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  1. Chevy Silverado Forum (GMC Sierra)
    Working on 2001 GMC Sierra 2500hd with 6.0 gas engine and 351k miles. It’s throwing a p0200 and p0300 codes and showing open loop on banks 1 and 2. I’ve replaced the injectors, injector plugs, catalytic converters, o2 sensors, tested the injectors with node light, and tested MAS. Truck has no...
  2. Chevy Suburban Forum (GMC Yukon XL)
    Please Please Help.. 1999 Suburban K1500 LT 5.7 Vortec with the newer Spider style. Completely Stock other than added a second battery with a relay. Background: Fresh Rebuild after previous head gasket and 2 cracked heads. Issue: P0134 P0154 and seem to be in Open Loop all the time...
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