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BK 7/26/2010
1987 GMC R2500 Sierra Classic 8 Cyl 5.7L - Engine
how many oxygen sensors are in a 1987 gmc
1 Answer
  • Bobby
    Bobby 7/26/2010
    Back then it may not of had any oxygen sensor, oxygen sensors were equiped with trucks that had an ECM installed. But not all trucks were made with them yet. On the V8 the sensors were installed into the exhaust manifolds. Also back then they only used one they did not use the second to monitor cat efficiency yet it was only used to adjust air fuel mixture. But check the exhaust manifolds there was either only1 on one side or they put one in both but i'm pretty sure there was only 1

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