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1992 GMC Sonoma 4.3L Poor Fuel Economy
Hey guys this is a hard one. Here's the situation. Block learn memory goes to 108. Oxygen sensor stays rich. Hydrocarbon emmissions too high. Coolant temp, map sensor, and TPS checked out ok. Air/fuel mixture down (at 12.5 at idle). Vacuum readings at idle...
FIX posted 1/20/2000
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Message Closed w/FIX
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| VIN | 1GTCS19Z3N |
| Engine | 4.3 L / 6 cyl |
| Symptoms | Poor Fuel Economy |
| Occurs | Always |
Message Closed w/FIX
Vehicle Data
1992 GMC Sonoma
| VIN | 1GTCS19Z3N |
| Engine | 4.3 L / 6 cyl |
| Symptoms | Poor Fuel Economy |
| Occurs | Always |
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