 13 an...
FIX posted 12/14/1998
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Message Closed w/FIX
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Related Documents & Media 
| VIN | 1GTCS1423N |
| Engine | 4.3 L / 6 cyl |
| Emissions | OBD1 |
| Symptoms | Excessive Emissions, Poor Idle Quality, Misfire |
| Occurs | Always |
Trouble Codes
| 33 | Erratic vacuum at MAP sensor. |
Message Closed w/FIX
Vehicle Data
1992 GMC Sonoma
| VIN | 1GTCS1423N |
| Engine | 4.3 L / 6 cyl |
| Emissions | OBD1 |
| Symptoms | Excessive Emissions, Poor Idle Quality, Misfire |
| Occurs | Always |
Trouble Codes
| 33 | Erratic vacuum at MAP sensor. |
Video