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1992 GMC Sonoma 4.3L Poor Fuel Economy
Posted to GM Driveability on 1/7/2000

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...

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Message Closed w/FIX

car Vehicle Data

1992 GMC Sonoma

VIN 1GTCS19Z3N
Engine4.3 L / 6 cyl
SymptomsPoor Fuel Economy
OccursAlways
Message Closed w/FIX

car Vehicle Data

1992 GMC Sonoma

VIN 1GTCS19Z3N
Engine4.3 L / 6 cyl
SymptomsPoor Fuel Economy
OccursAlways